Eversource Opposes Connecticut Data Centers Citing Energy Constraints

This blog post digs into the crossroads Connecticut faces as Eversource raises some strong warnings about large data centers. The utility argues these projects could bump up electricity prices and put extra stress on the regional grid, even though the state keeps attracting hyperscale developers thanks to its solid electric infrastructure and those fiber connections running between New York and Boston.

From Hartford to Greenwich, the debate is heating up. State regulators, utility execs, and communities are all weighing jobs and investment against protecting ratepayers and keeping the grid reliable.

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Eversource’s warning: hyperscale data centers and grid stress

Eversource CEO Joe Nolan says the utility is pushing back against hyperscale data centers—the kind that demand 100 MW or more. He thinks they could drive up energy prices for homes and small businesses.

The company’s not shy about resisting a wave of proposed loads. They argue these centers clash with a grid built for more steady, distributed usage throughout the day.

Jacob Lucas, Eversource’s VP of transmission and system planning, adds that these huge loads could overload transmission lines, hike up wholesale energy costs, and even outpace what power plants can reliably produce. The numbers are hard to ignore: the International Energy Agency says data centers used about 1.5% of global electricity in 2024, and that demand could more than double by 2030. Lucas calls it a “tidal wave.”

Eversource has reviewed proposals totaling between 2,000 and over 5,000 MW of data-center load, but so far, only smaller campuses have gotten the green light. These concerns aren’t just theoretical—big, concentrated loads can trigger voltage-sensitive failures.

Other regions have already seen outages tied to computational loads, with regulators issuing alerts. It’s a real risk when you cluster massive power demand in just a few spots.

Impacts a single center could have on the grid and costs

A single large center could take over the full output of an 800 MW plant in southwest Connecticut.
Concentrated demand would likely push up wholesale energy prices, which means higher residential bills too.
Accommodating these loads would require expensive transmission upgrades, like rebuilding lines that just can’t handle it.
During extreme weather, like heat waves, demand could spike past New England’s all-time electric peak and available generation.

Connecticut’s data center appeal: infrastructure and a strategic location

Even with all these headaches, Connecticut still draws developers. Its strong electric infrastructure and proximity to fiber-optic trunk lines connecting New York and Boston make it a hot spot.

Interest really picked up in early to mid-2024, with developers eyeing multiple sites around the state and nearby regions.

Stamford, Norwalk, and Bridgeport sit right on key corridors where developers see opportunities for efficient cooling and fast, low-latency connections. New Haven and Waterbury keep coming up in talks about mid-sized campuses.

Danbury and Greenwich also get a lot of attention, thanks to their proximity to major fiber routes and a solid local workforce. Connecticut’s mix of urban centers and suburban hubs—plus access to interstate power markets—keeps developers interested, even as Eversource and regulators urge caution.

What this means for ratepayers and system upgrades

Homeowners and small businesses worry about the ripple effect: higher wholesale prices, pricier transmission upgrades, and potential reliability headaches if big campuses throw the generation balance off. Regulators and utility planners talk about careful site selection, phased development, and beefed-up transmission planning to keep things under control while still chasing growth and jobs.

Bulk-load centers could shift costs and speed up the need for grid upgrades in places like Hartford and New Britain.
Smaller, well-placed data centers might be easier to manage, balancing reliability and economic growth.
Ongoing conversations among municipalities—from Stamford to Greenwich, and New Haven to Danbury—are crucial for keeping public interests and private investment aligned.

Regions to watch: Connecticut towns shaping the data-center debate

Local leaders all over Connecticut are watching closely as large-scale computing facilities could shake up local power costs and infrastructure. These communities come up again and again in planning talks and regulatory filings:

Hartford
New Haven
Stamford
Norwalk
Bridgeport
Waterbury
Danbury
Greenwich
Bristol
Middletown
New Britain

Voices from the field: regulators and utility insiders

Industry voices keep saying the status quo can’t mean doing nothing. Moving forward will probably take careful planning and ongoing grid-stability analyses.

There’s also a need for real collaboration from towns like Groton and Essex. That way, growth in the data-center sector doesn’t end up hurting reliability or stick Connecticut families with higher costs.

Looking ahead for homeowners and local businesses

The debate over data centers in Connecticut isn’t just about big numbers on a spreadsheet. It’s about trying to balance economic opportunity with ratepayer protection and grid reliability.

People in cities like Hartford, Glastonbury, and Old Saybrook feel these day-to-day realities. As regulators, utilities, developers, and municipal leaders keep talking, residents really should stay in the loop about how these choices might shape electricity bills and the local power scene for years to come.

Here is the source article for this story: Why Eversource is resisting interest in Connecticut data centers

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