US retail energy supplier

IGS Energy US

Founded in 1989 and headquartered in Dublin, Ohio, IGS Energy is one of the largest privately held retail energy suppliers in the US, serving more than 1 million electricity and natural-gas customers across 10+ deregulated states. The company also offers home-warranty products, solar PPAs and rooftop-solar installation under the IGS Solar brand.

See IGS plans Call 1-877-444-7382

Founded 1989 1+ million Dublin, OH 11 states served

Founded

1989

Years in the US market

Customers

1+ million

Households served

Employees

~1,300

Workforce size

About

Who is IGS Energy?

Registered as Interstate Gas Supply, LLC (dba IGS Energy), IGS Energy uses this legal name for state public-utility-commission filings and customer contracts. The trading name on bills is the shorter, more recognisable form.

The company is headquartered in Dublin, OH, where it runs senior management, customer operations and regulatory liaison with state commissions.

IGS Energy was established in 1989. A longer track record means more years operating under state-commission rules and a wider history of customer feedback, billing and regulatory interactions.

IGS Energy operates independently — it is not part of a larger corporate group. This typically means faster decision-making but less wholesale-market scale.

Service area

Where IGS Energy operates

Electricity

6 states

Natural gas

10 states

Service availability varies by zip code within each state. Eligibility depends on your local utility's deregulation status — check on IGS Energy's website with your zip code before enrolling.

Plan structure

What plan types does IGS Energy offer?

Fixed-rate

Lock in a unit rate for 12, 24 or 36 months — the most popular IGS product, marketed as price-protection against utility default rate swings.

Variable / month-to-month

Wholesale-indexed rate, changes each billing cycle, no commitment. Useful as a bridge before locking a fixed plan.

100% Green Electricity

Standard fixed-rate structure matched with Green-e certified RECs. Small per-kWh premium.

IGS Home Protection

Warranty plans bundled with the energy contract: HVAC, plumbing, electrical, appliance and surge-protection coverage.

IGS Solar / CleanPath

Rooftop solar installation (PPA or purchase) and community-solar subscription products. Available in select states.

Renewable content: IGS's 100% Green Electricity plans are matched with Green-e certified RECs sourced from US wind and solar. The IGS Solar division also installs rooftop and community-solar assets directly.

See current IGS plans & rates

Timeline

IGS Energy — key moments

1989

Interstate Gas Supply founded in Dublin, Ohio by Bill White as a natural-gas marketer during Ohio's early gas-deregulation phase.
2001

Expands into retail electricity as Ohio deregulates the electric supply market.
2014

Launches IGS Solar, a separate division installing rooftop and community-solar projects across the Midwest and Northeast.
2019

Becomes the first US retail energy supplier to be certified as a B Corporation, formally embedding social and environmental performance into corporate governance.
2023

Crosses 1 million active customer accounts across electricity and natural gas.

Contact

Reach IGS Energy customer service

IGS Energy's customer service handles enrollment questions, billing, switching and complaints. Have your account number from a recent bill ready to speed up the call.

Have your IGS account number from a recent bill ready to speed up the call.
For service outages or downed wires, call your local utility — not IGS. The retail supplier never handles the physical grid.
Door-to-door enrollment is common in Ohio and Pennsylvania — always verify the agent's ID and read the contract before signing.
IGS Home Warranty claims are handled on a separate phone line printed on the warranty enrollment letter.

Customer service

1-877-444-7382

Mon-Fri 8 a.m. - 9 p.m., Sat 8 a.m. - 5 p.m. ET

IGS Energy online account

Frequently asked

IGS Energy — answers to common questions

IGS Energy is regulated by the public utility commission in each state where it operates. Reliability is best judged against your own usage profile: read recent reviews, confirm the customer-service hours match when you actually need to call, and compare the unit rate against the utility's price-to-compare for your zip code.

Plans can typically be enrolled directly on IGS Energy's website or by calling 1-877-444-7382. Before signing up, always compare the unit rate (¢/kWh for electricity, $/therm for gas) against your utility's price-to-compare for your zip code.

You can switch your retail supplier at any time, though early termination fees (typically $50-$200) may apply if you are on a fixed-rate plan and within the contract term. Check your enrollment letter or Terms of Service for the exact figure. Switching back to your default utility supply is always free.