1. O’Connor, P. A. & Cleveland, C. J. U.S. energy transitions 1780–2010. Energy 7, 7955–7993 (2014).
2. Bridge, G., Bouzarovski, S., Bradshaw, M. & Eyre, N. Geographies of energy transition: space, place and the low-carbon economy. Energy Policy 53, 331–340 (2013).
3. 2017 Wind Technologies Market Report (US Department of Energy, 2018);
https://www.energy.gov/eere/wind/downloads/2017-wind-technologies-market-report
4. Utility-Scale Solar: Empirical Trends in Project Technology, Cost, Performance, and PPA Pricing in the United States—2018 Edition (Lawrence Berkeley National Laboratory, 2018);
http://eta-publications.lbl.gov/sites/default/files/lbnl_utility_scale_solar_2018_edition_report.pdf
5. Carley, S. State renewable energy electricity policies: an empirical evaluation of effectiveness. Energy Policy 37, 3071–3081 (2009).