Vehicle price is not the whole TCO story.

The short answer

Vehicle purchase or lease price is the easiest part of EV fleet TCO to calculate, because it’s a single number set at acquisition. Energy cost is the part that’s actually hard to pin down, because it’s spread across home charging reimbursement, public network sessions, and workplace electricity — each billed and tracked differently. A fleet that only compares vehicle prices is looking at one line of the TCO calculation and estimating the rest.

Why energy cost is the fragmented part of TCO

Fuel cost for a combustion fleet is relatively simple: one type of purchase, tracked through fuel cards, at a price that’s roughly the same regardless of where the vehicle fills up. EV energy cost doesn’t work that way:

• Home charging cost depends on the driver’s personal electricity tariff and how reimbursement is calculated — flat rate or actual cost.
• Public charging cost varies by network operator, connector type, and sometimes time of day, so a session’s price isn’t predictable from vehicle or distance alone.
• Workplace charging cost depends on the site’s electricity contract and how usage is allocated across vehicles sharing that connection.

None of these show up as a single line item the way a fuel card does. Without a system that consolidates them, “energy cost” in a TCO model tends to become an assumption rather than a measured figure.

Policy and reimbursement decisions change the real number

Two fleets running the same vehicles can have meaningfully different energy costs depending on decisions that have nothing to do with the vehicle itself:

• Whether home charging reimbursement is set up to reflect actual session cost, or runs on a flat rate that may over- or under-pay relative to what drivers actually spend.
• Whether drivers are encouraged or required to use specific public networks with known pricing, versus charging wherever is convenient.
• Whether workplace charging load is managed to avoid unnecessary demand charges from a site’s electricity supplier.

These are operating decisions, not vehicle specifications, and they belong in a TCO calculation the same way maintenance policy or insurance choices do for any fleet.

Load management affects cost, not just capacity

Workplace and, in some markets, home charging can be affected by demand-based electricity pricing, where cost depends not just on total energy used but on peak demand at a given time. Uncoordinated charging — every vehicle plugging in and drawing maximum power at once — can push demand costs higher than spreading the same charging sessions across available time. This is a cost lever that has nothing to do with vehicle choice, but it directly affects the energy line of TCO, especially as fleet size grows and more vehicles share the same site capacity.

Building a TCO model that includes energy properly

A more complete TCO view for an EV fleet needs, alongside vehicle price and maintenance:

1. Actual home charging reimbursement data, not an assumed flat rate, if home charging reimbursement is session-based.
2. Public charging spend by network, so cost variance is visible rather than averaged away.
3. Workplace charging load data, to understand whether capacity constraints are adding cost or risk as the fleet grows.
4. Reporting that consolidates all three, so the energy line of TCO is a measured number rather than an estimate.

Track energy cost over the vehicle’s life, not just at acquisition

TCO isn’t a one-time calculation. Electricity tariffs change, reimbursement policies get revised, and a workplace site’s vehicle count grows over the years a vehicle is in the fleet. A TCO model built once at acquisition and never revisited will drift from what the fleet is actually paying. Reviewing energy cost data periodically — ideally from the same consolidated system used for reimbursement and reporting — keeps the TCO figure connected to what’s actually happening rather than the assumptions made when the vehicle was ordered.

What this means in practice

The vehicle price comparison a fleet does before purchase or lease decisions is useful, but it answers a narrower question than “what will this fleet actually cost.” The energy side of that question depends on decisions made after the vehicles arrive — policy, reimbursement setup, and load management — and those decisions are where a fleet has the most ongoing control over TCO. Getting visibility into actual energy cost across home, public, and workplace charging is what turns that side of the equation from a guess into a number that can actually be managed.