Predicting acceptance and adoption of renewable energy community solutions: the prosumer psychology

Background: This paper, in the frame of social acceptance of renewable energies and innovative community-based production and consumption models, aims at supporting a data-driven approach able to deal with climate change and identify and quantify the psycho-sociological dimensions and factors that could support the transition from a technology-driven approach to a consumer-driven approach throughout the emerging “ prosumer business models”. In addition to the already existing Social Acceptance dimensions, this paper tries to identify a purely individual psychological fourth dimension to understand the processes and factors that underlie individual acceptance and adoption of new renewable energy business models, with the realization of a Prosumer Acceptance Index. Methods: Questionnaire data collection has been performed throughout an online survey platform, combining standardized and ad-hoc questions adapted for the research purposes, based on the developed theoretical model. To identify the main factors (individual/social) influencing the relation with renewable energy technology adoption, a Factorial Analysis has been conducted to identify the latent variables that are related to each other. Linear regression has been conducted to identify and quantify the factors that could better predict behavioural intention to become a prosumer. Results: Five latent psychological factors were revealed: concern about environmental issues, interest in energy sharing, concern on climate change, social influence and impact on bill cost. Three variables were found to significantly measure and predict the scores of the “Acceptance in becoming a prosumer” ad hoc scale: attitude, economic incentive and age. Conclusions: This research can facilitate policymakers and stakeholders to better understand which relevant psycho-sociological factors are intervening in the renewable energy technology acceptance processes and what and how specifically target when proposing change towards sustainable energy production and consumption.


Introduction
Change renewable energy business model?Climate change is considered by Europeans as the single most severe problem facing the world (Eurobarometer, 2021).To mitigate climate change, it is crucial to transit from fossil to renewable energy sources (EU Climate Pact, 2020;Liu et al., 2020).The success of such transition strongly depends also on efficiency and effectiveness in the adoption of renewable energy business models in local and national communities (de Coninck et al., 2018;Devine-Wright, 2007;Devine-Wright, 2009;Liu et al., 2020;Papazu, 2017;Wustenhagen et al., 2007).Renewable energy communities are going to be a reality in Europe soon, pushed by the recent Clean Energy Directive approved in late 2019.This directive obliges Member States to ensure a more competitive, customer-centred, flexible, and non-discriminatory EU electricity market with market-based supply prices.It strengthens existing customer rights, introduces new ones, and provides a framework for energy communities of prosumers.Currently, Member States are working on the transposition of the Directive into national regulations.Public acceptance of renewable energy and "renewable energy communities" is of increasing concern to policymakers in many countries, who aim to mitigate climate change by rapidly and extensively increasing the deployment of renewable energy technologies (Devine-Wright, 2011).Several policymakers are increasing their commitment towards sustainability and several Research and Innovation projects are purposely focusing on direct consumers' engagement in the energy transition.Different business models for sustainable community energy production and consumption can be identified, and amongst them, RENAISSANCE identified a set that we can call "Prosumer business models" (RENAISSANCE, 2020).

Prosumer business models
The Prosumer term, a combination of "producer" and "consumer", was first credited to Alvin Toffler in The Third Wave (Stewart, 2014;Toffler, 1980).After the Modernist culture of production, and Postmodernist culture of consumption, today the aware, active, and technologically engaged prosumer is on the rise (Comor, 2011) and it is challenging the consumer society's division of consumers and producers (Tobiassen, 2008).This research, to define the prosumer, apply the working definition from von Hippel (1986): "what distinguishes prosumers is their advanced technological skills and that they use these skills to produce as well as consume".Specifically, the term prosumer here will be used in relation to new renewable energy business models.But how is it possible to facilitate the generation and acceptance of prosumer models in a society, in order to facilitate business models for sustainable energy production and consumption?The acceptance and adoption of renewable energy technology (RET) models from individuals, members of specific communities intended in becoming prosumers, relies on two main pillars: social acceptance and individual acceptance.
Achieve a prosumer community: path to social acceptance Many researchers have argued that social and culturally relevant issues are critical barriers to RETs (Claudy et al., 2010;Sovacool, 2009a;Sovacool, 2009b;Zoellner et al., 2008).Carlman (1984) was the first scholar that defined the problem of social acceptance (for wind power) and stated that siting wind turbines were ''also a matter of public, political, and regulatory acceptance'' (Carlman, 1984).The concept of Social Acceptance of renewable energy innovation was formalized by Wustenhagen et al. (2007), presenting three dimensions of the concept (Figure 1).
Socio-political acceptance: on the broadest, most general level (Wustenhagen et al., 2007).Both policies (e.g., ecological tax reform, European Clean Energy Directive, 2019) and technologies represent successful cases of societal acceptance.
Community Acceptance: refers to the specific acceptance of siting decisions and renewable energy projects by local stakeholders, particularly residents and local authorities ( Wustenhagen et al., 2007).A particular feature is that it has a time dimension.As Wolsink (2007) demonstrates, the typical pattern of local acceptance follows a U-curve, going from high acceptance to (relatively) low acceptance during the siting phase (usually still positive on average) and back up to a higher level of acceptance once a project is up and running.
Market Acceptance: the process of market adoption of an innovation (Wustenhagen et al., 2007).Consumers have changed, becoming investors in distributed energy.The ownership of renewable energy devices, such as solar panels, becomes a question (Zhai & Williams, 2012).In this perspective, we can learn from the literature on diffusion of innovation (Rogers, 1995), which explains the adoption of innovative products by consumers through a communication process between individual adopters and their environment.

The specificity of RETs
The number of RETs features imply the existence of diversified sets of barriers to their Social Acceptance.For instance, renewable energy plants tend to be smaller scale than conventional power plants, increasing the number of siting decisions that need to be taken (Wustenhagen et al., 2007) becoming an individual investment decision.Furthermore, renewable energy conversion tends to be characterized by lower energy densities while the relative visual impact tends to be higher (Wustenhagen et al., 2007).This is in part reinforced by the fact that resource extraction of fossil or nuclear energy happens below the earth's surface (Sieferle, 1982) and is invisible for the everyday life of a citizen.At last, most RETs do not compete with actual technologies making their acceptance a choice between short-term costs and long-term benefits (Wustenhagen et al., 2007).The need to take more micro-level siting decisions impacts -among other issues -the need to preserve the aesthetic dimension, the sense of ownership of the local area, the need for security, and economic investment uncertainties.To avoid getting to the situation where people hinder the adoption of RETs, known as Not in my backyard (NIMBY), where residents oppose to proposed developments in their local area supporting strict land-use regulations, a consumer-driven approach to socially accept RETs implies community and group understanding to result in its activation.As Wustenhagen et al. (2007) noted, once more, RET acceptance is a collective action problem, also known as a social dilemma, which is a choice between short-term costs and long-term benefits.
For these reasons, to achieve the understanding of a prosumer community it could be relevant to add a fourth dimension (Figure 2) which includes all individual cognitive, affective, and motivational factors, that can help explain people's decision-making process in adopting renewable energy technologies.In psycho-social literature, a certain number of communities' and groups' factors have been found to have an influence on the individual community member.
Social norms are formed in group situations and subsequently serve as standards for the individual's perception and judgment (Sherif & Sherif, 1953).Norms not only detail what is appropriate behavior, but the expectations define what the group does, and who the group is.Deviation from social norms leads to engender conformity (Festinger, 1950).This tendency to conform is a consequence of Social Influence, or as the process wherein one person's attitudes, cognitions, or behaviors are changed through the doings of another (Cialdini & Griskevicius, 2010).A Nation interested in spreading sustainable and positive behaviors would want to share with its citizens' values and norms on global and environmental issues.That feeling of being part of the same group, and sharing those behaviors and values, generally, bring individuals to help each other and to cooperate for common objectives.Cooperation is a behavior part of a range of behaviors identified as Prosocial Behaviours, which are often associated with morality (Baron, 1997;Batson et al., 2002;Staub, 1978); this includes several behaviors such as helping, sharing and cooperating (Batson, 1998).According to Cialdini (1991), individuals may act prosocially to benefit others or themselves.Finally, a series of other factors, like national identity, can influence RETs' acceptance.National identity, as a person's identity or sense of belonging to one state or one nation (Ashmore et al., 2001), is not an inborn trait and is essentially socially constructed (Anderson, 1991).People incorporate national identity into their personal identities by adopting beliefs, values, assumptions, and expectations, if personally meaningful, translating them into daily practices (Ashmore et al., 2001;Bar-Tal & Staub, 1997;Hogg & Reid, 2006).

Individual acceptance: what does psychology say about prosumers?
To understand the way individual factors can explain who the prosumer is and how they behave, fundamental is to introduce a set of behaviors known in the field of sustainable energies and environmental issues as pro-environmental behaviors (PEBs).When defined by its intent, PEB is a behavior undertaken with the intention to change the environment from the actor's standpoint (Huang, 2016;Stern, 2000).However, how the behavioral intention to adopt a prosumer model can be described?While the majority of benefits are for the environment and society as a whole, PEBs frequently imply personal costs.Value has been identified as a significant antecedent of PEBs (Abrahamse & Steg, 2013;Nordlund & Garvill, 2002;Steg et al., 2009;Steg et al., 2015).It has been demonstrated that biospheric values (caring about the preservation of the natural world) are particularly crucial (Steg & De Groot, 2012;Steg et al., 2014b).Biospheric values are highly and positively correlated with PEBs when compared to other values (Nordlund & Garvill, 2002;Steg et al., 2011;Steg et al., 2014a).Being aware of global climate change may motivate people to act ecologically friendly behaviours, even when relatively expensive (Loebnitz & Aschemann-Witzel, 2016;Steg, 2016;Steg et al., 2014a;Verplanken & Holland, 2002).However, it is unclear if these values could also serve as the driver motivation to become a prosumer.Environmental self-identity (van der Werff et al., 2013b) is another variable that could help to explain the connection between biospheric values and PEBs.It measures how much individuals believe themselves as someone who acts in a sustainable way (van der Werff et al., 2013a), and in order to be or look consistent, people are compelled to act in accordance with how they perceive themselves (Bem, 1972).In fact, stronger the self-identity to protect the environment, stronger is the tendence to recycle (Mannetti et al., 2004;Whitmarsh & O'Neill, 2010), participate in environmental activism (Fielding et al., 2008), use fuel-efficient vehicles and sustainable modes of transportation (van der Werff et al., 2013b), plan to eat less meat (van der Werff et al., 2013b), and prefer environmentally friendly products (Barbarossa & De Pelsmacker, 2016;van der Werff et al., 2014) How to support social and individual acceptance to support Prosumer?In order to combine social and individual acceptance on the behavioral intention of becoming a prosumer, different psychological theories can be applied.A consolidated starting point can be considered the Theory of Planned Behaviour (TPB; Ajzen, 1991) which assesses someone's behavioral intention to engage a specific behavior (adopting a RET) is influenced by subject's attitudes; personal norms; and perceived behavioral control (Ajzen, 1991).While TPB could explain the intention of becoming a prosumer, it couldn't fully explain people's attitudes and perceived behavioral control in accepting new technological business models such as RETs.Davis's technology acceptance model (TAM;Davis, 1989;Davis et al., 1989) included the technological aspects in the TPB framework.TAM shares strong behavioral elements, although, intentions are meant as perceived usefulness and Perceived ease-of-use.Meaning that people need to perceive usefulness and intuitive usability in the RET other than having favorable attitudes to adopt it.Expanding further TAM, attitudes can then be also declined into Environmental Attitude (EA).EA has been defined by Hines et al. (1987) as "the individual's feelings, favorable or unfavorable, about particular aspects of the environment or objects related to the environment".Finally, Explanatory behavior theories (e.g.Stern, 2000) linked environmental values and people's attitudes, which again influence their intention and behavior, while the Norm Activation Model (NAM; Schwartz & Howard, 1981) provided empirical support explaining prosocial behaviors within local and community environmental contexts and energy conservation (Black et al., 1985;Tyler et al., 1982); willingness to pay for environmental protection (Guagnano, 2001;Guagnano et al., 1994); recycling (Bratt, 1999;Hopper & Nielsen, 1991;Vining & Ebreo, 1992); and general pro-environmental behavior (Nordlund & Garvill, 2002;Schultz et al., 2005).This research highlighted how, in the formation of a personal norm, two other factors should be included in "behavioral intention" models, namely: Awareness of consequences and control believes.Rotter (1966) Locus of control theory (LOC) refers to an individual's perception about the underlying main causes of events in their life.If people think events can be driven by their behaviors that is a belief in internal control.Attributing internal causality, although, is not enough to engage a behavior.Bandura in his Social Cognitive Theory (1977) affirms that the inclination to engage in a given behavior is strongly influenced by self-efficacy, as the confidence one has in the ability to perform the behavior, and by the expected outcomes, as the expectation, often rewarding, of acting a behavior.Finally, another significant dimension worth mentioning is the concept of Environmental risk perception.RETs are characterized by a high level of uncertainty, with long-term and delayed consequences, and also consequences that occur having RETs in the community's backyard.All these aspects may result in a discounting of such risks, which are taken less seriously than risks with negative outcomes that occur for sure, now and here (Gattig & Hendrickx, 2007).When dealing with environmental risks, it is frequently necessary to balance benefits that occur for sure and immediately against losses that are uncertain and delayed (Gattig & Hendrickx, 2007).Decision-making, influenced by opting between pro-environmental and pro-self-alternatives, concerns the trade-off between risks and benefits of adopting renewable energies and is an essential step towards social acceptance.This trade-off may be modulated by motivational factors, such as intrinsic and extrinsic sources of motivation (Ryan & Deci, 2020).While both sources can motivate PEBs, extrinsic motivation can also have an inhibiting effect on the self-driven motivations of "green" consumers (Ali et al., 2020).Individual differences in environmental concern are viewed as an intrinsic motivational factor that influences willingness to accept larger trade-offs between personal and environmental gain (Hansla et al., 2008).External motivational factors, such as heuristics (Tversky & Kahneman, 1974) can be represented by a tendency to make judgments close to anchors, as described by Tversky and Kahneman (1974).For example, anchoring influences people's willingness to accept and pay for carbon taxes for flying, even when people have been made aware of the influence from anchors on decisions beforehand (Bahník et al., 2016;Brouwer et al., 2008;Furnham & Boo, 2011;Sonnenschein & Smedby, 2019;Strack et al., 2016).Silvia (2008) highlights the benefits of motivating the prosumer, but the literature stops short of identifying what are the variables that would motivate the prosumer.
The present study.The present research aims to support a data-driven approach able to deal with climate change and identify & quantify the psycho-sociological dimensions and factors that could facilitate the transition throughout the "prosumer business models" (Figure 3).Starting from all the theoretical definitions of the prosumer psychological individual and social characteristics leading to social acceptance of this new renewable energy business model, the main models emerged from the literature review will be investigated and quantified, in a sample of European citizens, to extract the main factors able to influence the decision of becoming a prosumer (i.e., intentional acceptance to adopt a RET).The specific goals were twofold: 1) Identify the main factors (individual and social) behind the adoption of being a prosumer and quantify their importance (for the ones that were already prosumers); 2) Identify and quantify the factors that could be better able to predict the decision to become a prosumer (for the ones that are not yet prosumers).In that way, the present research aims to facilitate policymakers and relevant stakeholders to better understand the relevant psycho-sociological factors to specifically target when proposing change towards sustainable energy production and consumption.

Methods
To understand which socio-psychological factors could define social acceptance of RET and innovative community-based production and consumption models (the Prosumer business models for local communities), an online survey was set up and administered to consider, according to the literature review, the most relevant aspects influencing Individual and Social Acceptance from local communities (Figure 3).

Building the "Prosumer" Acceptance Index survey
The first reference framework for building the questionnaire was Wustenhagen et al. (2007), and the 3 main sub-components identified in forming the so-called "triangle of social acceptance" with the addition of the 4th component regarding individual psychological factors.Items coming from already validated scales, like the Awareness towards social acceptance factor (Wustenhagen et al., 2007) were used to assess respondents' perception and knowledge about energy loss in energy transportation, about which energies could be defined as renewable, which energy system is most consuming and knowledge about European directives.From Ellis & Ferraro (2016) and Huijts et al. (2012), the most relevant aspects influencing social acceptance were derived.Questionnaire developed by Moula et al. (2013), was also included, complemented with additional ad-hoc questions to cover all the dimensions.To have an idea of the personal differences in how people accept and use technology, Davis's (1989) technology acceptance model was implemented as an integration of Ajzen's (1991) Planned Behaviour Theory.Ad hoc questions were also included to determine the perceived risks and benefits of specific prosumer business models proposed.An initial version of the survey was generated combining standardized and ad-hoc questions, adapted for the purposes of the present research.The final survey was composed of 31 main questions: 5 multiple-choice questions, 12 items requiring the respondent to declare the level of agreement on a 5-point Likert scale, 6 items that required the respondent to rank the order of perceived importance of different elements, 7 close-ended and 2 open-ended responses (Table 1).For the close-ended responses a numerical score was calculated, assessing 1 point to the correct answers.The final survey was divided into three parts: The first part introduced the project, the aims of the survey and ethics statements regarding the privacy policy, consent form, and GDPR compliance pages and information.No personal or sensitive information was collected; the data was anonymized from the beginning.The second part collected 10 socio-demographic variables (such as gender, age, nationality, level of education etc.).This information was analyzed in an aggregated and anonymized way.The third part collected questions about the following factors: knowledge (I) and awareness of renewable energies (II); individual environmental attitudes (III); personal norms influences (IV); individual decision making and perceived behavioral control (V) as the perceived control orientation (VI) and expected outcomes (VII) to accept RETs, and relative perceived risks and benefits; and a series of questions to quantify the intention to accept the prosumer sustainable business model proposed by EU regulation.

Procedure
All the questions in the second and third part of the survey were mandatory, so the respondent could not proceed with the survey if some item was not responded to, but to partially mitigate this effect, the option "other" and open-ended questions were always inserted, to enable the respondent to express additional information or comments and integrate their responses.The data collection was completed between 28th April 2020 and 31st July 2020 with the translation and distribution in seven different European languages (Italian, English, French, Dutch, Spanish, Greek, Polish).The online survey was distributed via the Survey Monkey platform.

Sample
A total of 212 respondents from a total of 17 nations answered the survey, aged from 18 to over 65 (female = 57%; N = 121; male = 42%; N = 89; other = 1%; N = 2).Age distribution presented more than 10 responders for each age range, and it reached almost the 50% percentile by responders younger than 34 years (cumulate percentage: 46%) while the rest of responders can be described as older than 34 years old (cumulate percentage: 54%).Almost all respondents' education levels varied between bachelor's degrees and Ph.D. (Cumulative Percentage: 90%).More precisely, "College diploma/bachelor's degree or higher" is, by far, the most frequent category (Mode: N=170), followed by "Doctorate" (N=20) and "Secondary school/Upper secondary" (N=18).The full sample is composed almost entirely of household consumers (Mode: N=128), tenants/leasehold consumers (N=57), and landowner consumers (N=21): all categories with similar power behaviors.No industrial or commercial consumers participated in the survey.Respondents of the survey formed a heterogeneous sample, including countries like Germany, The Netherlands, the United Kingdom, Belgium, Switzerland, Poland, France, Albania, Slovenia, Hungary, Italy, Bulgaria, Portugal, Spain, Greece.

Ethics and consent
All RENAISSANCE results have been conducted according to the requirements of ethics and integrity of the GA.
An Ethics Issues Table has been completed as part of the application process in addition to the Ethics Self-Assessment form.Guidelines and instructions by the EC have been followed and all ethics obligations have been fulfilled.Participants were asked to give consent before starting the survey by submitting a form; the consent was voluntary and To what extent would you agree to install a small to medium size renewable energy production system on your property renegotiable, so participants could decide to withdraw at any point.

Data analysis
Internal consistency of the "prosumer index survey" was tested using Cronbach's alpha for each of the psychological factors highlighted in Table 1, while for the socio-demographic data of the sample, descriptive statistics were performed.
To identify the main factors (individual and social) modeling the relation with renewable energy technology models for participants to the survey that were already prosumers, a Factorial Analysis has been conducted to identify the latent variables that are related to each other, to generate a data-driven model of a "prosumer".
To identify and quantify the factors that could better predict the behavioral intention to become (or not become) a prosumer, linear regression has been conducted to estimate the influence of the independent variables on the dependent variable Acceptance of being a Prosumer (Table 1).
Data processing and analysis were performed through the IBM SPSS Statistics 21.
The carried out analyzes between the different variables took into account an acceptability confidence interval of 95%.

Cronbach's alpha and descriptive statistics
For the groups of items addressing "Awareness" the coefficient for the items was .778.For the groups of items addressing "Attitudes", the alpha coefficient was .636.For the groups of items addressing "Social Norms", the alpha coefficient was .631.For the groups of items addressing the "Economic Control" part of the "Environmental Risks", the alpha coefficient was respectively .577, while for the remaining items, they were ranking questions, so no overall score could have been considered.Given the acceptable alpha coefficient, for each factor, a sum of the items was calculated, for each independent variable (Table 2).

Factorial analysis
A factorial using principal axis factoring as the extraction method, with a Varimax with Kaiser normalization rotation method was used, entering all the items concerning psycho-sociological dimensions considered on the survey, for all the users that were considered as "Potential Prosumers" (N=112).The threshold for being a prosumer was set using percentile variability in the summed scores of the "Acceptance of being a prosumer" higher than average 3 on a 5-point average Likert scale, as well as the scores to those features that already characterize a prosumer (i.e., Q8).
As it can be seen in Figure 4 and Table 4, the analysis yielded five factors explaining a total of 62.428% of the total variance for the entire set of variables.The prosumer could be then described by those 5 latent variables.4), that also presented a mild correlation with Factor 1 (as can be seen in greyed-out values in Table 4).It explained 8.629% of the total variance.
Factor 4 was labeled "Social Influence" for the high tendency of asking for advice before switching to a different energy supply service (Q41) and the availability to adopt renewable energies when the majority of your neighbors are doing so (Q42).It explained 6.772% of the total variance.
Factor 5, finally, was labeled as "Impact of Costs on Bills" as prosumers resulted interested in Less (Q34.1) or unvaried costs of bills when adopting a prosumer model (Q34.2).This factor explained 5.529% of the total variance of being a prosumer.

Linear regression
Linear regression has been conducted to predict the influence of the independent variables on the dependent variable "Acceptance of being a Prosumer".A significant regression equation was found F(3,125)=10.668,p>0.01 (Table 7) with an R 2 of .204(Table 6) considering a Model with 3 main factors: Overall Attitude Scoring; Economic benefits (e.g.lower energy costs, potential income); and Age (Table 5).
Participants predicted acceptance of becoming a prosumer was equal to 5.399 (Constant) + .057(Overall Attitude scoring) + 181 (Perception of Economic Benefit score) -.234 (Age of participant).That is to say that participant acceptance of becoming a prosumer increased when attitudes overall scoring, perception of economic benefits, but do decrease with age.Despite R 2 being not so powerful (below .300),Collinearity Statistics were acceptable (Table 8), and both the scatterplot (Figure 5) and the standardized residuals were normally distributed (Figure 6).

Discussion
The present research aimed at identifying psychological factors that could predict social acceptance becoming a Prosumer.Specifically, knowledge, awareness levels, attitude, control perception, and norms could influence the intention to adopt new RETs business models.Starting from the three Wüstenhagen et al. (2007) dimensions, a fourth dimension with a more direct focus on the individual characteristics has been added, including TPB, TAM, NAM, EA and Environmental risk perception.A structured survey using consolidated items   measuring different psychological variables involved in becoming a prosumer was generated and thus the latent factors were highlighted, thanks to exploratory factorial analysis.To predict the acceptance scoring, linear regression has been performed, to identify which specific questions could be used in future research to predict social acceptance of becoming a prosumer.Results clearly state the latent factors behind the availability of being a prosumer and provide an indication to which items could be selectively being included in surveys to measure the intended behavior of becoming a prosumer.

Significant factors behind potential prosumers
Through Factorial Analysis it was possible to: identify the main individual and social factors able to intervene on the intention  of becoming a prosumer and; quantify their importance.The principal axis Factorial Analysis on the N=112 "prosumers" of the sample, revealed 5 latent psychological factors: -Factor 1 -Factor 5. Impact on bill cost: from a more pragmatic point of view, the potential prosumer is prone to adopt a new RET when economic incentives are perceived.This economic aspect seems to affect the decision-making process specifically in a situation that could potentially result in less expensive bills or unvaried bills.
These 5 factors represent data-driven aspects that can be coherently being reconducted to the psychological theories chosen as reference.Latent to social acceptance is the awareness (Figure 3    as balancing between perceived pros and cons, benefits and risks, in the decision-making process, where the economic incentive is the brief-term benefit usually not observable with these types of energies.
Predict the acceptance of renewable energy technology models Once described five-factors psychological model of "prosumer" social acceptance, the model was tested in order to quantify the ability of the factors in predicting the acceptance of RET on the entire sample.An overall scale measuring "acceptance of a new energy solution" was used as dependent variable, and it was possible to quantify the contribution of the five factors measuring: awareness of environmental issues and climate change; environmental attitudes; social influence; and environmental risk perception.From the linear regression, it was possible to assert that three variables are able to significantly measure and predict the scores of the "Acceptance in becoming a prosumer" ad hoc scale.

Variable 1: Attitudes
To predict someone's acceptance in becoming a Prosumer, fundamental is to consider their attitudes.In the Prosumer Index, attitudes were measured, as intended in TPB (Ajzen, 1991), as the degree to which a person has a favorable or unfavorable evaluation or appraisal of the behavior.Within the model, it was found as a predictor of the behavioral intention to accept and adopt a new RET business model such as the prosumer one.Specifically, EA (Hines et al., 1987), as the feelings on particular aspects of the environment or objects related to the environment, predicts the behavioral intention towards acceptance.Furthermore, to have favorable or unfavorable attitudes, the subject bases the evaluation on knowledge and awareness.Attitudes were operationalized and measured as the agreement to specific environmental issues and global climate change issues to assess their concern and evaluation in the direction of a behavioral intention.People characterized by high scores in environmental attitudes and detailed knowledge on environmental issues (such as biospheric values), are the ones with most favorable scores about moving towards a different energy solution.They should be the first members of communities to be involved in such process, in order to facilitate and trigger also the positive social influence of other potential prosumer living in their local community.
Variable 2: Economic incentive The sensitivity toward the economic incentive is the second element able to predict someone's behavioral intention to adopt a new RET.In the research, this aspect was reconducted to the perceived behavioral control (Ajzen, 1991) and its related Environmental Risk Perception, in terms of perceived short-term benefits (usually absent in RET solutions as identified by Wustenhagen et al., 2007) and long-term costs, both part of the decision-making process in terms of expected outcomes (Bandura, 1977) of the behavior itself.Strategies or policies that meet such economic characteristic, such as lower or invariant bill's energy costs, are linked to higher scores in the acceptance of such business models.Such link, appear significant regardless of the presence of other economic indicators, investigated in the present survey (e.g.average income, place of residency, family members etc.).According to Ryan & Deci (2000) in the Self-Determination theory "extrinsic motivation" triggered by economic incentives, would work as classic "reinforcement" that can motivate the people with less score in pro-environmental attitudes, in becoming a prosumer.At the same time, "intrinsic motivation" would find satisfaction by fulfilling values and psychological needs (such as healthy and sustainable behaviors) that enable also positive expected outcomes such as controlling energy costs and contribution the local community.Indicating that the psychological mechanism behind the economic aspect of "prosumer" acceptance should dwell into the perceived sense of control (e.g., positive expected outcomes of the pro-environmental behavior) and the consequent (intrinsic or extrinsic) motivation process.
Variable 3: Age Age is the third variable that was found to predict the acceptance in becoming a prosumer.Consistently with previous research, younger people seemed to be more sensitive to environmental dimensions and issues as opposed to older adults.Younger respondents in our sample had fewer economic possibilities compared to adults.Their smaller economic possibilities don't seem to influence their already established view and perception of the energy supply.Although younger people can be seen still in the process phases of auto-determination in terms of attitudes and norm, and they are more subject to peer and community influences, it is fair to assume that their LOC orientation (Rotter, 1966) tends to be more internal, perceiving their course of action as a consequence of their personal decisions.Hines et al. (1987), for instance, showed that LOC is one of the personality factors to determine PEBs intention.
To conclude, any stakeholder, policy maker or regulator that envision the creation of surveys and questionnaires favoring/facilitating or supporting citizens' acceptance transition of a RET, and for example, in becoming a prosumer, these three factors should be measured to consider, treading the path towards those individuals prone to accept and adopt a RET business model.

Strengths, limitations, and future research
Various theories used in this research have already been profoundly studied and presented in different papers and journals, however the prosumer business models, as RETs, is a relatively new concept where scant literature is available, as it also is in the European reality, where such a typology of energy supply is almost completely nil.This point gives strength to the present research in the attempt to put the basis for the understanding of individual acceptance related to broader social acceptance.Furthermore, trying to understand the individual acceptance, the research tries to define who is the prosumer from a specific psychological point of view, and how this psychological dimension influences RETs adoption, highlighting the existing relation between the subject and the new sustainable business models.This opens the road to better understanding and defining which are the overall characteristics and conditions to foster such a transition towards sustainability.
Regarding limitations, the research stops on a "behavioral intention" (VI) level and does not take into exam observable actual behaviors.
Second, the answer given to the survey may be biased by the framing of the questions, for example, not mentioning in detail what "collective and shared" consumptions stand for and unavoidably failing in describing a large amount of different possible solutions.
Hidden costs, transparency issues, and low maturity of services are further aspects to be investigated in order to have a more comprehensive understanding of Social Acceptance as possible risks for respondents.
Regarding the sample, it is neither representative of the European (EU-27) population, nor a specific Nation or specific social group.The respondents have been collected among members involved in European discussion tables of new energy business models and renewable energy technologies.
Due to the project requirements and scopes and the model used in the paper, different psychological aspects of the person have been just mentioned or left out.For instance, personality traits are fundamental characteristics to investigate in an environmentally concerned person; important is the trustworthiness in the other actors such as policymakers, marketers, etc., and in the technology itself.Two dimensions of trust have been identified by research and are particularly relevant for project acceptability, namely competence-based trust (i.e., trust in knowledge and expertise of responsible agents) (Gordon et al., 2014;Terwel et al., 2009) and integrity-based trust (i.e., trust in honesty and transparency of responsible agents) (Braun et al., 2018;Graham et al., 2009).Fundamental is to consider the environment the subject lives in and what are the policies regarding renewable energies in the country; and finally, related to these last two aspects is the need of a better understanding of the community point of view accepting a RET, not as the singular individual.
Future research will be able to focus on actual behaviors of accepting and adopting such RETs.Other intervening psychological individual factors such as trust, personality, community-specific factors and dynamics could be explored to integrate the already existing factors.
Future research will be able to study the above-mentioned characteristics gathering representative samples of national and European communities, using this research as a baseline to be adapted for specific community/nation groups, and exploring further individual psychological elements.

Conclusions
The present research gave an overview of the already identified dimensions of social acceptance with the introduction of a fourth dimension specific to individuality and its psychological dimensions, focusing on social and individual factors that influence behavioral intention to accept a RET.The economic incentives help frame the perception of a possible transition, reducing the usually perceived short-term costs for the individual in juxtaposition to the perceived long-term benefits for the individual, for the local community and for the environment.The economic incentive can provide a positive element for motivation fulfilling the extrinsic (for the reinforcement) and intrinsic motivation in acting a coherent behavior (experiencing competence, autonomy, behaving pro-environmentally).

Citizen engagement to become prosumer
When coming to propose a new energy business model, it is important to involve the community, its members, and their identity, observing the presence of specific environmental attitudes shared among the group.From the descriptive statistics, friends and colleagues are considered by far the most reliable source for advice, followed by publications and academic journals.Raising the levels of awareness should be a priority through informational campaigns highlighting the agency capacity of these communities if they had to adopt a shared energy plan.The decision-making process should be accompanied by a clear and transparent explanation and framing of the consequences of opting out or opting in with clear benefits and costs.For a positive acceptance, the perceived short-term costs of a RET; the possibility of a landscape disfigurement (depending on the solution); the long-term benefits, etc., should all be explained.Anyhow, knowledge alone is not sufficient.The process should be composed with some behavioral guidelines framed enhancing the advantage of these actions, opposed to negative consequences.Economic incentives, however, should be contemplated by policies and governments, as a boost to fasten the transition, thanks to the reduction of some limiting short-term costs giving the freedom to focus on the long-term benefits and raising satisfaction levels that can fill subjects' motivation in the decision-making process.Indeed, economic incentives are a strong driver, nevertheless, the participation in the energy transition is driven more by the intention to energy sharing and collective benefits rather than a mere investment.
Other individuals not interested in these initiatives should not be forgotten.The so-called late adopters will be pulled aboard seeing that nations, governments, policies, economic incentives, and citizens are moving in the same direction, undergoing social pressure and finding a mismatch between their personal norms and the line taken and desired, in accordance with the U-curve of Acceptance.
Concerning results and recommendations addressed to policymakers, regulators, and all energy market actors, the present paper suggests expanding research about decision-making processes and the related expectations of involvement by communities and citizens: -Improving the general level of knowledge and awareness concerning mutual dependences of environmental issues, economical aspects, and energy value chain; -Identifying the gaps between the actual regulatory landscape and comprehensible, clear, and updated information; -Increasing the accessibility and effectiveness of information regarding energy transition incentives; -Supporting the implementation of innovative energy business models and capacity buildings both in the public and private sector by promoting consensus-building across local administrations, energy market actors, and consumers.
-Consider ad-hoc campaigns to involve and raise awareness in adults and incentives and financing for youngers with fewer economic availabilities.Moreover, the causality could be brought out better.Currently, the authors start with: "(…) aims at supporting a data-driven approach able to deal with climate change and identify and quantify the psychosociological dimensions and factors that could support the transition from a technology-driven approach to a consumer-driven approach (…)."In fact, I would argue that the researchers primarily identify enabling factors to increase technological acceptance.This consumer-driven approach potentially facilitates the energy transition, contributing to combating climate change.Furthermore, tension between technology-driven and consumer-driven approaches in the energy transition is a significant challenge.However, the authors do not reflect on this circumstance in the course of their research while specifically mentioning it in the abstract.The implications of the own work should be brought out more in this respect later in the manuscript.Lastly, the phrase "This research can facilitate policymakers (…)" should be edited.The research helps policymakers or provides guidance.This fragment reappears on p. 7 and p. 16.
I think the manuscript would benefit from separating the introduction from a part on the theoretical background and a literature review.I am also missing a thorough review of literature that looks specifically at the issue the authors are analysing.In this respect, much has been done using similar approaches.

2.
I am unsure about the data collection.How was the sample identified?How many invitations were sent out (response rate)? 3.
The methodological part should mathematically reflect the index construction.Moreover, the factor analysis and the regression model should be mathematically reflected.This part is missing.The authors may also do this in the appendix.But it would help to understand what has been done better from a methodological perspective.

4.
The appendix should include a complete version of the questionnaire with an English translation.

5.
The methodological limitations should be reflected in its own section.Here, the researchers should pinpoint potential statistical restrictions of their research better.The sample is with 212 respondents small.We further see that due to missing data, information on several dimensions is very limited (e.g., p. 9, information on social norms comes only from 131 participants).A better reflection on the sample selection would improve the understanding of potential sampling errors better.For factor analysis, the small sample has several implications (e.g., low power, unstable or inaccurate loadings, overfitting).This should be reflected.Similarly, a regression with a small sample size will likely have large confidence intervals.Larger samples and narrower CIs might lead to a different picture.The presented results certainly have merit, but possible flaws should be pointed out better.Diagnostics depicted in the appendix could build further trust in the analysis.

6.
The conclusions under "Citizen engagement to become prosumer" (p.17) are very general and not well tied to the findings of the conducted research.This should be improved.

7.
The relationship to the RENISSANCE project is not clear to us.Please elaborate on this.On p. 3, you write, "Different business models for sustainable community energy production and consumption can be identified, and amongst them, RENAISSANCE identified a set that we can call "Prosumer business models" (RENAISSANCE, 2020)."How does that tie in with your research? 8.
Clearer images of the residual plot and the histogram in Figures 4 and 5 would benefit the overall quality.(p.14).

9.
Again, we thank the authors for their interesting work.All in all, the authors present compelling information important to the field.We believe that after the above revisions, the paper is suitable for indexing.
We confirm that we have read this submission and believe that we have an appropriate level of expertise to confirm that it is of an acceptable scientific standard, however we have significant reservations, as outlined above.2) Identify and quantify the factors that could be better able to predict the decision to become a prosumer (for the ones that are not yet prosumers.
The work is presented in an accurate manner, starting from a contextualization within the body of literature from the variety of renewable energy-based business models to the consideration of the social acceptance dimensions within RETs.In this review, the theoretical definitions of the prosumer psychological individual and social characteristics leading to social acceptance of this new renewable energy business model are collected.
The study design is appropriate and the work technically sound, with sufficient details of methods and analysis provided to allow replication.All the source data and materials underlying the results are available and the statistical analysis and its interpretation is appropriate.I will highlight the construction of models and the consideration of the factors.
The conclusions are adequately supported by the results, but as happened on this type of projects, sometimes the argumentative weight of the conclusions relies more on elements drawn from the literature review than from the conclusions of the analysis of the survey process.Moreover, the total of respondents is low.If applicable, is the statistical analysis and its interpretation appropriate?I cannot comment.A qualified statistician is required.

Are the conclusions drawn adequately supported by the results? Yes
Competing Interests: No competing interests were disclosed.
Reviewer Expertise: Ethics of technology, energy trasition, RRI and enrgy communities I confirm that I have read this submission and believe that I have an appropriate level of expertise to confirm that it is of an acceptable scientific standard.

Figure 3 .
Figure 3. Integrated Prosumer Theoretical Model.The roman numbers indicate the specific models and variables that were operationalized in the final form of the survey.
Deliverables D8.1 (POPD -Requirements n. 1), D8.2 (POPD -Requirement No. 2) and D. 1.4 (Data Management Plan) are used as obligatory guidelines for the project implementation, the data collection and the deliverables development.

Figure 4 .
Figure 4. Plot of Eigenvalues as a function of the number of principal components retained in the model.

Figure 6 .
Figure 6.Histogram distribution of standardized residuals values based on the acceptance of being a prosumer model.

Figure 5 .
Figure 5. Observed cumulative distribution function of the standardized residual compared to the expected cumulative distribution of the normal distribution.
-element II) of environmental issues and climate change; environmental attitude (Figure 3 -element III), formed by concerns and beliefs, in the direction of acting PEBs through behavioral intention (Figure 3 -element VI); the development of social norms (Figure 3 -element II), based on community/nation's social influences, to engage only certain types of behaviors; and the perceived behavioral control (Figure

Reviewer Report 28
September 2023 https://doi.org/10.21956/openreseurope.16157.r35002© 2023 Solangi Y.This is an open access peer review report distributed under the terms of the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.Yasir Ahmed Solangi 1 School of Management, Jiangsu University, Zhenjiang, Jiangsu, China 2 Nanjing University of Aeronautics and Astronautics, Nanjing, Jiangsu, ChinaThe article presents a comprehensive study on the social acceptance of renewable energy and the transition to prosumer (producer-consumer) business models.It aims to identify and quantify psycho-sociological dimensions and factors influencing the adoption of these models, ultimately creating a Prosumer Acceptance Index.The study employed questionnaire data collected through an online survey platform, conducted factorial analysis to reveal latent psychological factors, and performed linear regression to predict behavioral intentions.The results identified five psychological factors and three variables that significantly measure prosumer acceptance.The research has practical implications for policymakers and stakeholders in promoting sustainable energy production and consumption.The article is well-structured and addresses its research objectives effectively.Is the work clearly and accurately presented and does it engage with the current literature?YesIs the study design appropriate and is the work technically sound?YesAre sufficient details of methods and analysis provided to allow replication by others?YesAre all the source data and materials underlying the results available?YesIf applicable, is the statistical analysis and its interpretation appropriate?YesAre the conclusions drawn adequately supported by the results?YesRuth Carbajo Universidad de Lleida, Lleida, Spain This paper broadly describes the dimensions engaged in the process of acceptance in terms of consumers driven approaches and prosumers beyond the already existing considerations.It presents a Prosumer Acceptance Index to identify and quantify individual psychological dimensions to understand the processes and factors that underlie individual acceptance and adoption of new renewable energy business models.For the construction of the index, two steps are considered: 1) Identify the main factors (individual and social) behind the adoption of being a prosumer and quantify their importance (for the ones that were already prosumers).

References 1 .
Wittmayer J, Hielscher S, Fraaije M, Avelino F, et al.: A typology for unpacking the diversity of social innovation in energy transitions.Energy Research & Social Science.2022; 88.Publisher Full Text Is the work clearly and accurately presented and does it engage with the current literature?Yes Is the study design appropriate and is the work technically sound?Yes Are sufficient details of methods and analysis provided to allow replication by others?Yes Are all the source data and materials underlying the results available?Yes
Q44-3 To sell the extra amount to the general electricity grid for the market .551.601Q45-1To sell the extra amount to the general electricity grid and get a discount on your monthly bill.Extraction Method: Principal Axis Factoring.

Table 4 .
Factors.grid (Q44.3) and for the collective consumption of the local community (Q45.2) or an organised form of shared consumption with the local community (Q44.2).It explained 13.095% of the total variance.
Extraction Method: Principal Axis Factoring.Rotation Method: Varimax with Kaiser Normalization.(a)Rotation converged in 8 iterations.electricity

Table 5 .
Variables Entered a .
For the ones that are already prosumers, five latent factors have been identified: what drives the change in accepting and adopting a RET is the concern about environmental issues and the concern on climate change.The individual is indeed interested in sharing the energy production and consumption, and has an interest in an unvaried or lower cost of bills.Regarding the predictors for the acceptance from individuals to become a Prosumer, the linear regression model suggests that at the increasing of Environmental Attitudes, Economic incentives, and decreasing of people's Age, individuals are prone to accept and adopt a new RET business model like the prosumer business models.Measuring Attitude proper to the individual, what are his knowledge, concerns, values, and levels of awareness regarding renewable energies can predict the overall acceptance of becoming a prosumer.

Eurobarometer Survey: Europeans consider climate change to be the most serious problem facing the world.
EuropeanCommission press release.2021.