Question 1

1. What's the difference between a flat tariff and a usage-based tariff for corporate EV fleet charging?

Accepted Answer

A flat (Charging-as-a-Service) tariff charges a set monthly fee per vehicle or port regardless of actual usage, giving the fleet budget certainty and putting utilization risk on the CPO. A usage-based tariff bills close to actual energy and demand cost plus a management fee — more accurate for the CPO but harder for the fleet to forecast. Most corporate contracts land on a tiered structure priced through billing software built for multi-tariff B2B contracts.

Question 2

2. How do demand charges affect corporate fleet charging contracts?

Accepted Answer

Demand charges bill the single highest 15-minute peak of power draw in a billing period, and commonly make up 30–50% of a commercial EV charging bill — sometimes far more at low-utilization sites. A fleet tariff that ignores a depot's specific peak-demand risk understates the CPO's real cost, which shows up as eroded margin rather than an upfront loss.

Question 3

3. What uptime SLA should a CPO offer a corporate fleet client?

Accepted Answer

Most bilateral CPO-fleet contracts set uptime between 98% and 99.9%, measured monthly and per charger — stricter than the U.S. federal NEVI program's 97% annual-average floor. The number matters less than the definition: what counts as "down," which outages are excluded, and whether the remedy is capped.

Question 4

4. How should volume discounts be structured in a fleet charging contract?

Accepted Answer

Tie discount tiers to realized monthly utilization (kWh or sessions actually delivered), not the number of vehicles named in the contract, and review the tier quarterly. This protects the CPO from a fleet that under-delivers on its projected volume while still rewarding genuine growth.

Question 5

5. Can fleet charging tariffs change mid-contract?

Accepted Answer

Only if the contract includes an escalation clause tied to a published benchmark — a DISCOM tariff order, a grid-tariff index, or a capped CPI-linked adjustment. Without one, a multi-year fleet contract locks the CPO into the energy-cost assumptions it signed with, a common source of margin erosion in longer deals.

Question 6

6. Should CPOs price fleet clients per kWh or per vehicle?

Accepted Answer

Neither is inherently correct — the choice should follow how predictable the fleet's charging pattern is. Fixed-schedule fleets (school buses, set logistics routes) suit a per-vehicle flat fee; fleets with variable or growing usage are safer priced per kWh with a demand-charge-aware structure, enforced through fleet charging management software rather than a manually-tracked spreadsheet.

ev charging sla

Corporate EV Fleet Charging Tariffs: Designing B2B Pricing For Reliability And Margin