Five procurement questions fleets must get right before buying a megawatt charger

Why procurement matters now

Megawatt charging is moving from lab demos and pilot sites into commercial product lines and real-world installs. Vendors are shipping systems that can manage sustained ~1 MW transfers, national bodies are publishing technical specs for MCS connectors and EVSE, and fleet pilots are already live at ports and depots. That progress is good — but it makes procurement more complex, not less. The stakes are high: up-front capex, grid upgrades, warranties, interoperability and long-term software support all determine whether a megawatt site actually saves time and money.

The five questions to put in every RFP and contract

1. Does the hardware follow the published MCS and EVSE specs — and how will you handle future revisions?

   Buyers should require explicit conformance to the emerging standards that define the physical coupler, inlet and EVSE behavior rather than vague claims. The IEC technical specification for the MCS coupler (IEC TS 63379) now documents connector, inlet and cable parameters up to 1,500 V DC and 3,000 A, while IEC work on EVSE for megawatt systems (IEC 61851‑23‑3) links coupler design to charger safety and control. At the system level, SAE's J3271 provides guidance on interfaces and use cases. Put these references in procurement documents and ask vendors to state compliance test suites and timelines for field upgrades.

   Action: require a documented mapping to IEC TS 63379, IEC 61851-23-3 and SAE J3271 in proposals.

2. How do you validate thermal, battery and power‑control strategies for my vehicle mix?

   One-megawatt operation imposes stringent thermal and control demands on vehicle on-board systems and charger cooling. Vendor claims should be backed by vehicle‑level testing that demonstrates safe sustained charging and active power/thermal control. Siemens' prototype testing that delivered a sustained ~1 MW charge is an example of the kind of validation fleets should ask to see. Academic test platforms have also illustrated why 1–2 MW pulse capability and careful RESS control matter to achieving rapid, safe refuels.

   Action: require test reports showing continuous-power scenarios for representative vehicles and a plan for software/firmware updates if vehicle thermal behavior changes.

3. What is the site energy architecture — can the charger share power, integrate storage, and limit grid draw?

   Megawatt sites will typically be built two ways: depot-centric sites that use on-site battery energy storage (BESS) and energy orchestration to limit grid draw, and corridor or public hubs that focus on throughput but face tougher permitting and grid constraints. New commercial MCS products are explicitly designed for distributed, multi-connector architectures and tight BESS integration that allow energy sharing across connectors and V2G/vehicle buffering. Federal and program funding also shows the model: DOE-supported projects and demonstrations emphasize on-site storage and solar canopies to keep grid import manageable.

Action: require an energy‑architecture plan in bids showing peak grid draw, BESS sizing (if used), and how the supplier controls simultaneous connector power sharing. If you want to limit demand charges, put BESS and tariff-management requirements in the contract.

Real-world signals you can quote in an RFP

Use concrete examples in your RFP language: cite early commercial installs and product lines that demonstrate feasibility and vendor maturity, ask for lab/field reports like the Siemens 1 MW test, and require references from real deployments (for example, early MCS installs in Europe). Also require a detailed plan for permitting and interconnection, since grid upgrades remain a major schedule risk.

Bottom line

Procurement for megawatt charging is not just about a plug and a label. It’s about standards compliance, validated thermal and power control, energy architecture that tames grid costs, proven interoperability and cybersecurity, and contract terms that protect you as the technology matures. Treat the five questions above as minimum requirements in RFPs and contracts to reduce delivery risk and protect total cost of ownership as megawatt charging scales up.

Actionable next step: add clauses requiring (1) standards mapping, (2) vehicle-level test reports, (3) BESS or grid‑draw mitigation plans, (4) interoperability test evidence, and (5) upgrade/warranty terms to your next RFP.