TL;DR:
- Depot charging for commercial EV fleets requires upfront electrical infrastructure assessment — most depots need significant grid upgrades before charger installation, and lead times for DNO connections run 6 to 18 months for larger sites
- Smart charging software is non-negotiable at scale: unmanaged overnight charging for a 50-vehicle fleet will trigger demand charges that wipe out fuel savings
- UK fleet operators have access to multiple grant streams in 2026 — the LEVI Support Body fund, Innovate UK fleet electrification grants, and local authority schemes — but most require applications before infrastructure is ordered
Running a diesel or petrol fleet in the UK is becoming significantly more expensive as fuel duty rises and as Ultra Low Emission Zones expand beyond London. The economic case for electrification has crossed a threshold for most commercial fleet operators: total cost of ownership for electric vans and trucks is now lower than equivalent diesel over a typical replacement cycle, even accounting for charging infrastructure investment.
What catches operators off guard is the complexity of that charging infrastructure. Buying EVs is comparatively straightforward. Building the depot to charge them reliably, cost-effectively, and without surprising electricity bills is where most fleet electrification projects hit their real difficulties.
Start With the Grid Connection Assessment
Before selecting chargers, the first step is understanding what your depot’s electrical supply can actually support. This means getting a Distribution Network Operator (DNO) capacity assessment — your local DNO (UK Power Networks, Northern Powergrid, Electricity North West, Western Power Distribution, or Scottish and Southern Electricity Networks, depending on your region) can advise on your available import capacity and what reinforcement would be required for additional load.
For a 10-vehicle depot charging overnight with 7kW AC chargers, you’re looking at roughly 70kW of simultaneous load. For 50 vehicles, that’s 350kW unmanaged — and most commercial premises don’t have that on their existing supply without a connection upgrade.
DNO connection upgrades for larger depots can take 12 to 18 months and cost tens of thousands of pounds for new substations or cable runs. Planning your fleet electrification timeline without accounting for this lead time is the most common cause of delayed rollouts.
Getting the Assessment Right
Commission an energy consultant or your chosen charge point operator (CPO) to conduct a site energy assessment before approaching the DNO. This assessment should cover:
- Current maximum import capacity (kVA) and available headroom
- Peak demand profile from half-hourly metering data
- Distance from the nearest grid connection point capable of supporting additional load
- Whether an on-site substation is required
- Suitability of the site for battery storage to reduce peak import demand
Some charge point installers offer this assessment free as part of a sales process. Get at least two independent assessments — the quality varies significantly.
Charger Specification for Depot Use
For overnight depot charging, AC chargers in the 7kW to 22kW range are appropriate for most light commercial vehicles and vans. DC fast chargers (50kW+) are generally unnecessary for depot scenarios where vehicles are stationary for 8+ hours overnight, and they cost significantly more to install.
| Vehicle Type | Typical Battery (kWh) | Suitable Charger | Charge Time (7kW) | Charge Time (22kW) |
|---|---|---|---|---|
| Small van (e.g. Vauxhall Combo-e) | 50 kWh | 7kW or 22kW AC | ~7 hours | ~2.5 hours |
| Medium van (e.g. Ford E-Transit Custom) | 64 kWh | 7kW or 22kW AC | ~9 hours | ~3 hours |
| Large van (e.g. Mercedes eSprinter) | 113 kWh | 22kW AC or DC | ~16 hours | ~5.5 hours |
| Light truck (e.g. FUSO eCanter) | 83 kWh | 22kW AC | ~4 hours | — |
For shift-based operations where vehicles return mid-day, DC rapid chargers at 50kW to 150kW enable meaningful charge top-ups in 30 to 60 minutes. Assess shift patterns before specifying charger types.
OCPP and Open Standards
Insist on charge points that support Open Charge Point Protocol (OCPP) 1.6 or 2.0.1. OCPP is the open standard that allows chargers from any manufacturer to communicate with any compatible charge management software. Proprietary closed systems lock you into a single vendor’s software and pricing indefinitely.
Most reputable commercial charge point vendors — ABB, Alfen, Kempower, EO Charging, Schneider Electric — support OCPP as standard. Avoid any vendor that cannot confirm OCPP support in writing.
Smart Charging Software
At any scale above about five vehicles, smart charging software is essential. Without it, every vehicle plugged in simultaneously will attempt to draw maximum power at the same time — typically between 6pm and 8pm when drivers return — creating a demand spike that triggers capacity charges from your electricity supplier and may exceed your DNO import capacity.
Smart charging software solves this in two ways:
Load management schedules charging to stay within your site’s capacity limit, distributing charge across the overnight window. A 50-vehicle depot with a 150kW import capacity can still get every van to 100% overnight — the software just queues and throttles so the total draw never exceeds the limit.
Time-of-use optimisation shifts charging to low-cost overnight periods when electricity prices are lower. For fleet operators on half-hourly settled electricity contracts, wholesale price variation between peak and off-peak can be substantial. Smart software integrates with your energy tariff to schedule charging into the cheapest windows.
Established platforms for commercial fleet charging management include Monta, Fuuse, EO Hub, and Mina. Most offer OCPP-based integrations with a wide range of charger hardware, so you’re not locked into the charger vendor’s software.
Battery Storage as a Grid Alternative
For sites where a DNO connection upgrade is cost-prohibitive or where lead times are unacceptable, battery energy storage systems (BESS) can bridge the gap. A BESS charges slowly from the grid during off-peak periods (typically overnight) and discharges to power the charging fleet during peak demand windows — reducing the peak import capacity your site needs.
A 500kWh battery system paired with a 150kW import connection can, in principle, support the same charging throughput as a 300kW connection, at a fraction of the DNO upgrade cost depending on the reinforcement required.
BESS installations for fleet depots typically run £200,000 to £500,000 for systems in the 250kWh to 1MWh range. The economics depend heavily on electricity tariff structure, the cost of the DNO alternative, and whether you can participate in grid flexibility markets to generate revenue from the storage asset when vehicles aren’t charging.
Vehicle-to-Grid (V2G) Opportunities
V2G enables electric vehicles to export stored energy back to the grid or to the depot’s own loads during peak periods. For fleet operators with large battery assets sitting idle during day shifts or weekends, V2G participation in grid flexibility markets represents a genuine revenue stream.
Nissan e-NV200 and Leaf have supported V2G for some time via CHAdeMO. The more significant development is V2G support arriving in mainstream commercial van platforms — Volkswagen ID.Buzz Cargo and MAN eTGE both have V2G-capable variants entering the UK market in 2026, using the CCS standard that is now dominant in Europe.
Octopus Energy’s Powerloop tariff and EDF’s commercial V2G programme are the most accessible routes to V2G market participation for UK fleet operators at present. Anticipated revenues depend on market conditions but typically run £500 to £1,500 per vehicle per year based on current Balancing Mechanism and frequency response prices.
V2G adds complexity — bi-directional charger hardware costs more, battery degradation from discharge cycles needs to be modelled, and contractual arrangements with energy suppliers require legal review. For most operators, V2G is a consideration for phase two of electrification once the basics are running smoothly.
Grants and Funding in 2026
LEVI Support Body Fleet Fund
The Local Electric Vehicle Infrastructure (LEVI) Support Body, administered by Cenex on behalf of the Department for Transport, provides grant funding and technical support for fleet depot charging infrastructure. The fleet strand covers charge points and associated electrical infrastructure for fleets of 10 or more vehicles. Applications are assessed on fleet size, charge point deployment plans, and match funding commitment.
Innovate UK Industrial Fleet Electrification
Innovate UK has run several competition rounds targeting heavy and industrial fleet electrification, including off-road equipment, construction plant, and logistics vehicles. Grant support ranges from 25% to 50% of eligible project costs for SMEs. Check the Innovate UK Funding Finder for currently open competitions.
Local Authority and LEP Schemes
Many local authorities and Local Enterprise Partnerships operate their own fleet electrification support schemes, often funded through UK Shared Prosperity Fund allocations. Availability and eligibility vary by region — contact your local growth hub for current offerings.
Capital Allowances
Commercial vehicle charging infrastructure qualifies for the full first-year capital allowance (FYCA) under the Enhanced Capital Allowance scheme for energy-efficient equipment. This allows 100% of the cost to be deducted in the year of purchase rather than depreciated over time, improving cashflow for the infrastructure investment.
Building the Business Case
A fleet electrification business case should cover four cost categories:
Vehicle costs: Electric commercial vehicles carry a price premium of roughly 20% to 40% over equivalent diesel at current market prices, though this gap is narrowing as volumes increase. Factor in residual value — electric vans are currently depreciating faster than diesel due to market uncertainty, though this is expected to stabilise.
Charging infrastructure: For a 50-vehicle depot, budget £150,000 to £400,000 for chargers, installation, electrical works, and smart charging software, before grants. DNO connection upgrades are additional and can vary widely.
Energy costs: At current commercial electricity rates of approximately £0.18 to £0.25 per kWh overnight (depending on tariff), charging a medium van costs £10 to £16 per full charge versus £30 to £45 for an equivalent diesel tank. The fuel saving is typically the largest single line item in the business case.
Maintenance: Electric drivetrains have significantly fewer moving parts than diesel. Fleet operators typically report 30% to 50% reductions in routine maintenance costs for equivalent electric versus diesel vehicles.
A well-run 50-vehicle electric van fleet will typically achieve payback on infrastructure investment within 4 to 6 years through fuel and maintenance savings, before accounting for grant support.