Mortenson is the engineering, procurement, and construction (EPC) partner for the Montgomery County David F. Bone EMTOC (Equipment Maintenance & Transit Operation Center) fleet depot EV charging and microgrid project in Derwood, Maryland in strategic partnership with AlphaStruxure as the project’s developer. 

The EMTOC microgrid will include up to 2.25 MW of electric bus charging, 5.5 MWDC of rooftop and canopy solar generation, 2 MW battery energy storage, and existing backup generation, along with plans for an on-site 1 MW hydrogen electrolyzer.

The microgrid will not only power a mixed fleet of battery electric and fuel cell electric buses but also the EMTOC campus’ five existing buildings, ensuring uninterrupted service in the event of a loss of utility power. It is engineered to operate in island mode indefinitely, guaranteeing the County’s operations during extended power outages, thereby enhancing the project's reliability and the community's resilience. 

As the project's EPC partner, Mortenson plays a crucial role in coordinating with all stakeholders to ensure alignment and clarity throughout the design and construction process. Leveraging our extensive engineering and construction experience in electric vehicle charging infrastructure, utility interconnection, battery energy storage, solar, and power delivery solutions, Mortenson is committed to creating more than just a facility. We are building a thoughtfully planned, state-of-the-art project that will set new standards in the industry while delivering a seamless experience for our customer.

The EMTOC project is a pivotal stride toward Montgomery County’s ambitious goal of achieving 100% emissions reduction by 2035 by reducing emissions from public transportation while bolstering the community's resilience and infrastructure assets. By 2035, the facility is projected to house over 200 zero-emissions buses.

When completed, EMTOC will be the largest renewable energy-powered transit depot and transit microgrid in the United States.

Construction of the project began in Q2 2024, and operations are expected in Q4 2025.