New Mexico was in the first wave of states to require gradually increasing amounts of renewable energy such as wind, solar and geothermal to power its electrical grid. Signed into law in 2004, the state’s Renewable Energy Act required private utilities to ensure that 20 percent of the electricity they provide to consumers comes from those sources by 2020. Since then, what was once a novel idea has gone mainstream. Twenty-nine states, the District of Columbia, and three territories have similar laws. More than half have higher goals than 20 percent.