Wind and solar power projects are relevant alternatives to fossil fuels and constitute a focal point for achieving greenhouse gas (GHG) emissions reduction in national strategies (e.g. Portugal). Yet, despite the relevant contribution to electricity generation, renewable energy projects also entail externalities, i.e. impacts that inadvertently affect ecosystems and communities at different levels and that are not accounted for by the agents that produce them. For instance, health benefits provided by avoided emissions as positive externalities or biodiversity loss that affects flora and fauna as negative externalities. Valuation of externalities may resort to a myriad of methods, among which contingent valuation, travel cost valuation, or market price-based methods. This paper intends to summarize them for wind and solar power projects and the methods of their economic valuation. To promote a better understanding of the impacts and possible valuation alternatives, a specific research string was adopted and applied to the research database, followed by exclusion criteria to establish a sample of articles to assess. This overview may contribute to discerning different types of economic valuation for each externality, contributing to the economic and energy engineering scope. Finally, policy implications for energy transition based on wind and solar power projects are provided.

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externality,wind power,solar power

• Earth and related Environmental Sciences - Natural Sciences
• Electrical Engineering, Electronic Engineering, Information Engineering - Engineering and Technology
• Economics and Business - Social Sciences