Despite their commitments, utility companies are losing momentum in diversifying their energy portfolio with cleaner sources. That’s according to a new scorecard from a leading environmental group, which gives a North Dakota utility a failing grade.

The Sierra Club’s latest “Dirty Truth” report grades 75 utilities across the country based on their plans to retire coal plants, their alternatives for new gas plants and their overall transition to clean energy. It says Basin Electric Power Cooperative is still too reluctant to make a noticeable switch, no matter the pledges it’s made.

Todd Leake, executive committee chair with the Sierra Club’s North Dakota chapter, said he doesn’t like recent developments within this sector.

“This is blowing out of the water the whole path that we were taking forward with clean energy generation and retiring the coal plants,” he said.

For Basin Electric, the report criticizes the utility for securing recent approval of a new large gas plant. Leake worries about similar moves amid the push to build data centers. Basin officials did not respond to a request for comment.

Nationally, the Trump administration is pushing to extend the life of fossil fuel plants scheduled for closure, even with analysts warning about the bigger costs for ratepayers.

Wind energy has gained a stronger footing in North Dakota, and industry experts often argue the power source is more affordable for customers compared to fossil fuel plants. Leake wants to see more scrutiny of data centers, noting their rapid expansion complicates current planning.

“Why this one particular industry has a total carte blanche to go and consume as much electricity as it wants, to the detriment to everyone else,” he said.

Supporters of keeping coal and natural gas as part of the energy mix warn that data centers are pushing electricity demand even higher, and that cleaner sources can’t meet that demand alone. The Sierra Club says this year is the first time the aggregate score for all utilities dropped below the inaugural report.