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Published September 25, 2020 | Published + Supplemental Material
Journal Article Open

Effects of Deep Reductions in Energy Storage Costs on Highly Reliable Wind and Solar Electricity Systems

Abstract

We use 36 years (1980–2015) of hourly weather data over the contiguous United States (CONUS) to assess the impact of low-cost energy storage on highly reliable electricity systems that use only variable renewable energy (VRE; wind and solar photovoltaics). Even assuming perfect transmission of wind and solar generation aggregated over CONUS, energy storage costs would need to decrease several hundred-fold from current costs (to ∼$1/kWh) in fully VRE electricity systems to yield highly reliable electricity without extensive curtailment of VRE generation. The role of energy storage changes from high-cost storage competing with curtailment to fill short-term gaps between VRE generation and hourly demand to near-free storage serving as seasonal storage for VRE resources. Energy storage faces "double penalties" in VRE/storage systems: with increasing capacity, (1) the additional storage is used less frequently and (2) hourly electricity costs would become less volatile, thus reducing price arbitrage opportunities for the additional storage.

Additional Information

© 2020 The Author(s). This is an open access article under the CC BY license (http://creativecommons.org/licenses/by/4.0/). Received 4 December 2019, Revised 14 June 2020, Accepted 17 August 2020, Available online 20 August 2020. Published: September 25, 2020. We thank Jacqueline A. Dowling, Lei Duan, Patrick T. Brown, Dan Tong, Yixuan Zheng, and David J. Farnham for their insightful inputs. This work was supported by a gift from Gates Ventures LLC. Author Contributions: F.T., N.S.L., and K.C. designed the study; F.T., M.Y., and K.C. developed the model with inputs from N.S.L. and S.J.D.; F.T. and K.C. performed the analysis with inputs from M.Y., N.S.L., and S.J.D.; F.T. drafted the manuscript; F.T., M.Y., N.S.L., S.J.D., and K.C. edited the manuscript. The authors declare no competing interests.

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Supplemental Material - 1-s2.0-S2589004220306763-mmc1.pdf

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