When ‘Just Swap the Meter’ Is Not an Option: Planning a Commercial Supply Upgrade

06 Jul 2026

Power demand on commercial sites is rising sharply. EV charging is being added to car parks. Heat pumps are replacing gas heating. Catering facilities are being upgraded and electrified. Cooling and ventilation loads are expanding. Each of these adds to the electrical demand the site has to support, and many older commercial sites were never built with that headroom in mind.

Most of those older sites run on a standard three-phase whole current supply. Whole current metering works well within its limits, but it has a hard ceiling on the capacity it can carry, expressed in kVA. Once a site’s demand approaches that ceiling, adding more load is no longer a question of fitting another circuit. It means moving to CT metering, which uses current transformers to measure larger loads, or securing formal grid reinforcement from the Distribution Network Operator, the DNO. Either route is a real project with real lead times.

The kVA ceiling is not always obvious until someone maps the programme and finds the DNO application lead time sitting in the middle of it, amber, external and outside anyone’s direct control.

The kVA ceiling, and why it is easy to miss

A whole current supply has a defined capacity. When the connected load grows toward that figure, the site is close to its limit whether or not anyone has checked. Because the lights still come on and the existing plant still runs, there is no obvious warning. The constraint only becomes visible when a new load is added and the supply cannot carry it.

Moving beyond the whole current ceiling is where the work begins. CT metering may be needed to measure the larger load accurately. The available supply capacity at the site has to be established. If the existing connection cannot deliver what the new demand requires, the DNO has to be approached for additional capacity or reinforcement. None of this happens by swapping a meter, and that is precisely the assumption that derails projects.

What a real upgrade involves

A supply upgrade is a lifecycle, not a single task. It runs from understanding what the site has today to energising the new capacity safely.

• A capacity review. Establish the existing supply, the current demand, and the headroom. Identify what the new loads will require in kVA and whether the existing infrastructure can be repurposed.
• A DNO application. Where reinforcement or additional capacity is needed, apply to the DNO. This carries lead times that sit outside the landlord’s control and have to be built into the programme from the start.
• Supplier and meter operator coordination. The supply and metering arrangements have to move in step with the physical work, including any change to CT metering, so the new connection is registered and billable when it goes live.
• The final step, where the new capacity is brought into service. It depends on every prior step being complete and aligned, which is why it is so often the point where poorly planned projects stall.

Fitted out, stocked up, doors unlocked and no power. The supply upgrade was not sorted in time, and every person walking past the window is a customer the business cannot serve.

The consequences of getting it wrong

When an upgrade is treated as a simple meter swap, the coordination between the DNO, supplier, meter operator and electrical contractor is ignored, and the project pays for it. The most damaging consequence is delay. DNO lead times and uncoordinated works can push a project back by months. For a landlord with a new tenant waiting, that is not an abstract problem. The tenant cannot open or trade without power, and the cost of that delay lands somewhere.

Poor planning also produces a string of smaller, expensive failures. Contractors arrive for visits that cannot proceed because a dependency is not ready, and those abortive visits are charged. Power shutdowns happen without proper coordination, disrupting occupiers who are already on site. Project costs spiral as the programme slips and parties wait on each other. Each of these is a symptom of the same root cause: the heavy coordination that an upgrade requires was never planned in.

One point of contact, one managed timeline

The way to de-risk a supply upgrade is to manage the whole lifecycle through a single point of contact. That means one party holding the capacity review, the DNO application, the supplier and meter operator coordination, and the final energisation, rather than the landlord trying to broker between parties who each see only their own piece.

Identifying available capacity early changes the economics of the whole project. If existing infrastructure can be repurposed, that may avoid a full reinforcement and shorten the programme considerably. If reinforcement is genuinely needed, knowing that at the start means the DNO lead time runs in parallel with everything else, rather than being discovered late and added on. The timeline is de-risked by sequencing, not by hope.

Everything is in. The cold room, the refrigeration runs, the distribution board. The one thing missing is the DNO connection, and the tablet on the worktop shows exactly where that application currently sits.

A worked example of the timeline

A landlord agrees terms with a new tenant for an industrial unit that requires additional electricity capacity to support refrigeration and process equipment. The fit-out programme begins as planned, with contractors appointed and occupation scheduled within three months. However, midway through the project it becomes apparent that the existing electricity supply is already operating close to its capacity limit. A review confirms that additional capacity is required, triggering a DNO application, metering upgrades and potentially network reinforcement works. While the fit-out is completed on schedule, the tenant cannot begin operations because the required electrical capacity is not yet available. The result is delayed occupation, lost revenue, additional project costs and frustration for both landlord and tenant.

Had the capacity review been undertaken at the outset of the letting process, the DNO application could have progressed alongside the fit-out programme. The technical solution would have been exactly the same, but early coordination would have prevented costly delays and ensured the unit was ready for occupation when the tenant was.

How Inteb helps

Inteb acts as the sole point of contact for the upgrade, managing the entire lifecycle from the initial capacity review through DNO applications, supplier and meter operator coordination, and final site energisation. We identify available capacity early, establish whether existing infrastructure can be repurposed, and sequence the programme so the site is energised when it needs to be, without the abortive visits and uncoordinated shutdowns that come from treating capacity as a meter swap.

Before you add the load, ask three questions

→ What is the site’s current capacity in kVA, and how close is existing demand to that ceiling?

→ Will the new load need CT metering, DNO reinforcement, or both, and what are the lead times?

→ Who is coordinating the DNO, supplier, meter operator and contractor, or are they each working in isolation?

New EV chargers, heat pumps and catering loads are worth installing. They just need a supply that can carry them, planned far enough ahead that the tenant can trade on day one.

FAQ

Is a commercial supply upgrade just a meter swap?

No. Moving beyond a whole current supply can require CT metering and DNO grid reinforcement, coordinated across the DNO, supplier, meter operator and electrical contractor. Treating it as a meter swap is the main cause of project delays.

What is the difference between whole current and CT metering?

Whole current metering measures the full load directly and suits smaller supplies, but it has a hard capacity ceiling in kVA. CT metering uses current transformers to measure larger loads, and is needed once demand grows beyond that ceiling.

Why do supply upgrades cause delays for new tenants?

DNO applications and reinforcement carry lead times outside the landlord’s control. If they are not planned in early, the work slips, and a new tenant cannot open or trade without the power being energised.