Google Signs a Major Nuclear Power Deal With Constellation Energy, and the Stock Jumps 12%: What AI's Power Hunger Means for Investors and Your Electric Bill

Big tech companies are racing to lock in electricity for artificial intelligence, and that race is starting to touch both investment portfolios and power bills.

Constellation Energy, which says it runs the largest fleet of nuclear power plants in the U.S., announced a long-term deal with Google on Tuesday, Oct. 6. Constellation's stock rose 12.3% that day, according to TheStreet.

What the deal includes

According to Axios and SiliconANGLE:

• Constellation will invest $4.3 billion to upgrade 11 nuclear reactors at six plants in Illinois, Pennsylvania and New Jersey.
• The upgrades are expected to add 890 megawatts of new power. Google agreed to buy that power under a 20-year agreement.
• Google will also buy about 2,700 megawatts from Constellation's existing plants under a separate 15-year deal, SiliconANGLE reported.
• The new power is expected to reach the grid in phases from 2028 through 2032.

A megawatt is a unit of electric power. For a sense of scale, 890 megawatts is roughly what one large nuclear reactor produces.

The upgrades include new turbines, modern steam generators and digital control systems, according to SiliconANGLE. The power will feed into PJM Interconnection, the grid operator for a large part of the Mid-Atlantic and Midwest.

"As electricity demand grows in the U.S., the fastest new megawatt is often the one that can be provided by existing infrastructure," said Amanda Peterson Corio, Google's global head of data center energy, according to SiliconANGLE.

Why tech giants want nuclear power

AI tools run in huge buildings full of computers called data centers, and they use enormous amounts of electricity. Nuclear plants run around the clock and don't burn fossil fuels, which makes them attractive to tech companies.

Upgrading existing reactors is usually faster and cheaper than building new ones, Axios noted. Google isn't alone: Amazon, Meta and Microsoft have all signed nuclear power deals, several of them with Constellation, according to Axios.

What it could mean for your electric bill

Many families worry that data centers will drive up power prices. Constellation said the Google agreement gives it the revenue certainty to make the upgrades "without having to increase costs to consumers," according to SiliconANGLE.

Still, overall demand for electricity is rising. In its outlook released the same day, the U.S. Energy Information Administration said it expects wholesale electricity prices to average 11% higher in 2026 than in 2025. Your own bill depends on your utility, your state's rules and how much power you use.

What this means for your wallet

• You may already own it: Constellation is in the S&P 500. If you own an S&P 500 index fund through a 401(k) or brokerage account, you likely own a tiny slice of the company, and of Google's parent, Alphabet.
• Be careful chasing big jumps: A one-day gain of 12% can be exciting, but single stocks can also fall sharply. Spreading your money across many companies with low-cost index funds may reduce that risk.
• "Boring" sectors can grow: Utilities and power producers were once seen as slow, steady investments. AI demand has made some of them more volatile, so check how much of your portfolio sits in any one area.
• Watch your own usage: You can't control wholesale prices, but simple steps like adjusting your thermostat and switching to LED bulbs may help keep your bill in check.

Which plants are getting upgraded

The 11 reactors sit at six Constellation plants: Braidwood, Byron, LaSalle and Quad Cities in Illinois, Limerick in Pennsylvania and Salem in New Jersey, according to NeutronBytes. The work is called an uprate: instead of building a new plant, the company squeezes more output from reactors that already exist by replacing major equipment. The first uprate is expected by 2028, with all 890 megawatts online by the end of 2032, Power Magazine reported.

The separate 15-year agreement covers about 2,700 megawatts from Constellation's existing plants. That part adds no new power to the grid; it locks in who buys output that was already being produced.

Why customers in the PJM region are paying attention

All six plants feed PJM, the grid that serves all or part of 13 states and Washington, D.C. It has also become one of the busiest data center markets in the country. In its October outlook, the EIA forecast wholesale power prices across the 11 hubs it tracks to average about $52 per megawatt-hour in 2026, roughly 11% higher than in 2025, with the PJM hub up about 41%.

Wholesale prices don't pass straight through to your bill, but they matter over time. The EIA expects the average U.S. residential electricity price to rise from about 17.3 cents per kilowatt-hour in 2025 to about 18.2 cents in 2026, an increase of roughly 5%. For a household using 900 kilowatt-hours a month, that difference works out to about $8 a month, or close to $100 a year.

Related reading: Index funds explained, how to save on utility bills year-round and why AI stocks have been swinging this month.