The Cost of Power
Nowhere in the developed world does industrial electricity cost more than in the United Kingdom. UK industrial prices reached 26.63 pence per kWh including taxes and levies in 2024 — the highest of the 25 countries reporting to the International Energy Agency, and roughly 125% above the EU–14 median. For a factory, data centre, or commercial estate, the price of a kilowatt-hour is the single biggest reason to stop wasting any.
Unlike many countries, the UK barely gives heavy users a discount. Households pay roughly the same per unit as industry — so the usual argument that “industrial power is cheap, efficiency doesn’t move the needle” simply does not hold here. Every percentage point of wasted current is charged at one of the highest unit rates on earth.
| Who pays | Typical all-in price | Notes |
|---|---|---|
| Industry (IEA basis, incl. taxes & levies) | 26.63 p/kWh (2024) | Highest of 25 IEA countries; ~125% above the EU–14 median |
| Manufacturing (excl. Climate Change Levy) | 18.53 p/kWh (Q1 2025) | Even the “floor” is high by international standards |
| Business / SME (all-in) | ~25–26 p/kWh (Q4 2025) | Commercial estates feel the tariff as acutely as industry |
| Households (Ofgem price cap, incl. VAT) | ~26 p/kWh (Oct–Dec 2025) | Industry pays about the same as homes — little bulk discount |
Industrial and manufacturing prices are from the IEA and DESNZ Quarterly Energy Prices; the household figure is the Ofgem default-tariff (price cap) electricity unit rate. Figures are current as of 2024–2025 and are revised regularly — verify against DESNZ Quarterly Energy Prices and the Ofgem price cap at the time of reading. All prices are unit rates and exclude standing charges.
How You’re Billed
The headline pence-per-kWh is only part of the story. A half-hourly-metered UK site pays for the energy itself, for the networks that deliver it, for policy and decarbonisation levies — and, critically for power quality, for the capacity it reserves (in kVA) and for the reactive power it draws. Two of those line items move directly when you correct power factor.
| Component | What it is | Cut by power quality? |
|---|---|---|
| Energy (wholesale / commodity) | The kWh you consume, at the traded price | Indirectly — lower network losses |
| Network — DUoS | Distribution Use of System: delivering power over the local network | Partly |
| Policy & levies | e.g. the Climate Change Levy (0.775 p/kWh, 2025/26) and other decarbonisation costs | No |
| Availability / Agreed Supply Capacity (kVA) | A standing charge on the kVA capacity you reserve at your connection | Yes — lower kVA means a lower charge |
| DUoS Reactive Power charge (kVArh) | A charge levied on excess reactive energy drawn from the network | Yes — power factor correction cuts it directly |
So the answer to two questions UK operators often ask: yes, you are billed for kVA — through the Availability / Agreed Supply Capacity charge — and yes, you are billed for poor power factor, through the DUoS Reactive Power charge. Both fall as power factor rises toward unity, which is exactly what correction delivers.
Power Factor & Regulation
The UK does not impose one nationwide power-factor penalty in the way some Gulf utilities do. Instead the cost of low power factor is spread across the DUoS Reactive Power charge and the kVA Availability charge set by each Distribution Network Operator. The practical effect is the same: a site running at 0.85 power factor pays measurably more than the same site corrected to 0.98+, both in reactive charges and in the capacity it has to reserve.
On harmonics, UK connections must hold distortion within Engineering Recommendation G5/5 (which applies the EN 50160 voltage-quality limits), while embedded generation connects under G99. As variable-speed drives, rectifiers, EV charging and behind-the-meter solar multiply on UK sites, staying inside those limits increasingly requires active harmonic filtering — not just a one-off survey.
DUoS Reactive Power and Availability (kVA) charges are set per Distribution Network Operator and published in their charging statements; harmonic and voltage-quality limits follow ENA Engineering Recommendation G5/5 (on BS EN 50160) and G99 for generation. Confirm the charges and limits that apply to your connection with your DNO and supplier — they vary by region and are updated periodically.
Why Power Quality Matters Here
Three structural forces make power quality a UK boardroom issue, not just an engineering one. First, the tariff — already covered, and unmatched in the developed world. Second, the generation mix: renewables supplied a record 50.4% of UK generation in 2024, and that inverter-heavy supply raises harmonic distortion and reactive-power volatility at exactly the commercial and industrial sites we serve. Third, capacity: the transmission demand-connection queue ran from 41 GW to 125 GW in just six months of 2024–25, and a new connection can take five to ten years — so freeing transformer and switchgear headroom on the connection you already have is unusually valuable.
What matters less in the UK is resilience. The grid is highly reliable — around 40 customer-minutes lost per customer per year — so unlike sites in parts of Africa or the Gulf, UK operators are driven by cost, charges, and capacity rather than by keeping the lights on.
The Solution
HarmoniQ installs a coordinated, solid-state system at the low-voltage switchboard — where UK sites carry their cost, where the DUoS reactive and kVA charges bite, and where the inverter-heavy grid injects distortion. We deploy three products as the site requires: the HarmoniQ Booster for real-time power factor correction, the HarmoniQ Filter (HPF) for harmonic mitigation, and HarmoniQ Alpha as the integrated platform tying correction, filtering and voltage optimisation together. No switched-capacitor steps, no contactors, and no resonance risk with the harmonics already on your system.
Real-time true power factor correction to 0.98+ across the whole network — directly reducing the DUoS Reactive Power charge and the kVA Availability charge, and freeing transformer headroom so you can add load without waiting years for a new connection.
Active harmonic filtering that holds distortion within G5/5 limits — the component that matters most in the UK’s high-inverter environment, where drives, rectifiers, EV charging and on-site solar all push harmonic levels up.
Unifies correction, filtering and voltage optimisation across multiple boards or sites — with the visibility to prove power factor, reactive energy and kVA demand at the meter, continuously.
Why not just install capacitor banks? + Read more− Close
Switched-capacitor banks correct power factor in fixed steps at the incoming feed — enough, in theory, to lift you over a reactive threshold at the meter. But they respond in steps and seconds, so they lag fast-changing loads; they sit only at the boundary, so reactive current still flows through your internal network; and on a system carrying harmonics — as nearly every modern UK site does, with its drives, rectifiers and inverters — a capacitor bank can form a resonant circuit with the supply, amplifying those harmonics.
HarmoniQ is solid-state and dynamic: it corrects continuously rather than in steps, works across the network rather than at one point, and carries no resonance risk. Paired with active filtering, it is power factor correction and harmonic mitigation designed for a plant full of drives and inverters, not the switchgear of forty years ago.
What It’s Worth
| Lever | What changes | Effect on the bill |
|---|---|---|
| Power factor → 0.98+ | Reactive energy and kVA demand fall | DUoS reactive & kVA charges cut |
| Harmonic filtering to G5/5 | Lower distortion, cooler transformers & cables | Lower losses, longer asset life |
| Capacity release | ~15–20% of transformer / switchgear headroom freed | Defer or avoid a 5–10 year grid connection |
| Indicative annual saving | A six-figure sum on a site of this size — plus the capacity released | |
Every site’s loads, tariff and reactive profile are different, and the figures above are illustrative of the mechanism — not a quote. Our engineers will model the exact power factor improvement, reactive and kVA charges avoided, losses recovered and capacity released for your specific connection — get in touch for a site assessment, or see the method on our power factor correction and demand-charge pages.