Combining smart electric-vehicle (EV) charging with microgrids – integrating rooftop solar, on-site battery storage and intelligent load control – offers a scalable strategy for buildings, campuses and mixed-use developments to manage rising electricity demand while decarbonizing. As EV adoption accelerates, unmanaged charging risks overloading building grid connections and triggering costly upgrades. Smart charging systems apply dynamic load management, adjusting charging rates in real-time based on building load, feeder constraints, renewable output and tariff signals. This helps avoid overloads, improve phase balancing and shift demand to lower-cost periods. 

Microgrids enhance these capabilities by supplying and storing local renewable energy and shaving peak demand through coordinated dispatch of PV, storage and flexible loads. During upstream grid disturbances, microgrids with islanding capability can maintain EV-charging operations for priority vehicles or services, improving operational resilience. Together, smart charging and microgrids increase self-consumption of on-site solar, reduce coincident peaks, protect transformer and feeder capacity and enable more predictable, cost-effective charging behavior as electrification expands. 

Main outcomes of the solution

• Affordability: Reduces operational costs by shifting EV charging into lower-tariff periods and decreasing peak-demand charges. Microgrids with on-site solar and storage further reduce electricity expenses and may defer grid-connection upgrades. 
• Reliability & Flexibility: Improves load stability by coordinating EV charging with building demand, renewable output and storage capacity. This supports consistent charging availability and reduces the likelihood of overloads on internal or upstream grid infrastructure. 
• Business value: Creates structured investment opportunities through measurable cost reductions, avoided infrastructure upgrades and the potential for standardization across building portfolios. Reliable EV-charging services support utilization and long-term asset performance. 

Key deployment and scaling factors

1. Smart charging systems capable of scheduling and modulating charging in response to building load and grid signals. 
2. On-site renewable generation and battery-energy storage sized to expected EV demand and facility load. 
3. Integrated controls that coordinate charging, storage dispatch and building energy management. 
4. Clear economic modelling of demand-charge mitigation, self-consumption benefits and potential export revenue. 
5. Regulatory frameworks that allow flexibility services, time-of-use optimization and microgrid interconnection. 

Case Study

Scale Microgrids (2025), USA

Scale Microgrids is constructing a renewable energy microgrid to support a zero-emission electric bus fleet at the Santa Clara Valley Transportation Authority (VTA)’s Cerone Bus Depot in San Jose, California. The project integrates on-site solar generation, battery energy storage and smart EV charging infrastructure to support fleet operations while managing local electricity demand.  

The system under construction includes approximately 500 kW of solar PV canopies, around 4 MWh of battery storage and up to 3 MW of fleet-charging capacity. Bus charging is planned primarily overnight, aligning energy use with lower electricity tariffs and available on-site generation to ensure vehicle availability for morning service.  

The microgrid is designed to enhance operational resilience by supporting charging and essential depot functions during periods of grid stress or outages, with the option to connect temporary backup generation if required. The facility will remain grid-connected, with Pacific Gas & Electric upgrading local utility infrastructure and adding 3 MW of capacity to support growing electricity demand. 

VTA has indicated that the infrastructure is expected to underpin the deployment of 35 battery-electric buses planned for 2026 and support its longer-term transition toward a 100% zero-emission bus fleet, in line with California state requirements.[1]

References:

1. Electrifying Public Transit: Scale Microgrids Building Renewable Energy Microgrid for Santa Clara Valley Transit Authority I Microgrid Knowledge (October 2025)