What happens to your fleet in a power cut — and how to plan for it
Once vehicles run on electricity, a power cut stops charging — and eventually the fleet. Here's how to think about the risk and the options.
Last updated 15 August 2026
When your vehicles ran on diesel, a depot power cut was an inconvenience. Once they run on electricity, it becomes an operational risk — worth planning for deliberately rather than discovering on the day.
What actually happens
In a power cut, charging simply stops — just as fuel pumps would if their power failed. If vehicles are already charged, a short overnight outage may pass unnoticed. But a longer or badly-timed interruption can leave vehicles short and, eventually, off the road. The severity depends entirely on how critical continuity is for your operation.
Grade your exposure honestly
The first step isn’t hardware — it’s an honest assessment. A commercial fleet might absorb a short outage with charged vehicles in the yard; an essential or blue-light service cannot afford to be caught out at all. How much resilience you need follows directly from how much downtime you can genuinely tolerate.
The options, in brief
Depending on that grade, the tools are: an on-site battery to keep essential charging going through shorter interruptions; backup generation or islanding for longer, critical situations; and smart prioritisation to make the most of whatever backup you have.
Plan in proportion
The golden rule is proportion — enough resilience to meet your real needs, not gold-plating for a low-stakes fleet nor skimping on an essential one. Resilience is far better designed in early than bolted on after an outage exposes the gap. A clear plan, sized to your exposure, is the goal.