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A café in Hackney and a distribution unit in Leeds can use identical amounts of electricity and be quoted differently, and neither supplier is doing anything unusual. London is the most expensive place in Britain to move electricity to, and that arrives on the bill whether anyone points it out or not.
London business electricity is distributed by UK Power Networks and London MPANs begin with 12. Wholesale energy costs the same across Great Britain. London differs on the network element: it sits in the highest zone for demand-side transmission charges, and available network capacity in parts of the capital is genuinely constrained.
In short
- London is UK Power Networks territory. Your MPAN starts 12.
- London sits at the expensive end of the transmission map because it consumes far more power than it generates.
- For many London businesses the binding constraint is available capacity, not the unit rate.
Which network distributes electricity in London?
Every business supply inside Greater London sits with UK Power Networks. The same company runs the South East and Eastern England regions, so it holds three of the fourteen distribution licences in Great Britain, but each is a separate region with its own charges. A Croydon site and a Chelmsford site are both UK Power Networks and are still priced differently.
Confirm it from your bill
The first two digits of your MPAN are the distributor ID. Find the supply number block on any electricity invoice.
You cannot switch distributor. It owns the cables and substations between the transmission network and your meter, and recovers that cost through DUoS charges your supplier collects on its behalf.
Why London sits in the highest transmission zone
Transmission charges are zonal, and the zones reflect a simple physical fact. Electricity is largely generated in the north and in offshore wind, and consumed most heavily in the south east. Somebody has to pay for moving it, and the charging system puts more of that cost on demand in areas that consume more than they produce.
London is the clearest example of that in the country. TNUoS demand charges here sit at the top of the range, and for a site on a half-hourly meter it is a visible line rather than a rounding error.
There is a compensation of sorts. London distribution costs are spread across an enormous number of connected customers, so the local DUoS element behaves better than the population density might suggest. The transmission side is where the premium lands.
The London problem nobody quotes for: capacity
This is the part worth your attention, and it is not on any comparison table.
Parts of the central London network are running close to their available capacity. For a business taking on a new unit, fitting out a kitchen, adding EV charge points or installing serious cooling, the question is not what the unit rate will be. It is whether the connection can carry the load at all, and what an upgrade costs and how long it takes.
Two things worth checking before you commit to premises. Your authorised supply capacity, which is what you are contracted to draw and are billed for whether you use it or not. And whether the site has headroom, because a capacity upgrade in central London is measured in months and can run to significant sums.
Businesses routinely carry more capacity than they need and pay for it monthly, or discover too late that they have less than they need. Both are expensive and both are avoidable with one phone call before signing a lease.
What this means for a London quote
The wholesale element of your quote is national. Two suppliers pricing your Shoreditch office are buying the same power as they would for one in Sheffield. VAT and the Climate Change Levy are UK-wide.
What is regional is the network element, and on a small commercial supply it is folded into the unit rate rather than itemised. That is precisely why the London premium is invisible unless you know to look. On a larger half-hourly supply it separates out, and you can see exactly what you are paying to have power delivered rather than generated.
London businesses with sites outside the capital
Plenty of London-headquartered businesses run sites elsewhere, and the first surprise is usually that the regional office is cheaper per unit than head office. That is the transmission gradient, not a supplier error, and no amount of negotiation will flatten it.
What is worth consolidating is the renewal calendar rather than the rate. Sites drifting onto out-of-contract rates one at a time costs considerably more than the regional difference ever will. Compare Manchester or Leeds to see the other end of the same map.
Getting quotes for a London site
Your region sets the network element. Everything else on the quote is still open, and that is where the work goes. The method is the same wherever you are, so rather than repeat it here, our business electricity guide covers how prices are built and what to check line by line.
One thing specific to comparing across regions. If you are pricing several sites at once, ask for the quotes broken out per meter rather than as a portfolio average. An average hides which site is carrying the cost, and it is usually the one nobody has looked at in three years. Multi-site management covers running that properly.
Common questions
Who is the electricity distributor for London?
London businesses are served by UK Power Networks, which also operates the South East and Eastern England distribution regions. London MPANs begin with 12. You cannot switch distributor; it is fixed by your location.
Is business electricity more expensive in London?
The energy itself costs the same as anywhere in Great Britain. London sits in the highest zone for demand-side transmission charges because the capital consumes far more electricity than it generates, so the network element of a London bill is typically higher than an equivalent northern site.
Why is electricity capacity a problem for London businesses?
Parts of the central London distribution network are close to their available capacity. Businesses adding significant load, such as EV charging, commercial catering or cooling, can find the connection is the constraint rather than the price. Capacity upgrades in central London can take months.
What is authorised supply capacity and does it matter in London?
Authorised supply capacity is the maximum power your site is contracted to draw, billed whether you use it or not. It matters everywhere, but in London it matters twice over, because carrying too little can block expansion and carrying too much is a monthly cost for nothing.
Does switching supplier change my network charges in London?
No. Distribution and transmission charges are set for your region and apply whichever supplier you use. Switching changes the wholesale cost, the supplier margin and the contract terms. The network element stays the same.
Will switching interrupt a London business supply?
No. Nothing physical changes when you switch business electricity supplier. The meter stays in place, the cables and the network operator stay the same, and the change is to the billing relationship only.
How do I find my MPAN and distribution region?
Your MPAN is printed in the supply number block on your electricity bill, usually shown as a grid of numbers. The first two digits are the distributor ID and identify your region. London supplies begin with 12.
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