NEW YORK, June 20, 2026, 17:01 (EDT)
- Constellation Energy rose 8.0% for the holiday-shortened week, closing Thursday at $274.06.
- U.S. exchanges were shut Friday for Juneteenth and remain closed for the weekend.
- The next test is whether new grid rules and project approvals turn AI power demand into cash flow.
Constellation Energy shares ended a holiday-shortened U.S. trading week sharply higher, helped by a fresh federal push to speed electricity connections for large AI data centers and by renewed buying in power producers tied to the data-infrastructure trade. The stock closed Thursday at $274.06, up 2.58% on the day and 8.0% from its June 12 close.
That matters now because there was no Friday session. The New York Stock Exchange closed on June 19 for Juneteenth, leaving Thursday’s tape as the market’s last mark before the weekend. Constellation outpaced the S&P 500’s 1.08% rise that day, while volume of about 7.0 million shares ran at roughly twice its 50-day average, MarketWatch data showed.
The rally still leaves the stock well below last year’s peak. Constellation remains about 33.6% under its 52-week high of $412.70, reached on Oct. 15, a reminder that investors have been willing to pay for the nuclear-and-AI story, but not without pulling back hard when timelines or regulation look less certain.
The immediate policy hook came from the Federal Energy Regulatory Commission. On June 18, FERC ordered six regional grid operators to justify or reform tariffs — the market rulebooks and charges that govern grid access — for data centers and other large energy users. In plain terms, regulators are trying to shorten the line for customers that need huge amounts of power, while deciding who pays for the wires and upgrades.
The market read-through is straightforward. Constellation owns large blocks of always-available power, including the biggest U.S. nuclear fleet, and investors are treating faster grid access as a possible bridge between AI demand and contracted revenue. The trade was not limited to Constellation: Vistra rose 3.1% and NRG Energy gained 2.2% in the latest regular session, keeping peers with wholesale-power exposure in the same lane.
Constellation also has a larger base to sell from after completing its Calpine acquisition in January, a deal the company said created the nation’s largest producer of electricity. In May, the company reported first-quarter adjusted operating earnings — profit excluding some items — of $2.74 a share and affirmed full-year 2026 adjusted earnings guidance of $11 to $12 a share.
“America needs reliable, clean power,” CEO Joe Dominguez said when the company reported first-quarter results, adding that Constellation was built to meet that demand. The line captures the bull case, but also the burden on the company: it has to integrate Calpine, keep plants running well and turn regulatory momentum into actual deliveries. Constellation
Analysts have framed the same point in stock terms. Melius Research analyst James West said Constellation was “well-positioned to supply rapidly growing data center demand in 2026,” citing its expanded natural-gas and ERCOT exposure after Calpine. ERCOT is Texas’ main power grid, an important market because data-center developers are trying to secure both land and electricity there. Reuters
Texas added another reason for investors to keep watching. State regulators approved ERCOT’s “Batch Zero” process on June 18 to study large-load projects of at least 75 megawatts together, with Reuters reporting that ERCOT is reviewing more than 438,000 megawatts of large-load requests, about 89% of them from data centers. That is a huge number, and not all of it will be built. Still, it shows why the market keeps circling back to power supply. Reuters
The week ahead will likely turn on whether the AI-power trade can hold its gains without fresh deal news. Investors are also watching Constellation’s plan to restart the former Three Mile Island Unit 1, now the Crane Clean Energy Center, after FERC this month granted a waiver allowing certain grid rights to move from the Eddystone gas plant to the nuclear site. Constellation has said it wants to restart Crane next year.
But the setup can cut both ways. Faster data-center connections may help power suppliers, yet regulators are also focused on shielding households and businesses from higher grid costs; if upgrades take longer, customers resist prices, or Crane slips, Constellation’s multiple could come under pressure again. At this price, the stock is no longer trading like a forgotten utility. It is trading like an execution story.
