US retail energy supplier

Marathon Energy US

A Brooklyn-headquartered, family-owned retail-energy supplier, Marathon Energy serves New York and New Jersey households and businesses with natural gas, electricity and heating oil. The retail arm rebranded as Energo in 2023, with no change in ownership or customer accounts.

See Marathon Energy plans Call 1-718-435-2200

Brooklyn, NY 2 states served

About

Who is Marathon Energy?

Registered as Marathon Energy Corporation (operating as Energo from 2023), Marathon 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 Brooklyn, NY, where it runs senior management, customer operations and regulatory liaison with state commissions.

Marathon 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 Marathon Energy operates

Electricity

2 states

Natural gas

2 states

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

Plan structure

What plan types does Marathon Energy offer?

Fixed-rate electricity

Locks the unit rate (¢/kWh) for the contract term — typical retail-supply structure across NY and NJ markets.

Fixed-rate natural gas

Locks the per-therm gas commodity rate for the contract term across Con Edison, National Grid, PSE&G and other supported utilities.

Heating oil delivery

Beyond regulated ESCO supply, Marathon delivers heating oil and diesel to residential and commercial customers and offers boiler-service contracts.

Renewable energy

Marathon offers renewable-content supply options alongside conventional plans — confirm the REC matching percentage on enrollment.

Renewable content: Marathon Energy / Energo offers renewable-energy supply options alongside conventional plans; confirm the exact Renewable Energy Certificate (REC) matching percentage in the Terms of Service before enrolling.

See current Marathon Energy plans & rates

Timeline

Marathon Energy — key moments

2000

Marathon Energy founded as a family-owned heating-oil delivery business serving Brooklyn and the wider NYC metro area.
2010

Following New York and New Jersey retail-energy deregulation, Marathon expanded into licensed ESCO supply for electricity and natural gas across Con Edison, National Grid and PSE&G territories.
2020

Added Pennsylvania and Maryland to its electricity-supply footprint, and continued delivering heating oil, diesel, propane and value-added services alongside ESCO supply.
2023

Marathon Energy rebranded its retail-supply business as "Energo" in response to accelerated growth, with no change in ownership and no impact on customer accounts. The Marathon Energy brand continues to appear on legacy PSC filings.

Contact

Reach Marathon Energy customer service

Marathon 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 Con Edison, National Grid, PSE&G or other utility account number from a recent bill ready when calling 1-718-435-2200.
For gas leaks, downed wires or power outages, contact your local utility — Marathon / Energo supplies the commodity but the utility owns the wires and pipes.
Customers who previously enrolled under the Marathon Energy brand may now see "Energo" on bills and correspondence — this is a rebrand, not a transfer.

Customer service

1-718-435-2200

Mon-Fri business hours ET

Marathon Energy online account

Frequently asked

Marathon Energy — answers to common questions

Marathon 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 Marathon Energy's website or by calling 1-718-435-2200. 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.