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Changes in Hydropower Resource Operations Following Participation in the CAISO Energy Imbalance Market - A Case Study

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posted on 2022-08-29, 17:16 authored by Sohom DattaSohom Datta, Abhishek Somani, M.J.E Alam, Xueqing Sun, vanshika fotedar, Al;ex Banicki

Portland General Electric (PGE), an investor-owned electric utility serving nearly 900,000 customers in 51 Oregon cities, joined Western Energy Imbalance Market (EIM) – a California Independent System Operator (CAISO) platform for sharing cleaner and more efficient generation resources among multiple states in the Western U.S. While participation in EIM brings a new set of economic opportunities for PGE by capturing flexibility needs in the market, it also changes operational patterns (e.g., more frequent start/stop, off-nominal power output, and ramping) of PGE’s conventional generation fleet, including hydropower units. With 492 MW of hydropower capacity, which constitutes 15% of PGE’s generation mix, it is important for PGE (as any other EIM-participant utility) to understand how participation in EIM impacts its hydropower assets, and how a techno-economically sustainable operation of those assets could be accomplished. In this paper, a case study is performed with PGE’s hydropower generation facilities to assess and quantify EIM?participation driven changes in hydropower operational patterns 


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Pacific Northwest National Laboratory (PNNL)

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  • United States of America