Maryland's Giant Microgrid Powers 400 Electric Buses

Montgomery County, Maryland just solved one of the biggest challenges facing electric vehicle adoption: keeping the lights on when the grid goes down.

Officials unveiled what's believed to be the nation's largest transit microgrid Thursday in Derwood. The system powers the county's growing fleet of 400 buses completely independent from the broader electrical grid when needed, using solar panels and massive battery storage.

"It's by far the most advanced clean energy project in the state and likely one of the most advanced in the country," said Eric Coffman, director of energy programs for the Maryland Energy Administration.

Here's what makes it special. The facility doesn't just charge electric buses. In the coming months, it will begin producing its own hydrogen fuel from water using an electrolyzer, powering hydrogen-electric buses that travel farther than standard electric models.

The county already has 70 electric buses running today. They'll receive their first two hydrogen-electric buses in about two months, with 11 more arriving by year's end. By 2035, the entire 400-bus fleet will run on zero emissions.

The best part? Taxpayers aren't footing the bill upfront. Massachusetts-based AlphaStruxure built the $48.6 million facility and will maintain it for 25 years under a public-private partnership. The county simply pays to use the energy at 13 cents per kilowatt hour, compared to the 19 cents they currently pay the utility company.

The Ripple Effect

The savings extend beyond electricity costs. Diesel buses cost Montgomery County about 85 cents per mile to operate. The new hydrogen-electric buses will cost just 31 cents per mile, a 64% reduction that frees up millions for other community needs.

Maryland officials hope other counties across the country will copy this model, using private capital to build similar microgrids without burdening taxpayers. The county's Silver Spring depot already operates a smaller version that launched in 2022.

Director David Dise acknowledged they're pushing ahead of available technology in many cases to meet the county's aggressive climate goals. But that pioneering spirit is exactly what's turning Maryland into a national leader in government fleet electrification.

One county's solution to clean transportation just became a blueprint for the entire nation.