This research suggests that the under-one-roof taxation and incentives approach combined with a regularly adjusted subsidy may be the best course of action for learning by doing in renewable energy technology. In terms of financial investment, the study looks at how tax incentives and other forms of support for renewable energy sources are evaluated. The essential features of renewable energy sources are that they help to protect the environment, and renewable energy investments are a hot topic on the agendas of many countries. The Turkish energy market has been exposed to the liberalization process. So, the government, investors, and the people of the country are the main owners of these projects. Each partner directly or indirectly affects these investments or is involved in them. These things should be managed in a way that keeps the whole system in balance. This method turns the problem into a multi-objective optimization problem, with the goal of maximizing the benefits for all stakeholders. This research investigates the items related to renewable energy investments to analyse the risk factors for system risk mitigation and tax approaches.