California regulators are expected to pass new rules today requiring that 15 percent of all new cars sold by 2025 be powered by electricity, hydrogen, or other reduced-emission sources. The new rules proposed by the California Air Resources Board would also require a 75-percent reduction in smog-creating emissions from new cars, SUVS, pickups and minivans, and a 50-percent reduction in emissions of carbon dioxide and other greenhouse gases by 2025. According to the board, the initiative would put about 1.4 million low-emission vehicles on California roads by 2025, compared with current levels of about 10,000. They predict the new rules will add about $1,900 to the price of a new car, but will save about $5,900 in fuel costs during the life of the vehicle. “This is a really large step. It’s transformational,” Tom Cackette, the board’s chief deputy director, told the San Jose Mercury News. “Ten years from now the market is going to look quite a bit different.” The new standards will be introduced in 2018 and strengthened over the next seven years.