Bloom Energy vs. Constellation Energy: On-Site Power or Grid Power, Which Wins the Data Center?

According to the International Energy Agency (IEA), global data center electricity consumption is projected to roughly double by 2030, reaching approximately 945 terawatt-hours (TWh), while Goldman Sachs forecasts a 165% jump in power demand by the end of the decade, compared to 2023 levels.

This push for power has put energy providers in the spotlight, from power equipment providers like Bloom Energy (BE -3.60%) to utility power producers like Constellation Energy (CEG +2.79%).

The choice between Bloom Energy and Constellation Energy boils down to one question: Do hyperscalers prefer on-site, “behind-the-meter” power solutions or baseload utility-scale grid power for their data centers? Here’s who data centers are going with.

Image source: Getty Images.

Bloom Energy helps data centers get power quickly

Bloom Energy’s biggest advantage for technology companies seeking on-site solutions is its time-to-power advantage. For many data center developers, the biggest bottleneck is interconnection wait times. It can take up to seven years or more in constrained energy regions.

Bloom’s solid-oxide fuel cells have become a popular solution after the company in 2025 delivered to Oracle‘s data center in just 55 days, well ahead of its 90-day target. This led to a massive deal with Oracle, which the companies expanded upon earlier this year.

On top of that, Brookfield Asset Management, another major data center developer, expanded its financing framework with Bloom Energy fivefold, from $5 billion to $25 billion, earlier this year.

Constellation Energy is the largest nuclear operator in the U.S.

Constellation Energy’s advantage is its massive nuclear energy fleet, the largest in the United States, and its merchant power producer business model. For technology companies looking to reduce carbon emissions while meeting growing electricity demand, nuclear energy has emerged as a popular solution.

Constellation is structuring its deals with hyperscalers through power purchase agreements (PPAs) that provide long-term revenue for Constellation while data centers secure long-term power.

Regulators have scrutinized deals by power producers, primarily concerned that residential customers will have to foot the bill for rising electricity costs and power grid build-out. To address these concerns, Constellation is bringing new energy capacity online, including  Three Mile Island Unit 1 as part of its deal with Microsoft, to reduce strain on the grid. It has similar arrangements in place with Meta Platforms, Amazon, Alphabet, and Walmart.

Bloom Energy vs. Constellation Energy: Which is the better investment?

Technology companies are leaving no stone unturned in their search for power solutions, benefiting both Bloom and Constellation. 

Bloom Energy offers higher upside potential, especially in the next few years as data centers scramble to install on-site power for data centers coming online. That said, its solid-oxide fuel cells use natural gas (with the option for hydrogen), which still produces emissions and is viewed as a bridge fuel.

Constellation Energy is a better long-term play, given its massive nuclear energy fleet and long-term agreements with major technology companies. For investors seeking a long-term stock poised to benefit from growing energy demand in the coming decades, Constellation is an excellent choice.