Billings Gazette: With some of the lowest-priced electricity in the country — energy efficiency has long been an afterthought in Montana’s coal-dominated economy. But now, with unemployment doubling over the past three years and gross domestic product growing at a meager 1.8 percent, Montana needs to maximize its assets in new ways. Sen. Max Baucus recognized this at his recent Montana Economic Summit, when he welcomed new ideas that “spark innovation, boost exports and create good-paying jobs.” Here’s an idea…