Connecticut Regulators Propose Slashing Carbon Allowances Under RGGI Through 2037

DEEP wants to cut the pollution allowances power plants can buy each year by roughly 60 to 90 percent by 2037, a move that could reshape electricity costs and grid investment across Connecticut.

What DEEP is actually proposing

The Regional Greenhouse Gas Initiative, or RGGI, is the cap-and-invest program that Connecticut and ten other Northeast and Mid-Atlantic states use to limit carbon dioxide emissions from power plants larger than 25 megawatts. Every quarter, DEEP auctions off a fixed number of pollution allowances, and any generator that burns fossil fuel to make electricity has to hold enough allowances to cover its emissions. The fewer allowances the state issues, the more expensive it becomes to run a coal, oil, or gas-fired plant, which is the entire point of the program.

DEEP's newly proposed rule would shrink that annual allowance budget dramatically. The cap sits at about 4.1 million allowances for 2026. Under the draft rule, it would drop to roughly 3.7 million in 2027 and keep declining every year after that, landing at approximately 393,000 allowances by 2037. That is a reduction of somewhere between 60 and 90 percent depending on how you measure it against different baseline years, and it would be one of the steeper tightening schedules RGGI has adopted since the program launched in 2009.

Why allowance prices matter to your electric bill

RGGI allowances are not a flat fee. They are auctioned, and prices move with supply and demand like any commodity. At the program's very first auction in 2008, an allowance sold for $3.07. By June 2026, that price had climbed to roughly $35, an increase of more than 1,000 percent over eighteen years. Generators generally pass at least part of that cost through to wholesale electricity prices, which eventually shows up on customer bills as part of the supply charge.

A tighter cap means fewer allowances are available at each auction, and basic economics says that scarcity tends to push the clearing price up further. DEEP and supporters of the plan argue the added cost is modest compared to the value of cutting emissions and funding efficiency programs, but any electrician who has fielded a customer's questions about a rising bill knows the math eventually lands on the homeowner's kitchen table either way.

Where the money actually goes

DEEP says the program has returned about $627 million to Connecticut since 2009. Roughly $338 million of that has funded energy efficiency work, over $100 million has supported Green Bank clean-energy financing along with EV purchase incentives, and another $117 million has gone straight toward lowering ratepayer bills. DEEP senior policy advisor Bruce Ho has said continuing to tighten the cap is necessary for Connecticut to keep its seat at the table as a participating RGGI state.

In practice, that means the state's Energize CT efficiency programs and the Connecticut Green Bank both draw on RGGI dollars to fund rebates for insulation, heat pumps, and renewable energy projects. Homeowners who have used a Home Energy Solutions audit or a Green Bank solar loan have already touched RGGI money without necessarily knowing it.

What a tighter cap could mean for the grid

A steeper allowance cap is designed to push utilities and independent power producers to retire older fossil fuel plants faster and lean harder on renewables, storage, and efficiency instead. For a state like Connecticut that already imports a significant share of its electricity from the regional grid, that shift plays out mostly in wholesale markets rather than in local generation, but it still affects reliability planning for the whole ISO New England region.

For homeowners and small businesses, the practical takeaway is less about the regulatory mechanics and more about the trend line: electricity prices tied to carbon policy are more likely to rise than fall over the next decade, which makes investments that reduce a home's exposure to volatile supply prices, such as battery storage, rooftop solar, and efficient heat pumps, more valuable over time rather than less.

What homeowners and business owners should do now

You cannot change RGGI policy from your living room, but you can control how exposed your home or business is to the price swings it creates. The most direct lever most people have is reducing overall electricity consumption and shifting what usage remains toward times when supply is cheaper and cleaner, which is exactly what time-of-use rate plans and smart panel technology are built to do.

If your home still runs on an older fossil-fuel heating system, a licensed electrician can walk you through what a panel upgrade or subpanel would take to support a heat pump or EV charger, both of which qualify for Energize CT and federal incentive programs funded in part by these same carbon programs. It is worth having that electrical capacity conversation before a compressor or furnace fails and forces a rushed decision.

• Ask your electrician for a load calculation before committing to a heat pump or EV charger so your panel can handle it
• Check your eligibility for Energize CT rebates on efficiency upgrades, which are partly funded by RGGI proceeds
• Consider a home energy audit to identify the cheapest ways to cut consumption before adding new electric loads
• If you are comment-minded, DEEP's public comment period on this proposal runs through August 3, 2026

5 things to know about RGGI before you read your next electric bill

The Regional Greenhouse Gas Initiative shapes electricity costs in ways most homeowners never see directly. Here is a quick primer.

1. It only applies to big power plants: RGGI covers fossil-fuel generators of 25 megawatts or larger, not homes or small businesses directly.
2. Eleven states participate: Connecticut, Delaware, Maine, Maryland, Massachusetts, New Hampshire, New Jersey, New York, Rhode Island, Vermont, and Virginia all take part in the regional cap-and-invest program.
3. Allowances are auctioned quarterly: Generators buy what they need at auctions held four times a year, and prices move with supply and demand.
4. Revenue funds efficiency, not just bureaucracy: Most Connecticut RGGI proceeds flow into Energize CT efficiency programs and Connecticut Green Bank renewable energy financing.
5. The cap has been tightening for years: RGGI states have periodically ratcheted the cap down since 2014; this proposal continues that trend through 2037.
6. Public comment closes August 3, 2026: Residents can submit comments to DEEP before the rule is finalized.

Frequently asked questions

Will this raise my electric bill right away?

Not immediately. The proposed cap changes phase in starting in 2027, and any price effect on wholesale electricity moves gradually through supply charges rather than as a sudden jump.

Does RGGI apply to my home's furnace or generator?

No. RGGI only regulates fossil-fuel power plants of 25 megawatts or larger that sell electricity into the grid, not residential appliances or backup generators.

Where can I see how RGGI money has been spent in Connecticut?

Connecticut DEEP publishes RGGI auction results and allocation reports, and Energize CT and Connecticut Green Bank both detail the efficiency and renewable programs funded in part by RGGI proceeds.

What can I do if I want to comment on the proposal?

DEEP's public comment period on the proposed allowance cap runs through August 3, 2026; comments can be submitted through DEEP's rulemaking docket.