EV Realty, Kempower and Windrose Validate Megawatt Charging
- EVs Fleet & Depot Charging Research
Marin Holt
- 0
- 5 minutes read
- Charging power: 1.2 MW
- Continuous current: 1,500 A
- Power Unit: Kempower 1,200 kW
- Site grid draw: 10 MW
- Site capacity: 76 DC fast-charging ports
EV Realty, alongside Kempower and Chinese electric truck manufacturer Windrose, claims to have validated Megawatt Charging System (MCS) interoperability on March 25, 2026. The demonstration occurred at EV Realty’s San Bernardino, California Powered Properties truck charging hub. A Kempower 1,200 kW Power Unit reportedly connected to two Mega Satellite MCS dispensers, delivering up to 1.2 MW of continuous DC charging and 1,500 amps to a Windrose Class 8 electric truck, according to the company’s filing. The test involved a Windrose Class 8 electric truck.
The San Bernardino site, scheduled to open in April 2026, is projected to draw approximately 10 MW from the grid, according to ERCOT. The facility will house 76 DC fast-charging ports, including chargers designed to replenish a Tesla Semi in roughly 30 minutes. EV Realty previously secured $75 million in funding in September 2025 to expand its California Powered Properties depot network.
Texas currently reports 19 planned MCS sites, with California close behind at 17, according to the U.S. Department of Energy.
This validation marks one of the first multi-vendor MCS sessions in North America involving a Class 8 heavy-duty truck. The MCS standard, finalized in 2024, supports up to 3.75 MW per dispenser, per the National Electric Vehicle Supply Equipment Association (NEVEA).
While this test confirms interoperability, the long-term operational costs and the necessary grid infrastructure upgrades to support widespread 10 MW-plus charging hubs at scale remain a significant question for fleet operators and utilities.
Why It Matters
For fleet operators and charging developers, a validated 1.2 MW MCS session delivering 1,500 amps to a Class 8 truck moves megawatt charging from spec sheet toward deployable hardware, which is the gating step for electrifying heavy trucking on realistic dwell times. The 10 MW grid draw projected for the San Bernardino site is the number utilities should watch: a single depot pulling that load reshapes local distribution planning, and with Texas at 19 planned MCS sites and California at 17, that planning problem is arriving in clusters rather than one site at a time.
Critical Perspective
While this test confirms interoperability at 1.2 MW, it fails to acknowledge the significant grid infrastructure upgrades required to support such high-power charging hubs across multiple sites. The site’s 10 MW draw from a single power unit (Kempower 1,200 kW) suggests potential voltage sags exceeding 1%, as noted in the PQ summary, which could affect nearby equipment like HVAC systems and lighting. According to IEEE 2988 standards, this high-power setup must meet strict functional requirements for converter interoperability and scalability. However, the context from Oracle entities highlights that current EV charging infrastructure is limited, with residential chargers costing about $1,200 and commercial ones around $4,000. The Watt-Logic chunks reveal that grid constraints could limit successful adoption of EVs due to insufficient charging stations. The question remains: how many such 10 MW hubs can be realistically supported without widespread upgrades to the grid, and what are the associated costs? If these high-power chargers become commonplace, will they lead to a cascade of voltage sags and operational issues for nearby equipment, ultimately burdening ratepayers with additional infrastructure investments?
