Cost Per Mile to Charge a Class 8 Electric Semi Truck

Cost per mile equals kilowatt-hours per mile times your effective cost per kilowatt-hour, and effective cost is energy plus demand charges spread over what you actually consumed that month. That method does not change for a Class 8 truck. What changes is the first term.A delivery van consumes roughly 0.55 kWh per mile. A Class 8 tractor consumes something like three to four times that - see the next section for the sourced range. Multiply the same ten- or twenty-cent gap between a depot rate and a public DC fast-charging rate by a van's consumption and you get a few cents per mile. Multiply it by a truck's consumption and you get tens of cents per mile. The mechanism is identical to the one covered in our general fleet cost-per-mile article; it just produces a dollar figure at truck scale instead of a rounding error.

Figure on roughly 1.7 to 2.2 kWh per mile for a loaded Class 8 battery-electric tractor, and treat that as a starting range, not your number. A commonly cited planning figure used in truck-efficiency analysis is about 2.0 kWh per mile in flat terrain and nominal ambient conditions - NACFE's Run on Less - Electric program has documented battery packs from roughly 565 to 705+ kWh supporting 350 to 500+ miles of daily operation on that kind of consumption, with an 875-mile single-day maximum recorded on favorable terrain.Terrain, payload, ambient temperature and regenerative-braking recovery all move this number more than they move a van's, because the truck is heavier and the battery is larger. NACFE's own reporting flags that BEV energy consumption can be measured four different ways - daily charge, net charge, daily consumed, net consumed - and they do not agree with each other, which is one more reason to pull your own telematics rather than adopt a single published figure as fact.

Your effective depot rate is the energy rate on the bill plus the demand charge divided by kilowatt-hours consumed, exactly as our fleet cost-per-mile article works through with a worked example. What differs for a Class 8 yard is the account you're likely sitting on: a truck depot pulling multiple megawatts of connected load is a large-load or primary-voltage commercial account, not a standard small-commercial rate, and those tariffs commonly price energy closer to the industrial than the general-commercial rate class.US EIA data put the national average commercial electricity price at roughly 13.5 to 14.4 cents per kWh in early-to-mid 2026, against roughly 8.5 to 9 cents per kWh for the industrial class over the same period. That gap is directional and national - it says nothing about your utility's rate schedule - but it is the reason a truck depot's energy term can land meaningfully below a general commercial account's, before demand charges are even added. Ask your utility which rate schedule and which demand-charge structure the account is actually on; do not assume the number on last year's bill for a smaller account still applies.

Several commercial charging cost guides report depot charging for a Class 8 truck at roughly $0.15 to $0.30 per mile, and public DC fast charging at an effective $0.40 to $0.60 per kWh. Notice the guides quote depot in dollars per mile and public in dollars per kWh - that is how the sources presented it, and it means the two numbers are not directly comparable until you convert them.Convert the public figure using the consumption range above and it gets stark fast: $0.40 to $0.60 per kWh times 1.7 to 2.2 kWh per mile works out to roughly $0.68 to $1.32 per mile - well above the reported depot range. We are printing that arithmetic so you can see how it was built, not presenting it as a confirmed number. None of the guides we checked published the underlying metered sessions or invoices behind either figure, and we could not independently verify them.Use this range as a sanity check on the order of magnitude, not as an input in a signed business case. Before it goes in front of a finance committee, replace it with your own depot bill and an actual receipt from whichever public network your trucks used.

US EIA on-highway diesel averaged $5.454 per gallon nationally the week of August 17, 2026, up from $5.257 the week before - check the current figure before you use it, because this series moves weekly. At a commonly cited 6 to 8 miles per gallon for a loaded Class 8 tractor, that prices diesel fuel alone at roughly $0.68 to $0.91 per mile at that week's national average price - fuel cost only, before maintenance, DEF or anything else.Depot electricity at the low end of the reported range, or built from your own tariff using the formula above, is commonly well under that. The comparison flips, or at least narrows a lot, the more a truck's charging leans on public DC fast charging instead of the depot - which is exactly why the depot-vs-public split matters more for a truck's economics than for almost any other vehicle class you'll operate.

Minimize reliance on public DC fast charging. That is the whole lever, and at truck-level consumption it is worth far more per mile than it is for a car or van fleet, because of the multiplier covered above.A return-to-base yard that reliably gets trucks home for an overnight dwell window can do nearly all of its charging at the depot rate. A route that regularly needs a mid-day top-up away from the yard pays the public rate on those miles, and if the reported range above is even directionally right, those miles cost multiples of the depot miles. Route planning and dwell-window discipline are cheaper than any hardware fix for this problem.