Battery storage interconnection queue in Maryland

Before a new power plant or battery can connect to the US grid, it joins a queue for studies and an interconnection agreement. Most requests never get built. This shows every request: active, built and withdrawn.

Requests shown143,143 MW

Active in queue3,143 MW14 requests

Agreement signed500 MW1 requests

Withdrawn643,751 MW never built

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Project, developer, substation or county State Grid region Technology Status Year joined Sort

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Source: Lawrence Berkeley National Laboratory, Queued Up interconnection queue data (data through end of 2025). Map points are county centres, not exact sites.

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In studyAgreement signedUnder constructionBuiltSuspendedWithdrawn

Requests

14 requests

Project	Capacity	Status	Location	Region	Queued	Online
Battery storage project AI2-457, Charles County Battery storage	1,122 MW	In study	Charles, MD	PJM	Mar 2023	target 2027
Battery storage project AH1-725, Harford County Battery storage · Cardinal Energy Storage East, LLC	500 MW	In study	Harford, MD	PJM	Apr 2025
Fourth Quarter Battery storage · Fourth Quarter BESS, LLC	500 MW	Agreement signed	Montgomery, MD	PJM	Oct 2020	target 2030
Battery storage project AH2-265, Charles County Battery storage	200 MW	In study	Charles, MD	PJM	Mar 2022	target 2026
Battery storage project AH2-423, Calvert County Battery storage	180 MW	In study	Calvert, MD	PJM	Mar 2022	target 2025
Pulaski Energy Storage Battery storage · Pulaski Energy Storage LLC	135 MW	In study	Baltimore, MD	PJM	Feb 2025	target 2025
Battery storage project AH2-332, Prince George's County Battery storage	115 MW	In study	Prince George's, MD	PJM	Mar 2022	target 2025
Battery storage project AI1-189, Baltimore County Battery storage	110 MW	In study	Baltimore, MD	PJM	Sep 2022	target 2027
Battery storage project AI1-130, Baltimore County Battery storage	75.0 MW	In study	Baltimore, MD	PJM	Sep 2022	target 2026
Battery storage project AI1-131, Baltimore County Battery storage	75.0 MW	In study	Baltimore, MD	PJM	Sep 2022	target 2026
Battery storage project AI2-307, Cecil County Battery storage	60.5 MW	In study	Cecil, MD	PJM	Mar 2023	target 2026
Battery storage project AI2-311, Washington County Battery storage	30.0 MW	In study	Washington, MD	PJM	Mar 2023	target 2025
Battery storage project AG2-380, Queen Anne's County Battery storage · Concho Solar I, LLC	20.0 MW	In study	Queen Anne's, MD	PJM	Dec 2024	target 2023
Battery storage project AH2-049, Somerset County Battery storage	20.0 MW	In study	Somerset, MD	PJM	Dec 2021	target 2025

Capacity in the queue by state

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By grid region

ISO/RTO markets and the non-ISO West and Southeast.

PJM (Mid-Atlantic, Midwest)14 · 3,143 MW

Requests by year joined

Capacity of requests in this view, by the year they entered the queue. Click a year.

20202025

Source: Rand, J. et al., Queued Up, Lawrence Berkeley National Laboratory, data through end of 2025. Compiled from the queues of the 7 ISO/RTOs and dozens of non-ISO utilities. A request is a proposal to connect, not a commitment to build: historically most are withdrawn. Capacity is the requested interconnection size; hybrids include the storage component. Transmission lines · Planned power plants (EIA)