The bill before the first kWh
Installing a fixed DC fast charger in New Zealand is rarely a single line item. Hardware alone runs from roughly NZ$40,000 to NZ$100,000 per unit, but the installed cost is where depots get caught: once civil works, switchgear and supply upgrades are counted, a single high-power DC port commonly lands between NZ$80,000 and NZ$250,000, and complex multi-port sites can push past NZ$350,000. Installation — not the charger itself — is usually the dominant cost, frequently 60–80% of the total.
The largest single driver is the grid connection. Rapid charging draws serious power, and most depots were never wired for it. Pulling 150–350kW across several bays typically means an upgraded supply, new switchboards and, at many sites, a dedicated transformer. Each of those triggers a lines-company application, trenching, inspection and sign-off long before a single vehicle plugs in. It is capital committed months ahead of any operational benefit, and it is spent whether or not your fleet size ever grows into it.
Time is the cost nobody prices in
Money is visible on a quote. Time is not, and it is usually the more expensive of the two. Transpower notes that even a small, simple new grid connection can take fewer than 18 months to energise, while large or complex connections can run beyond three years. Distribution-level transformer upgrades sit inside that window, and in constrained urban networks the queue only lengthens as demand climbs across every sector at once.
For a fleet that has already ordered electric vehicles, every month of waiting carries a running cost. Vehicles arrive before the infrastructure that powers them. Operators end up running dual fuel systems, leasing interim charging, or leaving new assets underused while the depot build crawls through consenting and connection. The depreciation clock starts the day the vehicle lands; the charging does not. A six-figure build that is eighteen months away does nothing for a delivery run that has to happen tomorrow.
Why the timing gap is widening
New Zealand's fleet is electrifying faster than the fixed network can follow. There are now well over 100,000 electric vehicles on the road, and in early 2026 weekly registrations passed 1,000 EVs — roughly double the pace of a year earlier. Public charging, meanwhile, sits at around 1,800 points. A 2026 government co-funding package — a NZ$68.5 million concessionary loan scheme backing more than 2,500 new chargers, including over 1,300 DC fast chargers — will lift the national total toward 4,550, with a stated goal of 10,000 points by 2030, or about one for every 40 EVs.
That rollout matters, but it is public, highway-oriented infrastructure. It does little for the commercial depot that needs its own vehicles charged overnight, behind the gate, on a fixed operational schedule. Depot electrification is a separate problem from the public network, and it is the one that stalls fleets. The national numbers can improve for years while an individual operator still waits on a transformer.
What mobile rapid charging actually replaces
Mobile rapid charging inverts the cost structure. Instead of a six-figure build tied to one site, the depot pays a predictable monthly service fee for modular charging systems that are delivered, monitored and maintained on-site. There is no transformer application, no trenching, and no multi-year connection queue. Units are battery-buffered and renewable-backed, so they deploy in days rather than years and can be scaled up, scaled back, or relocated as routes change.
Critically, what you are buying is availability rather than a box on a wall. The energy is contracted, the uptime is covered by a service-level agreement, and the maintenance sits with the provider. That shifts EV charging from a capital project your team has to build and run into an operating service that simply shows up — closer to how fleets already procure fuel than to how they procure buildings.
A worked comparison
Consider a depot bringing ten electric vans online. The fixed path might mean two to four DC ports, a supply upgrade and a transformer: call it NZ$300,000–$500,000 of CapEx and a realistic 12–24 month lead time before the first fully sanctioned charge. During that wait, the vans still need power, so interim arrangements add cost on top. The mobile path skips the CapEx and the wait: modular units arrive within days on a monthly fee, the vans charge on day one, and capacity flexes as more vehicles are added.
Over a long enough horizon at very high utilisation, the fixed build's low marginal cost per kWh eventually catches up and can win. The question is whether your demand is really that high, that stable and that permanent at that one address — and whether you can afford to strand new vehicles for a year or more while you find out.
When fixed infrastructure still wins
This is not an argument that fixed charging is obsolete. For the highest, most stable, single-site loads held over many years — a large distribution hub that will run the same volume from the same address for a decade — owned infrastructure amortises well and delivers the lowest long-run energy cost. Mobile charging is the better answer everywhere the demand is new, uncertain, temporary, remote, or spread across multiple depots that each need capacity now.
In practice the two are complementary. Many fleets use mobile rapid charging to electrify immediately and keep operating, then layer in fixed infrastructure later at the sites where long-run volume clearly justifies it — using the movable units as the safety valve when a depot outgrows its own supply or the grid runs out of road.
A simple test for your depot
Three questions usually decide it. First, how firm is your demand at this exact site over the next five to ten years? Rock-solid, high-volume demand favours a fixed build; anything uncertain favours flexibility. Second, what does a month of delay actually cost you in idle vehicles, interim charging and dual systems? Multiply that by a realistic connection timeline and set it against a monthly service fee. Third, will you need to move, expand or replicate this capacity across other sites? If yes, a unit you can relocate beats infrastructure you have to rebuild.
For most commercial fleets scaling across several sites on a tight timeline, leased modular charging is faster to deploy, easier to move, and — once the hidden cost of time is on the page — frequently the lower-cost path to keeping vehicles on the road.
Sources: EECA public EV charger data (2026); NZ Government / Beehive charger co-funding announcement, March 2026; Transpower grid-connection guidance (2025); indicative DC installation costs from New Zealand electrical trade estimates (2025–2026).