The UK's independent home energy expert
Compare energy options, calculate what you would save and make smarter decisions for your home. We show the working behind every number so you can act on it.
Built on public, authoritative data
Start with the maths, not a sales call
Every calculator models your home from a few questions, then shows the assumptions behind the result. Estimates, not quotes.
Solar Calculator
Location-specific yield from satellite irradiance, your roof and shading, then savings and payback.
Open calculator 🔋Battery Calculator
How much of your own solar you would keep, what a battery shifts off-peak, and whether it pays back.
Open calculator ♨️Heat Pump Calculator
Annual running cost against your current gas or electric heating, using your home and a real COP.
Open calculator 🔌EV Charger Calculator
Cost to charge at home on a standard versus an EV tariff, and what it saves against petrol.
Open calculator 🏠Home Energy Audit
A whole-home plan: which measures to do first, the order that pays, and the total cost and saving.
Open calculator 🌍Carbon Footprint
Your household emissions in tonnes of CO₂e, with the measures that cut the most for the least.
Open calculatorWhat changed this month, and what it means for you
The best smart tariffs right now
Time-of-use rates that reward shifting load to off-peak, and who they actually suit.
Heat pumpsAre heat pumps worth it in 2026?
The running-cost maths once the Boiler Upgrade Scheme grant (£7,500, or £9,000 for oil/LPG homes) is taken off the price.
SolarSolar panel payback, explained
Why payback ranges from 7 to 14 years, and the three inputs that move it most.
The Boiler Upgrade Scheme pays £7,500 or £9,000 toward a heat pump
Who qualifies, how the voucher reaches your installer, and the deadline you need to know.
Read the guide →Heat pump grant, England & Wales, depending on current heating fuel
Are home batteries worth it yet?
Where the numbers work, where they don't, and how an EV or a smart tariff changes the answer.
Read the analysis →Your tariff, your usage pattern, the battery price
Energy suppliers, scored on four things that matter
One score from customer service, complaints handled, price competitiveness and how the electricity is sourced. The full method is published.
| # | Supplier | Service | Complaints | Price | Green | TGC score |
|---|---|---|---|---|---|---|
| 1 | Octopus Energy | ★★★★★ | Low | Strong | High | 8.7 |
| 2 | OVO Energy | ★★★★★ | Medium | Average | High | 7.1 |
| 3 | E.ON Next | ★★★★★ | Medium | Average | Medium | 6.8 |
| 4 | EDF Energy | ★★★★★ | Medium | Average | Medium | 6.5 |
| 5 | British Gas | ★★★★★ | Higher | Average | Medium | 5.9 |
Illustrative ranking shown while the live data feed is connected. Final scores will combine Citizens Advice star ratings, Ofgem complaints data, current tariff prices and published fuel-mix figures. See the scoring method.
Government help you may be able to claim
Current UK schemes, what they pay and who qualifies. Figures link to the official GOV.UK source.
Boiler Upgrade Scheme
Heat pump grant in England and Wales: £7,500, or £9,000 for off-gas oil and LPG homes.
Zero-rated installs
No VAT on solar, batteries and heat pumps until 31 March 2027.
ECO4
Insulation and heating help for lower-income and vulnerable homes.
Smart Export Guarantee
Get paid for solar you export. Rates vary by supplier; up to ~20p/kWh.
The decisions people get stuck on
What the numbers look like for real homes
Modelled examples using the same engine as the calculators. They show the method, not named customers. Your result depends on your home and tariff.
“A 3-bed semi in Leeds, 4 kWp south-facing: about £520 a year saved, payback near year 11.”
“Detached 1990s home swapping a gas boiler for a heat pump: roughly level on running cost after the grant, lower carbon.”
“EV driver on an off-peak tariff: home charging works out near 2p per mile against about 14p on petrol.”
Figures are illustrative estimates from our calculators, rounded. They are not quotes and not based on named individuals. Run your own numbers.
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