According to the complaint filed on Tuesday in U.S. District Court for the Northern District of California, the new standards would reduce carbon dioxide emissions by an estimated 26 million metric tons per year — the equivalent of shutting down at least six coal-fired power plants. The new standards could also save consumers at least $4.7 billion in energy costs by reducing electricity consumption by about 240 billion kilowatt hours— the annual electricity use of about 19 million homes -- over the next three decades.