The Performance of U.S. Wind and Solar Generators: An Update

Richard Schmalensee

November 2014

Richard Schmalensee, November 2014

Using data on hourly outputs and spot prices for a sample 25 wind and nine solar generating plants covering all seven U.S. ISOs for 2011 and up to 12 adjacent months, this study examines capacity factors, average output values, and several aspects of intermittency. Most performance measures studied vary substantially within and between ISOs, and some vary substantially over time. Implications for research, market design, and policies to support renewable generation are briefly discussed.

Keywords: wind, solar, renewable, VER, generation

For Associates Only

As a benefit to our Associates, the latest Working Papers are embargoed for a period of up to six months before becoming accessible to the public. If you are interested in becoming an Associate or learning more about the benefits of sponsorship, please click here, or email us at

If you are a CEEPR Associate or CEEPR staff member, please visit the login page here: