The three utilities that matter in the Lowcountry
Electric territory in South Carolina is assigned, not chosen — the SC Energy Office defines which utility serves which area, so your address decides your provider. Around Charleston that's almost always one of: Dominion Energy South Carolina (the investor-owned utility serving much of the metro area), Berkeley Electric Cooperative (the state's largest electric co-op, serving members in Berkeley, Charleston, and Dorchester counties — its Johns Island office covers the sea islands), or Santee Cooper (the state-owned utility, directly serving areas toward Moncks Corner and the coast north of the metro).
Territory lines don't follow city limits. Parts of Goose Creek, Summerville, and the islands are co-op territory while a neighbor a mile away pays Dominion — which is exactly why 'what rebate do I qualify for?' has no one-size answer in Charleston.
- Fastest check: look at the logo on your power bill
- Berkeley Electric = you're a member-owner, and co-op programs apply
- Dominion = the Dominion Energy SC efficiency and HVAC rebate programs apply
Why your utility decides your rebate
Utility rebates only apply to that utility's customers. Dominion Energy South Carolina publishes heating-and-cooling rebate offerings for its SC customers; Berkeley Electric offers member programs of its own; Santee Cooper runs its Empower home programs including heat-pump offerings. Installing a qualifying high-efficiency system with the wrong paperwork — or assuming a program from a utility that doesn't serve you — leaves real money unclaimed.
We verify your utility and the current program terms as part of every replacement quote, and our Rebates & Incentives Center tracks the active Lowcountry programs in one place.
Water is its own map
Water and sewer follow different lines again: Charleston Water System serves the peninsula and much of the surrounding area, Mount Pleasant Waterworks serves the Town of Mount Pleasant, and Summerville-area homes are largely on Summerville CPW. For plumbing work, the authority matters for service-line questions — including the lead-service-line inventories utilities are now required to publish.
