Why tech companies are shopping for nuclear power for data centers

Tech companies are increasingly looking to directly connect data centers to nuclear plants as they race to secure clean energy to power artificial intelligence, sparking resistance from some utilities over the potential impact on the electric grid.

Data centers, the computer warehouses that run the Internet, in some cases now require a gigawatt or more of power, comparable to the average capacity of a nuclear reactor in the U.S.

The data centers are essential to U.S. economic competitiveness and national security as the country competes with adversaries such as China for supremacy in the race to develop AI, said Joe Dominguez, the CEO of Constellation Energy, which operates the largest nuclear fleet in the U.S.

“When you’re talking about large [demand] load that also wants to use zero-emission energy, you’re going to bring it very close to nuclear power plants,” Dominguez said on Constellation’s second-quarter earnings call Tuesday. Constellation, headquartered in Baltimore, operates 21 of the 93 reactors in the U.S.

Constellation’s shares have surged 58% this year, the sixth-best stock in the S&P 500, as investors attach a higher value to the company’s nuclear power capacity to meet the growth in data centers. Shares of Vistra Corp., based outside Dallas and owner of six reactors, have doubled this year, the second-best performing stock in the S&P after AI chipmaker Nvidia.

Tech companies are building out data centers just as power supply is increasingly constrained due to the retirement of coal plants and as demand is climbing from the expansion of domestic manufacturing and the electrification of vehicles.

The largest grid operator in the U.S., PJM Interconnection, warned in late July that power supply and demand is tightening as construction of new generation lags demand. PJM covers 13 states primarily in the Mid-Atlantic region, including the world’s largest data center hub in northern Virginia.

Constellation’s Dominguez argued that connecting data centers directly to nuclear plants, called co-location by the industry, is the fastest and most cost-effective way to support the buildout of data centers, without burdening consumers with the costs of building new transmission lines.

“The notion that you could accumulate enough power somewhere on the grid to power a gigawatt data center is frankly laughable to me — that you could do that in anywhere that doesn’t start with decades of time,” Dominguez said. “This is an enormous amount of power to go out and try to concentrate.”

In March, Amazon Web Services bought a data center powered by the 41-year-old Susquehanna nuclear plant in Pennsylvania from Talen Energy for $650 million . But the agreement to directly sell power to the AWS data…