Overview
Connecticut’s power infrastructure is anchored by the Millstone nuclear plant, which is seeking license renewal to operate through mid-century. The state is adding clean energy through offshore wind contracts and competitive solar procurements, while managing transmission upgrades across Eversource’s system. One data center developer has proposed a direct connection to Millstone’s nuclear output, the only named data center power deal in the state.
Generation Projects
Nuclear
Dominion Energy plans to file subsequent license renewal applications for Millstone Units 2 and 3 by the end of 2027. The current licenses expire in 2035 (Unit 2) and 2045 (Unit 3).[2]
NE Edge has proposed a 300 MW data center campus on Millstone’s property with a direct connection to the nuclear plant — a bespoke supply arrangement rather than a traditional utility contract.[3]
Solar
Connecticut selected 518 MW of new solar generation through 2024 competitive procurements. One project (Solar Nursery, 200 MW) is in Connecticut; the other two are in Maine but contracted to serve Connecticut’s electric distribution companies.[4]
Wind
Revolution Wind is a 704 MW offshore wind project under construction, expected to reach commercial operation in 2026. Connecticut’s contracted share is 304 MW. The state reports the project is 80% complete and includes it in near-term reliability planning for ISO-NE.[5]
Natural Gas
The Killingly Energy Center, a 650 MW natural gas plant approved by the Connecticut Siting Council in 2019, was never built. The approval remains a constraint on the site, which is now entangled with a proposed battery project.[1]
Transmission and Grid
Eversource is managing several active transmission rebuild and relocation projects, including Norwalk Bridge Transmission Relocation, South Naugatuck to Beacon Falls Rebuild, Towantic to Beacon Falls Junction Rebuild, Underground Cable Modernization, and West Devon Junction to Devon Substation Rebuild.[6]
The state’s 2024 clean-energy selections note plans for a regional transmission procurement in 2025 to advance projects with regional reliability and affordability benefits.[4]
Battery Storage
Connecticut selected a 200 MW grid-scale storage project (Jupiter Power, Naugatuck Avenue) in its 2024 procurement. Contracts are expected to be filed with the Public Utilities Regulatory Authority (PURA) for review.[4]
A $200 million battery storage project is proposed in Killingly on a site with a 345 kV interconnection, but it is delayed because a prior gas plant certificate has not been surrendered — an example of siting and regulatory friction even for storage.[1]
Data Center Power Agreements
The NE Edge proposal at Millstone is the only data center-specific power deal in Connecticut that appears in public sources. It calls for a direct power connection from Millstone’s nuclear units to a 300 MW data center campus.[3]
State procurement contracts for solar, storage, and offshore wind are with Eversource and United Illuminating. No Connecticut-based PPA (power purchase agreement) with a major tech company was found in the public record.[4]
Interconnection Queue
ISO-NE (the regional grid operator) is implementing FERC Order No. 2023, which replaces the first-come, first-served queue with first-ready, first-served cluster studies to address interconnection backlogs. This will shape the timing and cost of new generation and storage projects in Connecticut.[7]
ISO-NE maintains a public interconnection request queue and related study materials for projects across New England.[8]
ISO-NE testimony cited by the state notes that offshore wind provides winter reliability benefits by offsetting natural gas pipeline constraints, an ongoing system bottleneck for the region.[5]
What to Watch
- Millstone subsequent license renewal applications, expected by the end of 2027.
- NE Edge’s proposed 300 MW data center campus and direct nuclear connection — regulatory review and feasibility.
- Regional transmission procurement in 2025 and its impact on Connecticut’s interconnection capacity.
Sources
[1] Lisa Prevost, “Legal Snafu Over Canceled Natural Gas Plant Site Ensnares Connecticut Energy Storage Project,” CT News Junkie (Energy News Network), 2025-01-14, https://ctnewsjunkie.com/2025/01/14/legal-snafu-over-canceled-natural-gas-plant-site-ensnares-connecticut-energy-storage-project/ (accessed 2026-01-08).
[2] Dominion Energy Nuclear Connecticut, Inc., “Millstone Power Station, Units 2 and 3 - Intent to Pursue Subsequent License Renewal,” letter to U.S. Nuclear Regulatory Commission, 2023-12-20, https://www.nrc.gov/docs/ML2336/ML23361A031.pdf (accessed 2026-01-08).
[3] Andrew Brown, “Proposed data center would get power from Millstone nuclear plant,” CT Mirror, 2024-01-19, https://ctmirror.org/2024/01/19/millstone-power-plant-ct-data-center-nuclear/ (accessed 2026-01-08).
[4] Connecticut Department of Energy and Environmental Protection (DEEP), “Connecticut Announces Clean Energy Selections,” 2024-12-20, https://portal.ct.gov/deep/news-releases/news-releases---2024/connecticut-announces-clean-energy-selections (accessed 2026-01-08).
[5] Connecticut Department of Energy and Environmental Protection (DEEP), “DEEP Stoppage of Revolution Wind Project Will Increase Costs for CT and New England Ratepayers, Make Grid Less Reliable,” 2025-09-09, https://portal.ct.gov/deep/news-releases/news-releases---2025/deep-stoppage-of-revolution-wind-project-will-increase-costs-for-ct-and-new-england-ratepayers-make (accessed 2026-01-08).
[6] Eversource Energy, “Major Connecticut Projects,” https://www.eversource.com/residential/about/transmission-distribution/projects/connecticut-projects (accessed 2026-01-08).
[7] ISO New England, “Order No. 2023 Key Project,” https://www.iso-ne.com/committees/key-projects/order-no-2023-key-project (accessed 2026-01-08).
[8] ISO New England, “Interconnection Request Queue,” https://www.iso-ne.com/system-planning/interconnection-service/interconnection-request-queue/ (accessed 2026-01-08).