“The federal government’s backsliding on standards for the next five years requires less fuel economy than what the U.S. fleet of new cars and trucks achieved in 2021. Rolling back fuel efficiency sta...

Xcel Energy has asked to intervene in a lawsuit challenging the Trump administration’s emergency order

Flares atop Suncor Energy’s Commerce City refinery are the state’s most significant source of volatile organic compounds, a recent report found.

“It is highly unusual that we have this many bear sightings. Period,” said Cherry Creek spokeswoman Abbe Smith. “It’s made for an interesting start to the school year.”

An energy company is backing out of a multimillion-dollar mineral rights deal with the Town of Erie after residents worked to put the agreement to a ballot vote.

The 438-acre facility is operated by Global AI and is facing strong community pushback.

“We have a lot of fears of what would happen should we not have anything in place,” Windsor Planning Commissioner John Neal said. “So I think we should push forward with as much information as we got ...

10th Circuit overrules US District Court and says environmental groups can seek tougher state action

Turning power plants on and off to generate electricity at a fraction of their capacity is costly, and inefficient, owners and analysts say

Read stories of how Moms Clean Air Force staff are coping as this latest round of climate-supercharged wildfire smoke disrupts our lives and our health.

Find seven resources for understanding and surviving heat domes and other extreme heat as our summers continue to get hotter.

Cherry Creek School District is part of a pilot to charge electric buses and send the power back onto the grid at peak demand times.

What's the status of building new data centers in Colorado, and will we see the massive projects in nearby states?

Investigation reveals regulator let firms off the hook on cleanup bonds despite backlog that will take decades to clear

Read testimony from Moms opposing the EPA proposal allowing polluters to begin new projects without public input or air pollution permits.

Holy Cross Energy in Glenwood Springs delivered 100% clean energy to its 45,000-plus members in March, a renewable power landmark for the cooperative.

The State of the Air 2026 report reveals that 152 million people in the U.S. live in areas failing basic air quality standards — and Hispanic communities are more than ...

Data centers are threatening Colorado communities. Without protections in place, they could increase electricity bills, use precious water resources and pollute our environment. Join advocates and c...

Plenty of families descended at the Westminster City Park Recreation Center on Saturday for a variety of events celebrating Earth Day. There was a chance to ride and drive an

“At the end of the day, (the) State Sunlight/Long (pad) achieves the balance we were told to look for,” Energy and Carbon Management Commission chair Jeff Robbins said.

Colorado's new air toxics regulations for five hazardous chemicals boosts the air pollution fight into a new category.

Suncor also reported that it may have released too much carbon monoxide from its Plant 2 fluidized catalytic cracking unit.

Join us in urging AI data centers to use clean energy instead of polluting the air with fossil fuels and endangering the health of our kids.

Yes. Renewable energy made up at least 43% of electricity generated in Colorado in 2025, U.S. Energy Information Administration data shows.

Environmental sacrifice zones like the Commerce City area are being forgotten as the state touts its overall success.

Environmental sacrifice zones like the Commerce City area are being forgotten as the state touts its overall success.