It will be interesting to explore the socio-economic and techno-environmental effects of renewables vis-à-vis the global energy mix dominated by fossil fuels.
In addition, you can explore the effects of these energy transitions based on various innovation system theories (e.g. Strategic Niche Management, Tech Innovations Systems, Best-Worst Approach etc.).
Designing a framework for a supposed enterprise which could determine the share of each renewable projects share in their investment portfolio. It could be a ranking or Multi-criteria decision support system which rank the renewable projects based on social and economic criteria. Stakeholders participation could be happen in the process of defining and weighting criteria .