워싱턴의 태양광 발전은 주로 연방 세액 공제 30%와 설치 비용 감소로 인해 2013년에 27MW 이상으로 확대되었다.워싱턴은 또한 연간 최대 5000달러(약 15센트/kWh)의 수입 관세를 지불하고 있는데, 이는 패널이 주(州)에서 만들어지면 2.4배, 인버터가 주([1][2]州)에서 만들어지면 1.2배 더 늘어난다.
^Sherwood, Larry (July 2014). "U.S. Solar Market Trends 2013"(PDF). Interstate Renewable Energy Council (IREC). Retrieved 2014-07-21.
^Sherwood, Larry (July 2013). "U.S. Solar Market Trends 2012"(PDF). Interstate Renewable Energy Council (IREC). p. 16. Retrieved 2013-10-11.
^Sherwood, Larry (August 2012). "U.S. Solar Market Trends 2011"(PDF). Interstate Renewable Energy Council (IREC). p. 17. Archived from the original(PDF) on 2012-09-06. Retrieved 2012-08-16.
^Sherwood, Larry (June 2011). "U.S. Solar Market Trends 2010"(PDF). Interstate Renewable Energy Council (IREC). Retrieved 2011-06-29.
^Sherwood, Larry (July 2010). "U.S. Solar Market Trends 2009"(PDF). Interstate Renewable Energy Council (IREC). Archived from the original(PDF) on 2010-09-25. Retrieved 2010-07-28.
^Sherwood, Larry (July 2009). "U.S. Solar Market Trends 2008"(PDF). Interstate Renewable Energy Council (IREC). Archived from the original(PDF) on 2009-11-23. Retrieved 2010-07-24.