Safdarian, FarnazCook, JordanZhgun, KseniiaOverbye, ThomasSnodgrass, Jonathan2024-12-262024-12-262025-01-07978-0-9981331-8-8d1efe882-7a45-499c-bf5d-b59607a8745chttps://hdl.handle.net/10125/109224This paper presents an approach for modeling weather and other environmental inputs (ENIs) in the power flow and related tools with a focus on electric grid transmission planning. Such work is needed because of the rapidly growing dependence of electric grids on the weather and the need to consider the impact of more severe resiliency events. The paper presents a modeling approach, and then demonstrates it using several large-scale electric grids. Validation is also considered. A key contribution is to show that environmental inputs can be directly integrated into existing power flow and related tools such as contingency analysis and optimal power flow.9Attribution-NonCommercial-NoDerivatives 4.0 InternationalResilient Networkspower flow, resiliency hazards, transmission planningConference Paper10.24251/HICSS.2025.382