Cumulus Marks Construction Milestone For Direct Nuclear Power-Supplied Data Center


By Rod Walton, EnergyTech Senior Editor

Talen Energy’s spinoff Cumulus Data is making significant construction progress on its new Pennsylvania data center that will be directly powered by nearby and carbon-free nuclear energy, the company said.

Cumulus reported that it’s completed the powered shell for phase one of its 48-MW data center in Susquehanna. The 300,000-square-foot facility is available for lease soon and includes numerous fiber optic routes in service.

The data center industry is one of the largest energy demand users in the world, as servers require vast amounts of electricity operating usually all day, every day. This Cumulus facility will be unique in that it will be directly connected to electricity generated from Talen’s Susquehanna nuclear power station.

Nuclear reactors do not emit carbon dioxide or other greenhouse gases during the generation process. Plant operations costs can be high, but fuel rods are considered high in energy density, high-percentage capacity factor and low in relative economic costs once in use.

“Our flagship Cumulus Susquehanna data center campus is positioned to welcome its first tenant and commence commercial operations this year,” said CEO Alejandro Hernandez in a statement. “We look forward to advancing our mission to solve the energy ‘trilemma’ which we define as the rapidly increasing consumer demand for zero-carbon, low-cost, and reliable electricity by data center customers, beginning with our first Cumulus Susquehanna data center campus.”

Talen Energy, a spinoff of utility holding company PPL Corp. years ago, is owner and operator of the two-unit Susquehanna Nuclear Station. The power plant was commissioned in the early 1980s and utilizes two General Electric boiling water reactors.

Susquehanna Nuclear generates close to 20 million MWh of carbon-free power annually. Nuclear power accounts for 20 per cent of all US electricity resources and generates more than half of the nation’s carbon-free utility-scale energy.

The direct connection helps offer a lower total cost of ownership when energy costs are factored in, a company officer pointed out. Data Halls 1 and 2 are expected to ready for service in the third quarter.

The data center should be energized during this quarter, according to reports.

Many industry experts argue that directly connected nuclear is advantageous for the data industry, which consumes 8,000 GWh (8 million MWh) annually for disk storage alone. Some certainly say that renewable energy is a more viable, attractive option, but the value of carbon-free is a tremendous consideration all around.

“I feel strongly that nuclear power could be an alternative power option for many dense data center markets,” chief technical officer of South Carolina-based edge colocation data-center owner DartPoints, Brad Alexander said in a Q&A with EnergyTech sister publication Data Center Frontier last year. “Power purchase agreements for densely populated data center areas could be a very attractive option that would provide ongoing sustainable nuclear power to many providers in metro regions.”

Cumulus Data hopes to pioneer the nuclear direct-connection data center with the Pennsylvania project, then explore opportunities to duplicate that in other regions of the US.

The nation has 92 nuclear reactor units at more than 50 power plants in 28 states, according to the US. Energy Information Administration. Some countries, including France and several eastern European sovereigns, generate more than half of their total electricity from nuclear power plants.

  • Walton, senior editor for EnergyTech, is a 15-year veteran of covering the energy industry both as a newspaper and trade journalist. He can be reached at

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