This is a Free article. You will receive access to the full text.

Is a Wetter Grid a Greener Grid? Estimating Emissions Offsets for Wind and Solar Power in the Presence of Large Hydroelectric Capacity

Free Article

I use random fluctuations in hourly wind and solar generation in California to estimate how much they reduce emissions of carbon dioxide, sulfur dioxide, and nitrogen oxides. These offsets depend on the direct displacement of high-cost natural gas generators, and on the hydropower reallocation that occurs to the hours with the lowest increase in renewable generation. Solar power daily intermittency shifts hydro from the afternoon to the evening, which increases its emissions offsets since the gas generators displaced in the evening are dirtier than those kept running in the afternoon. In contrast, wind offsets are less sensitive to hydropower reallocation, since it leads to a substitution of generators with similar emissions intensities. These findings highlight the importance of accounting for interactions between wind, solar, and hydro capacity in assessing their environmental benefits. Similar lessons will apply to electric grids with storage capacity.

Download Executive Summary Download PDF

Keywords: Wind and solar power, Hydropower, Dynamics, Emissions offsets

DOI: 10.5547/01956574.40.1.mcas

References: Reference information is available for this article. Join IAEE, log in, or purchase the article to view reference data.

Published in Volume 40, Number 1 of the bi-monthly journal of the IAEE's Energy Economics Education Foundation.


© 2023 International Association for Energy Economics | Privacy Policy | Return Policy