Connecticut Utilities: Electricity and Natural Gas
Connecticut’s utilities provide essential services for both electricity and natural gas. While the utilities own and maintain the delivery infrastructure (wires, pipes, transformers), customers often have the option to choose their supply company for electricity and, in some cases, natural gas. Knowing who your utility is, how to contact them, and how to shop for supply rates is key to managing costs.

Major Electric Utilities in Connecticut
- Eversource Energy – The largest electric distribution utility in Connecticut, serving most of the state.
- Customer Service: 1-800-286-2000
- Emergency/Outages: 1-800-286-2000
- United Illuminating (UI) – Serves the greater New Haven, Bridgeport, and surrounding areas.
- Customer Service: 800-722-5584
- Emergency/Outages: 800-722-5584
- Municipal Electric Utilities – These serve specific towns:
- Groton Utilities – Customer Service: 860-446-4000
- Bozrah Light & Power – Customer Service: 860-889-7388
- Jewett City Department of Public Utilities – Emergencies: 860-376-2955
- Wallingford Electric Division – Customer Service: 203-294-2020 | Emergencies: 203-265-5055
- Norwich Public Utilities – Customer Service: 860-887-2555 | Gas Emergencies: 860-887-7207
Natural Gas Utilities in Connecticut
- Connecticut Natural Gas (CNG) – Provides natural gas service in certain areas, including New London and parts of Hartford.
- Norwich Public Utilities – Provides both electricity and natural gas in Norwich.
- Gas Emergencies: 860-887-7207
Not every Connecticut town has natural gas service, as it depends on the presence of pipeline infrastructure.
Top 5 Customer Questions
1. How do I read my utility bill?
Utility bills usually have two parts:
- Delivery charges – set by the utility for maintaining poles, wires, or pipelines.
- Supply charges – what you pay for the actual electricity or gas, which can come from the utility or a competitive supplier.
2. Can I switch my supplier?
Yes. Customers can shop for electricity supply from licensed suppliers. The utility still delivers the power and maintains the infrastructure, but the supply price can vary based on the supplier chosen.
3. What do I do in an outage or gas leak?
- For electric outages, call your utility’s emergency line.
- For gas leaks, leave the premises immediately and call your utility’s gas emergency line.
4. Will switching suppliers interrupt my service?
No. The utility continues to handle delivery, so switching supply has no effect on reliability or service.
5. Are there penalties for switching suppliers?
Some supplier contracts may include early termination fees. Always review contract terms before enrolling.
Why Businesses Should Compare Supply Rates
Businesses use far more electricity and natural gas than residential customers, making supply costs a major part of their expenses. Comparing supplier offers is essential because:
- Higher usage means greater savings – even small rate differences add up.
- Rates change frequently – locking in favorable terms at the right time can save money.
- Fixed vs. variable contracts – comparing lets you choose the best option for stability or flexibility.
- Standard service isn’t always the cheapest – utilities update supply rates twice a year, but competitive suppliers may offer better deals.
- Competitive pressure lowers prices – when more businesses shop, suppliers compete harder for contracts.
Businesses that do not compare risk paying more than necessary. To easily evaluate options, visit Compare Connecticut Supply Rates


