Lowest cost, predictable bills
Typical energy suppliers carry wholesale market markups you never see, which get added to your bill. Switch to RED™ and pay closer to the true cost of energy.
No middlemen = 30% cheaper
RED™ runs on our own pricing engine, removing the layers of middlemen and inefficiencies built into the wholesale market that get added to your bill (up to 30% of every bill).
Earn more through RED™ Plus
Most of what you pay isn't just power, but the non-power costs stacked alongside it. Through our RED™ Plus P442 benefit, we link your consumption to UK renewable generation to lower your non-power costs. This is in addition to the savings already unlocked by our pricing engine.
Energy with nothing to hide
Some charges are industry costs that every supplier has to pass on. These are not ours to control. Rather than leaving you guessing, we itemise these on your quote with 100% clarity as to what it is and where that money goes.
Lower bills with nothing to hide
95%
Customer renewal rate
4,600+
UK businesses already running on RED™
£40M+
Already saved by our customers
Priced outside the wholesale market
Traditional suppliers buy electricity through the wholesale market, adding layers of risk margins and unnecessary trading costs before passing the price to you.
RED™ saves you more on every bill.
Traditional energy bill
Wholesale markups
Supplier fees
Non-power costs
Energy costs
RED Bill
RED™ transaction fee
Non-power costs
Energy costs
Your RED™ tariff comes from our own pricing engine, which fulfils supply and demand across our portfolio of UK renewable generators and businesses.
How our tariff works
RED™ Day/Night Fixed
We fix your unit rates
Day and night rates, fixed for the duration of your contract. These include the cost of generating your electricity, a set of non-commodity costs we fix, and our fees.
We fix your standing charge
This covers the fixed costs of keeping your site connected - mainly your local distribution network.
We list every charge we pass through at cost
Passthrough costs are clearly listed on your quote from day one. If these costs move, the difference is always communicated in advance and passed through with no margin added.
Every charge, named and explained
Fixed charges
The charges that don’t change during your contract.
Day and night unit rates
The price you pay for the electricity you use
Your unit rate covers three things: the energy itself, our fee, and nine non-commodity costs every business pays by law.
Who sets this?
We do. Removing wholesale market mark-ups means your rate starts from a lower base than a traditional supplier's. Every cost inside it is worked out upfront and locked in, so nothing moves mid-contract.
Why it’s fixed
Predictability matters. We fix every cost we control.
What non commodity costs are included?
Nine non-commodity costs sit inside your unit rate for the whole contract: CfD, Capacity Market charges, FiT, RO, DUoS, BSUoS, RCRC, the Nuclear RAB Levy, and AAHEDC. Like VAT, these are obligatory charges set by third parties – NESO, DNOs, and Ofgem-administered schemes. We fix them into your rate for the length of your contract.
RED™ Plus benefit
Fixed reduction on your unit rate, pioneered by tem
An additional saving from reducing some non-commodity costs.
Who sets this?
P442 is an industry scheme that exempts businesses from some non-commodity costs by matching their consumption to UK renewable generation. tem pioneered its rollout and has returned more than £30m to businesses and generators since. This can create meaningful savings for your business.
Why it’s fixed
This saving is locked in for your contract and shown as its own line, so you can see it clearly.
Standing charge
The cost of keeping your site connected to the network.
A fixed monthly charge passed through at 0% markup.
Who sets this?
Your Distribution Network Operator (DNO) charges for maintaining the wires and substations that bring power to your site. Think of it like line rental on a phone: a fixed monthly fee for keeping the connection open, whether you use that much power or not. We pass this cost on at 0% markup, itemised on your quote, spread out over the life of your contract.
Worth knowing
Suppliers split costs between unit rates and standing charges differently, which makes quotes hard to compare. A lower standing charge often means the same cost has moved into the unit rate instead. It's worth checking you're comparing like-for-like.
Passthrough charges
Third party costs, passed on at 0% markup.
TNUoS: Residual Banded Charges
Fees for running and upgrading the UK's electricity transmission network
A monthly charge, forecast at quote and billed at 0% markup, set by an industry body every January.
Who sets this?
The National Energy System Operator (NESO), not us. Think of the transmission network as the UK's motorways: moving power at high voltage from generators across the country. And the distribution network as the B-roads: they carry it the rest of the way to your door. Your rate depends on your site's maximum demand. Every UK business pays it. We itemise it so you know exactly what you're paying and why.
Why it’s a passthrough cost
NESO confirms next year's rate every January. Nobody knows the number before then. Suppliers who fold this into a "fixed" price usually build in a safety buffer to cover that uncertainty. We show you our forecast on your quote, then charge exactly what NESO charges us. No buffer, no markup.
Does it change?
Yes, once a year. NESO confirms the new rate by 31 January; it takes effect on 1 April. If it changes, we tell you before your bill does.
Can you reduce it?
Potentially. If you're billed TNUoS as a passthrough charge, lowering your site's kVA can lower your cost. Drop it far enough, and you move into a lower TNUoS tariff band entirely. Check your maximum demand against your current band; if there's room to bring it down, it's worth exploring.
Capacity charges
The cost of reserving your share of the grid.
Picture your connection as a pipe. The kWh you use is the water flowing through it. Your kVA capacity is the width of the pipe – the most that could flow through at any one moment. This charge is for reserving that width, whether you use all of it or not.
Who sets this?
Your Distribution Network Operator, charged per kVA of agreed capacity, per month.
Why it’s a passthrough cost
The rate depends on your site's agreed capacity, not on anything we control. It only changes if your capacity agreement changes.
Can you reduce it?
Often, yes. Check your half-hourly data against your agreed band. If a lower band fits, you can apply to your DNO to reduce it. One caveat: getting capacity back later isn't guaranteed, so leave room for genuine peaks – going over your band brings a separate charge (Excess Capacity, below). We can share your usage data to help you decide.
Climate Change Levy (CCL)
A government tax on energy use
An obligatory tax set by HMRC. We pass it on at 0% markup.
Who sets this?
HMRC sets the rate in the annual Budget. It appears on every UK business energy bill, from every supplier, unless you qualify for a relief.
Why it’s a passthrough cost
It's a tax. We collect it at HMRC's rate and pass it straight through.
Can you reduce it?
If you're eligible. Businesses with a Climate Change Agreement get 92% relief on electricity CCL. Charities using energy for non-business purposes are exempt, as are very small users. Send us your exemption documentation and we'll apply the relief.
Meter charges (standard and site visits)
The cost of operating and monitoring your meter
Every half-hourly meter in the UK carries running costs for reading it, maintaining it, and collecting the data it produces. Think of it like a subscription fee for the device and the person checking in on it. We pass these on at 0% markup.
Who sets this?
Up to four parties keep your meter running: the Meter Operator (MOP), the Data Collector (DC), Data Aggregator (DA), and the Meter Asset Provider (MAP). A separate charge applies if an engineer needs to visit your site (e.g. to ensure the meter is working properly and the customer is billed accurately to their usage). The most common site visits are ‘handheld reads’ – manual data downloads, or to fix meter communication issues
Why it’s a passthrough cost
They invoice us; we pass on the same rate, listed on your quote.
Can you reduce it?
Potentially. These contracts don't have to run through us. We only appoint a default provider if you don't already have one. You're free to appoint your own MOP/DC/DA and agree rates with them directly. Our default is a highly efficient operator, but the choice is yours.
Reactive power
A fee for inefficient power draw
Some equipment, such as motors, compressors, and older lighting, draws power in a way that makes the local network work harder, a bit like an engine revving in neutral: energy spent, with less of it doing useful work. This charge covers that extra work.
Who sets this?
Your DNO measures it at your meter and charges accordingly. Many sites never see this charge at all.
Why it’s a passthrough cost
It's triggered by how your site uses electricity. We pass it through at the DNO's rate, only if and when it happens, at 0% markup.
Can you reduce it?
Usually. Power factor correction equipment is a one-off fix that often pays for itself. If reactive power charges show up on your bills, ask an electrical contractor to measure your power factor. Correcting it can remove the charge entirely.
Excess capacity
Applies only if you use more than your agreed capacity
Push more water through a pipe than it's built for, and you pay a premium for the overflow. It works the same way with your grid connection: go above your agreed kVA capacity, and the network charges more for the excess.
Who sets this?
Your Distribution Network Operator sets and measures it. It only appears if you exceed your agreed band.
Why it’s a passthrough cost
Like the capacity charge itself, this depends entirely on your site's demand and your agreement with the network. We pass it through at cost, only when it occurs.
Can you reduce it?
Yes. If it keeps appearing, your agreed capacity is set too low. Your capacity agreement sits with your Distribution Network Operator, so you can apply to them for a higher band. We can share your half-hourly usage data to support the application.
Extra savings on your
non-power costs with
RED™ Plus
P442 exists because tem made exempt supply accessible to all eligible UK businesses, saving you money on non-commodity costs. We apply it to every eligible* quote, as the RED™ Plus benefit.
Supplier fees
Non-power costs
Energy costs
Non-power costs
Energy costs
Non-power costs
Energy costs
Available on all RED™ Day/Night Fixed quotes*
A fixed p/kWh benefit, credited on every monthly invoice
No minimum usage required
*Available to all businesses except those classified as Energy Intensive Industry (EII).
Switch to
£40M+ of energy costs already saved for UK businesses
Up to 30% of your energy bills pays for wholesale market trading costs. RED™ removes them so you pay closer to the true cost of energy.