Data Center Gas Plans Could Lift US Power Emissions, BNEF Warns

What BNEF is seeing

The artificial intelligence buildout is pushing data center developers to hunt for electricity faster than the grid can supply it, so more are proposing their own gas-fired plants on site. Many of these units are intended as temporary bridges until a grid interconnection arrives, but BNEF cautions that once these plants start up, economics could keep them running and effectively lock in fossil power for years.

"The grid performs well on reliability and cost and sustainability, but it has a major weakness: It fails on speed, and that's the one thing we care about today," said Musfika Mishi, an associate who focuses on data centers and emerging technologies at BloombergNEF, speaking at the BNEF Summit in Houston.

The emissions math and the pipeline's size

According to BNEF, about 181 gigawatts of gas-fired capacity is being contemplated for co-location at data centers, and over 90% of that queue sits in the US. For scale, the group notes that 1 gigawatt is about the capacity of a conventional nuclear reactor. The queue spans a wide range of project maturity and timing, and BNEF frames it as a measure of potential size rather than a forecast.

On emissions, BNEF finds that building all the announced on-site gas for US data centers would lead to around 345 million metric tons of CO2-equivalent each year. That total is 152 million tons higher, or 10% more, than the 2025 emissions that would result if the same data center capacity used average US grid power.

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How grid fixes could change the path

To hasten interconnections, grid operators are streamlining application processing and moving to permit flexible transmission service. With such flexible setups, data centers could shift computing to off-peak periods or curb demand from the grid by using backup generators. Even if that backup is diesel, BNEF says the flexible approach results in fewer emissions than operating on-site gas continuously.

Why it matters for your portfolio

The through-line is speed. If interconnections improve, on-site gas could stay a stopgap; if not, investors should expect longer-lived fossil assets attached to digital infrastructure. Watch the pace of grid reforms, the share of projects that actually get built from the 181 gigawatt pipeline, and how operators use flexible service - these will shape power demand, fuel mix, and emissions trajectories tied to AI data center growth.

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