Londonderry Township, Dauphin County
Constellation's restart of the 835 megawatt Three Mile Island Unit 1 reactor in Londonderry Township, Dauphin County, renamed the Crane Clean Energy Center, whose output Microsoft has agreed to buy for 20 years.
Constellation and Microsoft announced the 20-year power deal and the Crane Clean Energy Center name on September 20, 2024, with a 2028 target that Constellation later moved up to 2027. The NRC approved the name change on May 13, 2025 and Constellation filed its main license amendment requests between July and October 2025. DOE closed a $1 billion loan in November 2025. The NRC held public meetings on February 19 and July 28, 2026, offered a chance to request a hearing through April 27, 2026, published a draft environmental assessment on June 9, 2026, approved the receipt of new fuel on July 1, and issued its final environmental assessment and finding of no significant impact on September 18, 2026. Constellation asked FERC to transfer capacity interconnection rights from the retired Eddystone plant because PJM transmission upgrades could run to 2030 or 2031. The current license expires April 19, 2034.
Update, October 26, 2026. On October 2, 2026 Constellation answered the NRC's September 18 request for more information on reinstating the plant's emergency plan, according to the NRC's project page.
Constellation's Susquehanna River Basin Commission application seeks up to 73.2 million gallons a day from the river on a peak day, with up to 21 million gallons a day consumed, plus groundwater from three wells. Three Mile Island Alert argues the request is premature and ignores flooding and future uprates.
Three Mile Island AlertFEMA is reviewing offsite emergency plans for the 10-mile zone covering parts of Cumberland, Dauphin, Lancaster, Lebanon and York counties, and residents questioned evacuation of schools and nursing homes. The island already holds 46 spent fuel canisters from Unit 1, and speakers worried about storing waste on a flood-prone island.
Pennsylvania Capital-StarConstellation plans 600 permanent employees, 150 returning workers and 450 new hires, and refueling every two years will bring 1,500 to 2,000 temporary workers for several weeks.
Pennsylvania Capital-StarTactics: Formal comments to the NRC and DEP, testimony to the Susquehanna River Basin Commission, and a petition to intervene in the NRC licensing case.
Opposes the restart; its 2024 post is titled 'The case against restarting Three Mile Island's Unit-1.' Membership forms are on its site.
Amendment approving the rename of Three Mile Island Unit 1 to the Crane Clean Energy Center.
Constellation · IssuedCapacity Interconnection Rights transfer waiver request.
Constellation · PendingSeeks a hearing and the rejection or conditional approval of the license amendments Constellation requested to restore power operations.
Eric Joseph Epstein (petitioner); Constellation Energy Generation, LLC (licensee) · Filed; a ruling was not found as of October 22, 2026Surface water withdrawal of up to 73.2 million gallons a day (peak day) from the Susquehanna River, consumptive use of up to 21 million gallons a day, and small groundwater withdrawals from three wells.
Constellation Energy Generation, LLC (applicant); Three Mile Island Alert (opposed) · Public hearing held April 23, 2026; final action not confirmedFinal NEPA review for the restart licensing actions; the NRC found no significant environmental impact and did not require a full environmental impact statement.
NRC staff; Constellation Energy Generation, LLC · IssuedAllows receipt and possession of new nuclear fuel and new sealed neutron sources at the plant.
Constellation Energy Generation, LLC · Issued July 1, 2026In Pennsylvania, the local zoning ordinance sets the route. A conditional use is decided by the elected governing body (supervisors, commissioners or council). A special exception or variance, and an appeal of a zoning officer’s decision, go to the Zoning Hearing Board. Each is a public hearing on a record: affected neighbors can ask for party status, cross-examine witnesses, and appeal. Municipalities can also adopt data center ordinances with enforceable standards.
Know your rights →Organized community opposition is the single most effective check on these projects in Pennsylvania. Show up to hearings, submit comment when it is taken, support legal and expert-witness costs, and press your municipality for a real ordinance. Pennsylvania municipalities cannot simply freeze applications, but a curative amendment under the Planning Code gives them a defined window to fix a defective ordinance.
How communities push back →