In the heavy-building-materials sector, the math on fleet electrification has never been simple. Hauling pallets of block, bags of cement, and steel beams over regional routes—often with gross vehicle weights pushing 44 tonnes—tests battery range, payload, and depot power infrastructure in ways that parcel-delivery vans never will.
But in early 2024, one UK-based builders merchant with 180 medium- and heavy-duty trucks proved that the equation can be solved. Over 18 months, the company transitioned 85% of its fleet to battery-electric power while maintaining 98% on-time delivery and cutting operating costs by 23% per mile. This is how they did it.
The Starting Point: A “Do-Nothing” Crisis
The merchant operated 12 depots across the North of England and Scotland. Its 180 trucks—mostly 18-tonne rigids and 44-tonne artics—ran an average of 180 miles per day, with peak routes touching 220 miles. Fleet fuel costs had risen 41% in two years, and three major city councils had announced clean-air zone charges that would add £12,000 per truck annually by 2025.
The head of fleet, Sarah Kenworth, put it bluntly: “We weren’t making a green statement. We were making a survival plan. Diesel was becoming a commercial liability, and our customers—housebuilders—were starting to ask for carbon data on every load.”
The internal barrier was not desire; it was physics. Existing electric trucks in 2023 offered 130–160 miles of real-world range with a full payload in winter. That was 20–30 miles short of their longest daily routes. Charging at depots also meant upgrading 11 kV grid connections—a process that typically took 18 months and £250,000 per site.
The Strategy: Three Non-Negotiable Rules
Rather than piloting two or three trucks and waiting for results, the team adopted a full-system approach from day one. They set three rules:
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No route gets a truck it cannot complete without en-route charging. They would not rely on public chargers for daily operations—only for contingency.
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Every depot must have at least 80% of its peak charging capacity installed before the first EV arrives. That meant moving grid upgrades to the critical path, not the nice-to-have path.
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Payload parity must be maintained. No truck would carry less than its diesel predecessor—so they selected models with lightweight battery packs (liquid-cooled LFP) and actively managed axle-load distribution.
They then mapped every route against real-world telematics from the previous 12 months, not against WLTP range figures. The data showed that 78% of their trucks never exceeded 140 miles per day. For the remaining 22%, they adopted two solutions: overnight mid-shift opportunity charging at customer yards (using portable 50 kW chargers that the merchant supplied and installed at no cost to the builders) and swapping three of the longest routes to a “relay” model, where trucks handed trailers to fresh EVs at a midway depot.
The Fleet Selection: Not a Single Manufacturer
Conventional wisdom says pick one OEM and standardise. This merchant did the opposite. They ordered:
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60 × 18-tonne rigids from a European OEM with a 210 kWh pack (claimed range 170 miles)
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50 × 44-tonne artics from a Chinese manufacturer with a 350 kWh pack and a 2-speed gearbox for hill climbs
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45 × 7.5-tonne urban delivery trucks from a US-based EV startup with 150-mile range and 360° camera systems for tight city sites
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25 × 26-tonne hook-loaders (for skips and aggregates) from a specialist converter that retrofitted a proprietary battery system onto a standard cab-chassis
This mixed strategy was deliberate. It allowed them to compare real-world degradation, thermal management, and service intervals across climates and duty cycles. It also prevented supplier lock-in—a risk they considered existential given the fast-moving technology curve.
By December 2025, they had taken delivery of 153 EVs. The remaining 27 diesel trucks were kept as a strategic reserve for peak winter weeks and for routes to remote sites where three-phase power was not available for charging.
The Infrastructure Play: Smarter Than Just More Megawatts
Grid capacity was the make-or-break factor. The merchant’s head office had only a 500 kVA connection—enough for lights and forklifts, not for 60 trucks charging overnight. Instead of waiting for a utility upgrade that would take 18 months, they deployed a hybrid system:
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2 MW of on-site battery storage (second-life EV batteries from a bus fleet) at the three largest depots, charged from the grid at off-peak rates (7 p/kWh) and discharged to trucks during the 6-hour overnight window.
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Solar PV on all depot roofs, providing 15–20% of daytime power for workshop tools and office loads, effectively freeing grid capacity for charging.
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Active load management software that staggered charge starts so no depot exceeded its agreed import limit. Trucks were prioritised by departure time—those leaving at 5:00 AM started charging at 10:00 PM; those leaving at 7:00 AM started at midnight.
This avoided all grid upgrades except for one depot, where they paid £45,000 for a 500 kVA increase—a fraction of the original estimate. Total infrastructure capital expenditure came to £2.1 million, which was 40% less than the original utility-quoted cost for full upgrades.
The Operational Shift: Drivers as Co-Designers
The biggest surprise was not the trucks—it was the drivers. Early range-anxiety was real. After the first 20 EVs were deployed, three drivers refused to take them out, citing “uncertainty about getting back.”
The merchant responded not with memos but with a Driver Advisory Panel. Every week, five EV drivers met with fleet engineers to review actual consumption data, regeneration settings, and HVAC usage. The panel identified that pre-heating the cab while plugged in saved 8–10 miles of range per cold morning—a finding that was immediately coded into the depot’s departure checklist.
They also introduced a gamified in-cab display showing “efficiency score” (miles per kWh) against the fleet average. Drivers who consistently scored in the top 10% received a £75 monthly bonus. Within three months, average fleet efficiency improved from 1.2 mi/kWh to 1.45 mi/kWh—a 21% gain with no hardware changes.
Critically, the merchant revised its duty schedules. Instead of fixed 10-hour shifts, they offered flexible start times so drivers could charge during the cheapest overnight windows and still meet customer delivery windows. This required negotiation with the union, but agreement was reached when the company committed to reinvesting fuel savings into driver pay (an average 6% raise).
The Numbers That Matter
After 12 months of full EV operation (excluding the 27 diesel reserves), the merchant published its internal performance review:
| Metric | Diesel Fleet (2023) | EV Fleet (2026) |
|---|---|---|
| Cost per mile (fuel/energy + maintenance) | £0.89 | £0.68 |
| Planned downtime (servicing) | 8.2% of fleet hours | 5.1% |
| Unplanned breakdowns per 10,000 miles | 1.3 | 0.7 |
| Payload capacity (average) | 100% baseline | 98.5% |
| Driver retention (annual) | 73% | 89% |
| CO₂ per mile (tank-to-wheel) | 1.02 kg | 0.04 kg (grid average) |
Total annual operating cost saving: £1.42 million against a fleet of 153 EVs. Payback on the incremental vehicle cost (EVs were 38% more expensive than diesel equivalents) plus infrastructure was calculated at 4.2 years. With the UK’s plug-in truck grant and enhanced capital allowances, that payback shortened to 3.1 years.
The Hard Lessons
Not everything went smoothly. Three learnings stood out:
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Tyre wear increased 18% due to the extra weight of batteries and higher regenerative braking torque. The solution was switching to a specific EV-optimised tyre compound and adjusting the regen mapping to reduce peak deceleration forces.
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Winter range dropped 26% on the coldest days (-5°C), not the 15% the OEMs had quoted. The merchant responded by fitting auxiliary diesel-fired cab heaters (using 0.5 litres per hour) on the 44-tonne artics—a small compromise that preserved 30 miles of battery range without meaningfully affecting overall carbon reduction.
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One depot’s load-management software crashed during a firmware update, leaving 14 trucks with partial charges on a Monday morning. The team instituted a manual “charge-verification” checklist and moved all critical updates to Thursday afternoons, giving a full day to recover before the weekend.
The Customer Reaction
The merchant’s biggest customer—a national housebuilder with 4,000 units per year—requested verified emissions data per delivery. The merchant provided a dashboard showing real-time CO₂ per pallet, per mile, and per depot. That customer subsequently extended their supply contract by three years and agreed to a 2% price premium for “zero-emission delivery zones” on six housing sites.
Smaller builders were initially sceptical about EVs arriving late or with reduced payload. After the first six months, the merchant published a live tracker on its customer portal showing truck status, estimated arrival, and battery state of charge. Late deliveries (over 30 minutes) actually dropped from 4.2% to 2.8%—partly because EVs had fewer mechanical failures and partly because route planning became more disciplined.
What They Would Do Differently
In a retrospective workshop, the fleet team identified three changes for any merchant following their path:
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Order depot chargers 6 months earlier. The lead time on 150 kW DC chargers was longer than the trucks themselves. They had 12 trucks sitting idle for 3 weeks waiting for pedestals.
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Train workshop technicians before the first EV arrived. They relied on OEM training, which was scheduled after delivery. In hindsight, they would send two technicians to an independent EV course 6 months prior.
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Over-spec battery capacity on the 26-tonne hook-loaders. Those trucks often idled with hydraulic pumps running, drawing 5–7 kW continuously. The retrofit batteries were undersized, requiring mid-day top-ups. They are now retrofitting a second battery module on those units.
The Verdict: Electrification as a Business Lever
When asked whether she would do it again, Sarah Kenworth replied: “Not only would I—I’d do it faster. We went in thinking this was a cost and compliance story. It turned out to be a competitive advantage story. Our drivers stay longer, our customers pay a premium for our carbon data, and our energy costs are now more predictable than diesel ever was.”
The merchant is now planning to electrify its remaining 27 diesel reserves by mid-2027, using solid-state battery prototypes that promise 280 miles of range. It is also exploring V2G (vehicle-to-grid) trials, selling stored energy back to the grid during peak evening hours—a revenue stream that could further shorten the payback to under 2.5 years.
For other builders merchants staring at 180 trucks and a spreadsheet full of doubts, the message from this case is clear: do the route maths honestly, invest in infrastructure before the trucks arrive, and treat drivers as partners, not passengers. The physics are challenging—but they are no longer a barrier. They are just a parameter to manage.
Key Takeaways for Fleet Managers
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Start with real-world route data, not OEM brochures. Over 80% of regional haulage can be electrified today with existing battery tech.
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Grid constraints can be solved with storage, solar, and smart scheduling—often cheaper than utility upgrades.
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Mixed OEM fleets reduce risk and give you leverage on pricing and service.
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Driver engagement is worth more than battery chemistry. Efficiency gains from behaviour alone can deliver 15–20% extra range.
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Customer transparency turns sustainability into revenue. Verified carbon data is a product differentiator, not a reporting burden.
