California is again the nation’s leader in the realm of energy efficiency. This is even more impressive when we consider that California is the nation’s fourth largest producer of electricity and is the leading importer of electricity. The conclusions are by the American Council for an Energy-Efficient Economy. Improvements to energy efficiency include modernized building codes, energy-efficiency targets and advancement of energy-efficiency programs. Moreover, California is the undisputed leader in renewable energy production. However, Massachusetts has been rapidly gaining on California in the last several years by increasing investment in renewable energy and energy efficiency. The American Southwest made the biggest improvements in energy efficiency. New Mexico, Utah and Arizona are all climbing fast in the rankings. The region is quickly becoming the go-to area for energy efficiency in the country. The states in the Southwest are in the top half of states in terms of energy efficiency. Already 27 states have fixed energy-efficiency targets and these states account for over two-thirds of America’s electricity. This is double the number of states from four years ago. You can learn more about these states here.