This paper is aimed at identifying economic and environmental evidence related to strategic risk caused by global climate change issues. To achieve this objective, descriptive and exploratory research was carried out, in the form of a case study, aiming to delimit the variables observed, the geographic area and the result of their possible interactions, in the context of a large company in the Brazilian hydroelectric energy industry. To characterize the importance of adapting its strategic planning in light of possible impacts from global climate changes, the Expert Panel, the Delphi Method and the SWOT Matrix were used as research techniques. The combined use of these three methods permitted further refinement of the research including the construction of long-term scenarios that could be inferred with regards to the research questions. The results obtained demonstrate that the reduction of water flow and reservoir levels, due to climate change, represent the main strategic environmental risks for the company being researched, which could threaten its corporate competitiveness and negatively compromise its operational, economic, and social performance until the year 2050.