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Multi-site energy

How multi-site businesses cut energy costs

By the Business Savings Guru team. Last updated 28 October 2026.

On this page
  1. The short answer
  2. Why do multi-site energy bills cost more than they should?
  3. What should be on a multi-site energy register?
  4. Should all our sites be on one contract?
  5. Which costs can a multi-site business actually reduce?
  6. Does half-hourly settlement change anything for multi-site businesses?
  7. What about water and waste?
  8. How Business Savings Guru helps
  9. Frequently asked questions
  10. Sources

The short answer

Multi-site businesses cut energy costs by treating every site as one portfolio: aligning contract end dates, tendering the combined volume to suppliers at the same time, and checking that each meter is on the right contract, tariff and capacity. The biggest avoidable costs are usually sites that have drifted onto out-of-contract rates, billing errors that nobody spots across dozens of invoices, and paying for network capacity a site no longer uses.

Why do multi-site energy bills cost more than they should?

Most multi-site estates grow one site at a time. Each new site arrives with its own supplier, its own contract end date and its own bill format. Over a few years the result is a patchwork: some sites on negotiated fixed rates, some on out-of-contract or deemed rates (which are typically much higher), and some contracts that renewed automatically because the notice letter went to a closed office.

None of this is visible on a single bill. It only shows up when you put every meter point on one list with its supplier, end date, unit rates, standing charges and annual consumption.

What should be on a multi-site energy register?

A usable register has one row per meter, not per site, because one building can have several electricity and gas meters. For each meter record:

  • The MPAN (electricity) or MPRN (gas) and the site address
  • Supplier, contract end date and the notice period in the contract
  • Unit rates, standing charge and, for larger electricity sites, the agreed supply capacity (kVA)
  • Whether the meter is half-hourly or non half-hourly
  • Annual consumption, ideally from actual reads or half-hourly data rather than estimates
  • Who pays the bill and which cost centre it belongs to

Once this exists, most of the savings opportunities become obvious.

Should all our sites be on one contract?

Usually it pays to align end dates so the whole portfolio can be tendered together. Suppliers price larger, combined volumes differently from single sites, and one tender means one set of terms, one renewal date and one bill format to check. The common way to get there is to put sites coming off contract early onto shorter "bridging" terms that end on a shared date.

There are exceptions. A site you plan to close or sell may be better on a short flexible term. A site with a very unusual load profile (for example, a cold store running overnight) may get better pricing quoted separately. The aim is control, not uniformity for its own sake.

Which costs can a multi-site business actually reduce?

Wholesale energy is only part of the bill. Network, balancing and policy costs, often called non-commodity costs, make up a large share of a business electricity unit price, and some of them depend on how each site is set up. Areas worth checking site by site:

  • Out-of-contract rates. Any meter on deemed or rollover rates is the first fix.
  • Agreed supply capacity. Larger half-hourly sites pay for the capacity (kVA) agreed with the network operator. If a site has downsized, that capacity charge may be higher than it needs to be. Reducing it is a request to the network operator, and you should check the site's future needs first because increasing it again later is not guaranteed and can cost money.
  • Reactive power charges. Some half-hourly sites pay for poor power factor. This shows on the bill and can sometimes be addressed with equipment on site.
  • Time of use. Half-hourly sites pay different network rates at different times of day. Moving flexible load away from the weekday evening peak can reduce costs.
  • Climate Change Levy. CCL is charged per kWh on business electricity and gas (0.801p per kWh for both from 1 April 2026). Some businesses qualify for reliefs or exemptions, for example through a Climate Change Agreement, and should check that these are applied on every meter.
  • VAT and charity or domestic-use reliefs. Check that any site eligible for the reduced rate is billed correctly.
  • Billing errors. Estimated reads, wrong meter details and duplicated charges are much harder to spot across many invoices. Regular bill validation catches them.

Does half-hourly settlement change anything for multi-site businesses?

Yes. Britain is moving almost all electricity meters to market-wide half-hourly settlement, with Elexon working to complete the migration by May 2027. As sites move, suppliers can price and bill them on actual half-hourly consumption rather than standard profiles. For a multi-site business this makes each site's load shape matter more in pricing, and makes good half-hourly data more valuable when you tender.

What about water and waste?

Water and waste follow the same logic. In England, businesses have been able to choose their water retailer since April 2017, and in Scotland since 2008. Many multi-site businesses still sit with the default retailer on every site. Waste contracts are often agreed locally site by site, with different collection frequencies and bin sizes, and are worth putting on the same register.

How Business Savings Guru helps

Business Savings Guru builds a single register of your electricity, gas, water and waste contracts, aligns end dates where it makes sense, and tenders the energy portfolio to suppliers on our panel: we have access to over 20 energy suppliers, including direct relationships with E.ON, ENGIE, SEFE Energy, SmartestEnergy, Valda Energy, EDF Energy, Corona Energy, Crown Gas & Power, Pozitive Energy and TotalEnergies. We aim to provide quotes within 48 hours of receiving the information and authority needed, depending on the complexity of your requirements. Every portfolio has a named account manager, and we tell you before each contract's notice window opens. We are a member of the Energy Ombudsman (membership number C35ENER126), and our commission is disclosed on the energy contract you sign.

Frequently asked questions

How many sites do you need before portfolio buying makes sense? There is no fixed number. It depends on total consumption more than site count. Two or three large sites can benefit, while twenty very small sites may see less difference in price but still benefit from aligned dates and fewer billing errors.

Can we move all our sites to one supplier at once? Only when each site's current contract allows it. Sites still under contract usually have to run to their end date or pay an exit fee, which is why bridging contracts are used to bring dates together.

What is the fastest saving for a multi-site business? Usually moving any meters on out-of-contract or deemed rates onto a proper contract, followed by correcting billing errors.

Do we need half-hourly data for every site? It helps for larger electricity sites. Half-hourly sites already have it, and the move to market-wide half-hourly settlement will make it available for more meters.

Does Business Savings Guru handle water and waste as well as energy? Yes. We review business electricity, gas, water and commercial waste contracts. Water retail choice depends on the nation: in England and Scotland you can choose your water retailer, and in Wales only sites using 50 megalitres a year or more can.

Sources