ACEEE, Sept. 26, 2016.
http://aceee.org/sites/default/files/publications/researchreports/u1606.pdf

"This tenth edition of the State Energy Efficiency Scorecard measures the progress of state policies and programs that save energy while also benefiting the environment and promoting growth. We use data vetted by state energy officials to rank states in six categories—utility programs, transportation, building energy codes, combined heat and power, state initiatives, and appliance standards."