This presentation focuses on the evaluation of weather events in long-term power system planning, considering the changing dynamics of the energy transition. It also covers the changing resource adequacy needs resulting from the energy transition, emphasizing the need to ensure a reliable power supply in the face of gas constraints, renewable energy integration, and retiring thermal generation. The analysis of extreme weather events is also explored – with emphasis on capturing winter risk – by highlighting the use of advanced data analytics and modeling techniques to assess the potential impacts on infrastructure, generation capacity, and grid reliability. The discussion will also include recommendations for incorporating weather patterns into electrification load profiles to develop accurate future electricity demand estimates. This presentation aims to provide power system planners with practical recommendations and insights to navigate weather-related risks and the energy transition, en