Perhaps similar to the way that conservatives give more to charity than liberals despite liberals claiming the moral high ground of "compassion," Republicans buy energy-efficient appliances, use "smart meter" technology, and other energy-efficient behaviors at rates equal to or higher than Democrats, with this graph via Scientific American:
.
Progressives might find this cognitively dissonant, but it's pretty logical: conservatives think that private individuals are better at doing societal good than central government and bureaucrats. Republicans believe in private action, not mandates.