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Google Just Bought 20 Years of Nuclear Power. The AI Trade Is Moving to the Grid.
Google signed for 890 megawatts of new nuclear output and 2,700 megawatts of existing supply from Constellation Energy. The AI shortage has moved from chips to memory to electricity. Here is what was signed, who holds pricing power, and what could go wrong.
The AI build was limited first by chips, then by memory. The next shortage is electricity, and this week one of the largest buyers on earth paid to lock it up. Here is what Google actually signed, who gets pricing power next, and what an investor should check before chasing the move.
HeyTheo Research · Thursday, October 8, 2026
Quick Read
On Tuesday, Oct 6, Google signed a 20-year deal for 890 megawatts of new nuclear output from Constellation Energy, plus a 15-year contract for 2,700 megawatts from Constellation's existing plants. Constellation will invest more than $4.3 billion in upgrades.
Constellation's shares rose about 12% on the day. Vistra rose about 8% and Talen about 7%, with no deal of their own.
The reason is a grid that is running short. In the largest US power market, the price of reserve capacity has risen more than 11 times in two years.
The risks are real: upgrades that slip, regulators reacting to higher household bills, and stocks that have given back deal-day gains before.
What Google actually signed
Most headlines ran with one number. The deal has three parts, and they matter differently.
Part | Size | Term | What it is |
|---|---|---|---|
New nuclear output | 890 MW | 20 years | Upgrades to 11 existing reactors in Illinois, Pennsylvania and New Jersey. First new output due by 2028 |
Existing supply | 2,700 MW | 15 years | Power from Constellation's current fleet in the same grid |
Technology | n/a | 5 years | Constellation adopts Google Cloud and its AI tools across its operations |
Source: Constellation Energy and Google announcements, Oct 6, 2026
Two details are easy to miss.
First, no new reactor is being built. The 890 megawatts come from "uprates": new turbines, steam generators and digital controls that squeeze more power out of plants already running. That is why the first output is due in about two years, where a new plant takes a decade or more.
Second, the cost. At $4.3 billion for 890 megawatts, the upgrades work out to roughly $4.8 million per megawatt. By our estimate that is about a third of what the last new reactors built in the US cost per megawatt. Uprates are the cheapest and fastest nuclear power available, and there is a limited amount of it.
Research cue · try it in HeyTheo Ask Theo for the bull case, bear case and what to watch on any power producer you follow, and add: "what changes if the plant upgrades slip by a year?" A long contract is only worth what gets delivered on time. Open HeyTheo
Why a search company is buying reactors' output
Because the grid it plugs into is running out of spare power.
Constellation's plants sit in PJM, the grid that serves 67 million people from Illinois to New Jersey. PJM runs a yearly auction to pay power plants for being available at peak times. The price in that auction is the cleanest gauge of how tight the system is.
Delivery year | Capacity price (per megawatt-day) |
|---|---|
2024/25 | $28.92 |
2025/26 | $269.92 |
2026/27 | $329.17 |
Source: PJM Interconnection capacity auction results
That is an 11-fold rise in two years. The most recent auction, for 2027/28, came up more than 6,600 megawatts short of the reserve target. It was the first system-wide shortfall in the grid's history.
Data centers are the main cause. The grid operator expects them to add 5 to 7 gigawatts of demand each year through 2032, against 2 to 3 gigawatts of new supply. Nationally, data centers use about 4% to 5% of US electricity today. One widely cited industry estimate puts that at 9% to 17% by 2030.
PJM has also changed its rules. Large new data centers are now pushed to bring their own new power supply or accept being cut off first at peak times. A long contract for new nuclear output is one way to meet that test. Google is buying electricity, and it is also buying its place in line.
The bottleneck keeps moving
This is the third stop for the same money.
The four largest cloud companies plan to spend about $725 billion on capital projects in 2026, up 77% from 2025. That spending hit a chip shortage first. Then a memory shortage, which we covered in our note on Micron's margins. Now it is hitting the power socket.
Each time, pricing power went to whoever owned the scarce input. In power, three groups hold different pieces of it.
Owners of existing firm power in tight grids. They can sign 15- and 20-year contracts with buyers who cannot wait. Their risk is execution and politics.
Makers of grid equipment. Turbines, transformers and switchgear are needed for every upgrade and every new plant. Their risk is the order cycle: backlogs look best right before they peak.
Regulated utilities. They earn a set return on what they build, so more wires and substations mean more earnings. Their risk is the regulator, and the interest rates we covered in our note on jobs, bonds and the Nasdaq. Utilities borrow heavily, and a 30-year Treasury at 5.70% raises the cost of every project.
Research cue · try it in HeyTheo
Build a basket of the power names you follow and split it three ways: power producers, equipment makers and regulated utilities. Track each group against a chip basket. If power keeps pace while chips stall, the market is repricing where the shortage sits. Open HeyTheo
What could go wrong
A 12% day invites chasing. Four things argue for doing the work first.
Deal-day gains have faded before. Even after Tuesday's jump, Constellation's shares are still down about 15% for the year, and this is not its first contract with a large technology buyer. A headline and an earnings stream are different things.
The neighbors rose on sympathy. Vistra and Talen gained 7% to 8% without signing anything. That is the market pricing in deals that do not exist yet.
Households are paying more. Higher capacity prices are expected to add $16 to $18 a month to residential bills across the region. When voters' bills rise because of data centers, regulators and legislators tend to respond. Price caps and new charges on large users are both live debates.
Upgrades have to be delivered. The first new output is due by 2028. Nuclear work has a long record of running late.
Research cue · try it in HeyTheo
Open the money-flow view and check whether money moved into utilities this week or only into a handful of names. Then set a trigger on the stocks that rose without a deal: "tell me if this gives back more than half of Tuesday's gain." It keeps a sympathy move honest. Open HeyTheo
Research it yourself: rules HeyTheo tracks
AI power basket. Power producers, grid equipment makers and regulated utilities tracked as three sleeves against the index and against chips.
Contract trigger. Flags any tracked power name that moves more than 5% on a contract announcement, then tracks whether the move holds ten trading days later.
Rate trigger. Flags when long-term Treasury yields make a new high. Utilities and other heavy borrowers tend to feel that first.
Ask Theo. Try: "Which of my holdings would be hurt most by higher electricity prices?" or "Give me the bear case for power producers if regulators cap capacity prices."
Check the rule behind any trigger before acting on it. You trade through your own broker; HeyTheo helps you decide.
The Switchyard
A switchyard is where a power plant meets the grid. It is the least glamorous part of the site and nothing leaves without passing through it.
The AI build has reached its switchyard. The chips exist and the memory is contracted. What decides the pace now is how many megawatts can be found, how fast, and at what price. Google's answer was to pay for twenty years of certainty.
For investors, the useful question is not which stock rose on Tuesday. It is who owns power that cannot be copied quickly, and what could stop them from being paid for it.
Start your own first pass. Download HeyTheo, add the power names you follow, and run the three cues above. Get the app
FAQs
What did Google and Constellation Energy agree to?
A 20-year contract for 890 megawatts of new nuclear output from upgrades to 11 existing reactors, a 15-year contract for 2,700 megawatts from Constellation's existing fleet, and a five-year technology partnership. Constellation will invest more than $4.3 billion.
What is a nuclear uprate?
It is an upgrade that raises the output of a reactor that is already running, using new turbines, steam generators and controls. It adds power faster and at lower cost than building a new plant.
Why are tech companies buying nuclear power?
Data centers need large amounts of steady power around the clock, and grids are running short. Long contracts for firm power secure supply and help meet new rules for connecting large users.
How much electricity do data centers use?
About 4% to 5% of US electricity in 2026. One industry estimate puts the figure at 9% to 17% by 2030.
What are the risks for power stocks tied to AI demand?
Upgrades can run late, regulators may act on rising household bills, higher interest rates raise financing costs, and stocks have given back deal-day gains before.
Sources
Constellation Energy, Google, PJM Interconnection, EPRI, Monitoring Analytics, Bloomberg, Quartz, Benzinga, 24/7 Wall St.
Disclaimer
Disclaimer: HeyTheo is a research and education platform, not an investment adviser or broker-dealer. Nothing here is advice to buy, sell, or hold any security. You trade through your own broker; HeyTheo helps you decide. Backtested results are hypothetical and do not guarantee future returns. References to governments, officials, or policies are for market context only and are not political endorsements. All investing involves risk, including loss of principal. Data is as of the dates noted.