“Renewable energy mandates” may sound good as a political talking point, but in practice, they mean higher prices for consumers. Yesterday, Minnesota Governor Tim Walz announced a proposal that his state mandate a shift to 100 percent clean energy by 2050. This would mean phasing out inexpensive energy sources for more expensive ones by government fiat, and the resulting costs would hit low-income families the hardest. One recent study from the Heritage Foundation found that “green” energy mandates like these threaten to double monthly electric bills, with residents of states with burdensome mandates paying “between 50 percent and 100 percent more on their electric…