Nation's Largest Transit Depot Microgrid Opens in Derwood
MCDOTApr 30, 2026
Montgomery County Executive Marc Elrich, Lt. Gov. Aruna Miller, and Council Vice President Marilyn Balcombe hosted a ribbon cutting on April 30, 2026 at the David F. Bone Equipment Maintenance & Transit Operation Center (EMTOC) in Derwood. The completed microgrid — described as the largest transit depot microgrid in the United States — integrates 4.8 megawatts of on-site solar generation, 2 megawatts of battery energy storage, and 2.375 megawatts of charging capacity. The system is designed to support approximately 200 battery-electric and hydrogen-electric buses and can operate in 'island mode,' independent of the utility grid, in support of the county's goal of a zero-emission bus fleet by 2035.
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Source: Media Advisory - Montgomery County, MD, “TODAY: Montgomery County Executive Marc Elrich, Lt. Gov. Aruna Miller, and Council Vice President Marilyn Balcombe to Host Ribbon Cutting Ceremony for Nation’s Largest Transit Depot Microgrid”, received Apr 30, 2026.
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