New York is among nine states already cutting greenhouse gases from power plants that say proposed federal guidelines for future national reductions are welcome.
The Regional Greenhouse Gas Initiative, which sets pollution caps and requires using or buying credits to exceed them, says its states collectively have reduced carbon dioxide emissions from electrical generation by 40 percent since 2005.
However, the federal target by 2030 is another 44 percent cut for New York, based on 2012 pollution levels.
The emissions blamed for global warming come for burning fossil fuels, with coal the dirtiest, oil second and natural gas third.
Other reductions come from power plant efficiency, reducing consumption and adding solar and wind power.
New York officials say they are studying the 2,000-page federal proposal. They declined to immediately comment.