88 Ports, 5.9 Megawatts, and $11 Million: Tour Helix Water District’s Massive New Fleet Hub
I recently traveled out to El Cajon, California in San Diego County to check out the grand opening of a massive new charging facility at the Helix Water District site. It features a staggering 88 DC fast charging ports and a massive power pipeline, but there is one twist: unless you drive an official municipal vehicle, you cannot pull up and plug in your personal EV here.
While this depot is restricted to commercial and government fleets, what Helix built offers a fascinating blueprint for how public agencies and private fleets can scale up electrification without crippling local power grids or blowing up operating budgets.
News Summary: The Details Behind the El Cajon Depot
The Helix Water District officially launched its flagship fleet charging hub, creating a regional charging infrastructure capable of supporting heavy municipal operations now and well into the future.
- Total Investment: $11 million project cost, with $10 million covered directly by grant funding.
- Total Power Supply: 5.9 megawatts of total site capacity provided by San Diego Gas & Electric (SDG&E), split across two separate 3 MW circuits for redundancy during grid maintenance, alongside a dedicated generator hookup for emergency resilience.
- Port Count & Hardware Mix:
- Autel 640 kW Power Cabinets: Supporting high-power 320 kW dispensers (capable of dynamic power sharing down to 160 kW per port when four stalls are simultaneously active). Equipped with RFID readers, Nayax credit card readers, barcode scanning, and auto-charge software.
- Autel 40 kW Dual-Dispenser Chargers: Power-split units delivering 20 kW per port, designed specifically for long overnight dwells for light-duty fleet trucks like Ford F-150 Lightnings.
- Heliox 180 kW Overhead Chargers: Mounted on overhead gantries inside service bays with custom retractable cable management systems, allowing multi-bay charging overhead for medium and heavy-duty service trucks.
- Legacy Level 2 Infrastructure: Retained legacy 6 kW ChargePoint chargers for smaller hybrid fleet vehicles like Toyota Priuses.
Helix Water District Facility Specifications
| Feature | Facility Specification |
|---|---|
| Location | El Cajon, San Diego County, CA |
| Total Total Capacity | 5.9 Megawatts (Split 3 MW / 3 MW Grid Supply) |
| Total Charging Ports | 88 DC Fast Charging Dispensers |
| Total Project Cost | $11 Million ($10 Million Grant-Funded) |
| Primary Hardware Partners | Autel, Heliox, ChargePoint |
| Max Port Output | 320 kW (Autel Ultra-Fast Dispensers) |
| Overhead Charging | 180 kW Heliox Gantry Mounted Retractable Systems |
Industry Context: What Fleet Infrastructure Means for Everyday EV Drivers
It might seem counterintuitive for everyday drivers to get excited about an 88-port site they cannot plug into, but large-scale depot installations directly benefit the broader EV ecosystem. When municipal fleets build out dedicated multi-megawatt facilities, they keep work trucks, service vans, and municipal pickups off consumer networks like Electrify America, EVgo, or Tesla Superchargers during peak hours.
Furthermore, Helix’s approach resolves the classic "chicken or egg" dilemma facing commercial fleets. Rather than buying dozens of electric trucks and waiting years for grid interconnections, Helix secured grant funding and grid access upfront. Utility connections of this magnitude can take years to negotiate; by securing nearly 6 MW of capacity today, Helix future-proofed its operations while neighboring municipalities can leverage the depot as a localized Charge Point Operator (CPO).
The Electric Duo Take: Practical Engineering and Smart Money
Walking through the El Cajon site, the sheer scope of the electrical engineering is striking. Looking at the conduit layouts and the massive SDG&E utility cabinets—which are easily some of the largest hardware setups I have seen in the field—shows how much thought went into future-proofing this yard. Running dual 3 MW circuits ensures that if one side of the facility goes down for utility maintenance, the agency can keep its daily operations moving without interruption.
During my tour, I caught up with Daria from Autel to discuss how hardware matching makes or breaks a project like this. What stands out is how Helix tailored charger speeds to vehicle dwell times rather than just throwing maximum power at every single stall:
- Right-Sizing Power: Installing massive 320 kW fast chargers for every stall would have been cost-prohibitive and unnecessary. The 40 kW Autel dual-dispenser setup (splitting to 20 kW per port) is the ideal match for an F-150 Lightning sitting parked overnight. It easily fills the battery by morning without taxing the grid or overspending on hardware.
- Overhead Engineering: The indoor Heliox setup is remarkably clean. By mounting 180 kW chargers overhead with retractable reels, Helix cleared floor space for service bays while allowing trucks to plug in overhead, even utilizing dual ports to charge both vehicle propulsion batteries and secondary equipment power packs simultaneously.
- Software Consolidation: Managing mixed hardware across vendors like Autel and Heliox can turn into a nightmare. Helix brought all these assets into a unified central software dashboard, enabling remote reboots, real-time power distribution management, and automated inter-agency billing.
The financial calculations for Helix are already paying off. Fleet managers on site shared that their electric Lightnings are showing drastic fuel savings compared to their gas predecessors, alongside immediate drops in routine maintenance costs. Combined with $10 million in grant funding, Helix is set to hit its break-even point quickly, delivering long-term savings to local water customers and taxpayers.
We are going to see a lot more of this infrastructure scaled up across North America soon. We will be covering commercial electrification firsthand at the upcoming ACT Expo (Advanced Clean Transportation Expo) in Las Vegas this May, so stay tuned for more fleet updates!
Whether you drive a heavy-duty commercial vehicle or a personal electric crossover, enjoy the ride!
