- Anne Arundel County7 business days
- Baltimore14 business days
- Baltimore County6 business days
- Bowie22 business days
- Calvert County15 business days
- Carroll County8 business days
- Cecil County6 business days
- Charles County5 business days
- Frederick7 business days
- Frederick Countysame day
- Gaithersburg8 business days
- Harford County7.5 business days
- Howard County3 business days
- Laurel32 business days
- Montgomery Countysame day
- Prince George's County14 business days
- Rockville10 business days
- Salisbury3 business days
- Somerset County10 business days
- St. Mary's County2 business days
- Washington County7 business days
- Wicomico County5 business days
- Worcester County30 business days
Maryland utility interconnection
| Utility | Approval before install | Apply via | Fee | Utility response | System size cap | Capacity map |
|---|---|---|---|---|---|---|
| Baltimore Gas & Electric Co (BGE) | Required | No fee | 5 days (required by rule) | 200% of annual usage | Hosting capacity map | |
| Choptank Electric Coop, Inc | Required | Portal | No online payment | 5 days (voluntary) | 200% of annual usage | Hosting capacity map |
| Delmarva Power | Required | Portal | Online payment | 5 days (voluntary) | — | Hosting capacity map |
| Potomac Electric Power Co (PEPCO) | Required | Portal | No fee | 5 days (voluntary) | 200% of annual usage | Hosting capacity map |
| Southern Maryland Elec Coop Inc (SMECO) | Required | Portal | Online payment | 5 days (required by rule) | 200% of annual usage | Not on record |
| The Potomac Edison Company (PE) | Required | No fee | 5 days (required by rule) | No size cap on record | Not on record |
Source: SolarTRACE, National Renewable Energy Laboratory (NREL), 2025-09-09 release. Times are medians for residential solar in the year shown. Requirements change — confirm current rules, fees and forms with the jurisdiction before you submit.