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Projecting changes in annual hydropower generation using regional runoff data: An assessment of the United States federal hydropower plants

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Listed:
  • Kao, Shih-Chieh
  • Sale, Michael J.
  • Ashfaq, Moetasim
  • Uria Martinez, Rocio
  • Kaiser, Dale P.
  • Wei, Yaxing
  • Diffenbaugh, Noah S.

Abstract

Federal hydropower plants account for approximately half of installed US conventional hydropower capacity, and are an important part of the national renewable energy portfolio. Utilizing the strong linear relationship between the US Geological Survey WaterWatch runoff and annual hydropower generation, a runoff-based assessment approach is introduced in this study to project changes in annual and regional hydropower generation in multiple power marketing areas. Future climate scenarios are developed with a series of global and regional climate models, and the model output is bias-corrected to be consistent with observed data for the recent past. Using this approach, the median change in annual generation at federal projects is projected to be -2 TWh, with an estimated ensemble uncertainty of ±9 TWh. Although these estimates are similar to the recently observed variability in annual hydropower generation, and may therefore appear to be manageable, significantly seasonal runoff changes are projected and it may pose significant challenges in water systems with higher limits on reservoir storage and operational flexibility. Future assessments will be improved by incorporating next-generation climate models, by closer examination of extreme events and longer-term change, and by addressing the interactions among hydropower and other water uses.

Suggested Citation

  • Kao, Shih-Chieh & Sale, Michael J. & Ashfaq, Moetasim & Uria Martinez, Rocio & Kaiser, Dale P. & Wei, Yaxing & Diffenbaugh, Noah S., 2015. "Projecting changes in annual hydropower generation using regional runoff data: An assessment of the United States federal hydropower plants," Energy, Elsevier, vol. 80(C), pages 239-250.
    • Handle: RePEc:eee:energy:v:80:y:2015:i:c:p:239-250
    DOI: 10.1016/j.energy.2014.11.066
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    1. Clara Deser & Reto Knutti & Susan Solomon & Adam S. Phillips, 2012. "Communication of the role of natural variability in future North American climate," Nature Climate Change, Nature, vol. 2(11), pages 775-779, November.
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