The development contrasts with 2025, when emissions from the US energy sector rose.
Reduced consumption of gasoline and diesel also contributes, while fossil gas use remains flat, according to Energy Innovation.
The institute estimates that emissions from the US energy sector will be 70 million tons lower this year than in 2025, a decline of about 2 percent.
Total carbon dioxide emissions from the US energy sector are estimated at 4.85 billion tons, based on federal statistics for January-July and forecasts for the rest of the year.
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