Renewable energy cooperatives (RECs) play a pivotal role in advancing a new energy paradigm that prioritizes equity and inclusivity. However, there is often ambiguity regarding their potential since their core principle of functioning revolves around serving the mutual interests of their members by providing energy services rather than addressing general- interest missions. Moreover, RECs still operate as businesses that are economically viable and appealing, thereby attracting the influence of financial interests. In this context, balancing the tripartite spectrum of interests, namely capital, mutual, and general, can be complex. To gain a deeper understanding, we conducted a survey among 5402 members of two RECs, namely Ecopower in Belgium and `enostra in Italy, complemented by 20 semi-structured interviews. Our findings indicate that members have mixed feelings about assuming general- interest missions, such as fighting against energy poverty, which do not always align with those of their boards. We also note significant differences between the two RECs, which can be attributed to the distinct contexts in which they operate and their varying stages of maturity. We conclude by discussing the importance of scaling up and the need to adopt a more collaborative approach between the public and third sector to address the complexities of social issues.