How smart homeowners are cutting electricity bills by up to 90%
The big energy shift
Your electricity bill is going in one direction. Up.
You've probably already noticed it. The quarterly bill that used to feel manageable now makes you wince. And here's the uncomfortable truth: it isn't going to stop.
Three forces are reshaping how UK homes use electricity, and all three point the same way:
- Electricity prices are rising. UK wholesale energy costs have proved volatile, and the era of cheap, stable electricity appears to be over. Even in calmer periods, household bills have roughly doubled over the past decade.
- Electric vehicles are arriving. More than 1.1 million EVs are now registered in the UK. Charging one at home adds roughly 2,000–4,000 kWh to your annual electricity demand. That's a significant increase on a typical household's current usage.
- Heat pumps are replacing gas boilers. As the UK phases out gas heating, heat pumps, which run on electricity, will become the standard. An air-source heat pump typically uses 3,000–5,000 kWh per year.
Put these together, and the picture is clear: over the next decade, many homes will double their electricity demand.
For households that do nothing, that means dramatically higher bills. For households with solar, it means something very different: an opportunity. Because every kilowatt of electricity you generate yourself is one you don't have to buy.
Solar gives homeowners control over this change.
The biggest myth about solar
The panels are the most important part.
Walk down any street with solar panels, and you'll hear the same conversation: "We got x panels and a Y kilowatt system." People talk about panels as they talk about engine size. Bigger must be better. But the households saving the most money aren't the ones with the most panels. They're the ones who've understood something most people miss entirely.
Solar isn't about generation. It's about energy flow.
Generating electricity from sunlight is just step one. The real question, the one that determines how much money you actually save, is what happens to that energy next. Does it get used in your home the moment it's generated? Does it get stored in a battery for later? Does it get exported to the grid at a relatively low rate? Or does it go to waste entirely because your home is empty during the day?
Three concepts determine your solar outcome:
- Self-consumption using the solar power you generate in your own home, rather than sending it to the grid. This is the single most valuable thing your system can do.
- Storage captures surplus solar energy in a battery so you can use it in the evening, overnight, or on cloudy days, instead of buying from the grid at peak prices.
- Timing scheduling energy-hungry devices (washing machines, dishwashers, EV charging) to run when your panels are producing, so you consume your own free electricity rather than expensive grid power.
When you understand these three things, you stop thinking of solar as a product and start thinking of it as a strategy.
Solar money flow
Where the real solar savings come from
Your solar panels generate electricity. But not all of that electricity is worth the same to you. Here's why.
- Use power in your home - Save approximately 28p per kWh
When your solar panels generate electricity that your home uses in real time, powering your lights, appliances, fridge, and TV, you avoid buying that electricity from the grid. At current rates, that's worth around 28p per kWh. Over a year, a typical solar home uses 50–70% of what it generates directly. - Store energy in a battery - Avoid peak pricing
Surplus solar power that isn't used immediately can be stored in a home battery and used later, typically in the evening when the sun isn't shining, but your household is at its busiest. Without a battery, that surplus would be exported. With one, it replaces expensive grid electricity. Batteries also let you take advantage of cheap overnight tariffs, charging on low-cost electricity and using it during the day. - Export to the grid - Earn approximately 15p per kWh via the Smart Export Guarantee (SEG)
Any electricity you generate but don't use or store can be sold back to the grid under the government's smart export guarantee. Export rates vary by supplier but typically sit around 15p per kWh. It's a useful bonus, but notice that self-consumption is worth almost twice as much.
The goal is to maximise self-consumption. The more of your own solar power you use at home, the less you buy from the grid and the faster your system pays for itself.
5 strategies you can use
Strategy 1: the price gap
Why using your own solar power is worth nearly twice as much as selling it
This is the foundation of every great solar strategy, and it's simpler than it sounds. Right now, if you buy electricity from the grid, you pay approximately 28p per kWh. If you sell electricity back to the grid via the smart export guarantee, you receive approximately 15p per kWh. That's a gap of around 13p on every unit. Every time your solar system powers something in your home, a washing machine, a kettle, a charge for your phone, you're saving 28p rather than earning 15p. The difference adds up to thousands of pounds over the life of the system.
What this means in practice: run your energy-hungry appliances during the day when your panels are generating. Set your washing machine, dishwasher, and tumble dryer to run on timers from mid-morning to early afternoon. If you work from home, you're already in a strong position; you'll naturally consume more power during peak generation hours.
For a typical Cotswolds home with a south-facing roof and a 4kwh system, this strategy alone can yield annual savings of £400–£700.
Strategy 2: battery arbitrage
Buying cheap electricity at night and using it at peak prices
The UK energy market offers something that most homeowners don't yet take advantage of: time-of-use tariffs. These tariffs charge different rates depending on when you use electricity. Off-peak periods, typically overnight between 11pm and 6am, can be as low as 7–9p per kWh. Peak daytime rates can reach 28p or more. A home battery changes everything. With a battery installed, you can programme it to charge overnight at the cheap rate, then discharge during the day and evening at the expensive rate. The difference of approximately 19–21p per unit represents pure savings on every kWh cycled through the battery.
A typical 10kWh battery cycled daily generates roughly £500–£700 in arbitrage savings alone, even without solar panels. Add solar into the mix, and you have a system that's capturing cheap electricity overnight, free electricity during the day, and using both at exactly the right moment.
At fit solar, we install and configure leading battery systems, including Fox, Ess and Givenergy, and set them up to work intelligently with your tariff from day one.
Strategy 3: the EV multiplication effect
Electric vehicles dramatically increase solar value
An electric vehicle is a significant energy consumer. Charging a typical family EV from empty adds around 50–80 kWh to your bill, roughly equivalent to running your home for two or three days. Do that weekly, and your annual electricity bill rises by £700–£1,000 or more at grid prices. But charged on free solar power? That cost drops to near zero. An EV owner with solar can charge their car predominantly from panels, especially if they use a smart charger that prioritises solar surplus. The savings stack quickly. Several of our customers in the Stroud area have halved their total energy bills after combining solar, battery storage, and an EV charger.
We supply and install the UK's leading EV charging points, including solar-integrated and tariff-aware models that automatically charge when rates or solar output are optimal.
Strategy 4: thermal storage
Your hot water tank is an invisible battery.
Most homes heat water with gas or an electric immersion heater. If you have an immersion heater, and many homes do, even if it's rarely used, it can become one of the cheapest "batteries" available. A solar diverter device monitors your home's electricity flow and, instead of sending surplus solar to the grid at 15p, redirects it to heat your hot water for free. A full tank of hot water stores several kilowatt-hours of energy as heat, effectively acting as a battery with no degradation, no warranty concerns, and no upfront cost beyond the diverter device.
For homes with heat pumps, the principle scales up considerably; thermal storage can absorb surplus generation for hours.
Strategy 5: incentives & tariffs
The financial landscape is more favourable than most people realise
0% vat on solar and battery storage. As of February 2024, solar panels, battery storage systems, and associated equipment are subject to 0% vat, resulting in a 20% saving on installation costs compared to the previous position.
The Smart Export Guarantee (SEG). All licensed electricity suppliers with over 150,000 customers are legally required to offer an export tariff. Rates vary, so it's worth shopping around. Some suppliers offer rates significantly above average, particularly for battery-enabled homes that can export at strategic times.
Financing options. Some lenders, including green mortgage providers, offer favourable rates for energy efficiency improvements. Several of our customers have used bank green improvement loans to fund installations. Being MCS-certified, as Fit Solar is, is often a requirement for accessing these schemes.
The solar payback timeline
Is solar worth it? Here's the honest numbers.
The question every homeowner asks deserves a straight answer.
Year 0 installation
Typical system cost: £5,000 – £12,000
A 4–6-panel system with no battery typically starts at around £5,000. A full system with battery storage, smart charger, and solar diverter sits in the £9,000–£12,000 range. Financing is available, and 0% vat now applies to all installations.
Years 1–7 savings accumulate
Typical annual savings: £900 – £1,600
Savings depend on your roof orientation, household energy usage, whether you have an EV or heat pump, and how actively you manage consumption. Homes with EVs or high electricity use consistently see savings at the top of this range. Most customers tell us their bills dropped noticeably from the very first month.
Years 8–25+ free electricity
The system quietly keeps working.
Once the system has paid for itself, typically within 7–10 years, every unit generated is pure savings. Most high-quality solar panels come with a 25-year performance guarantee and continue to perform well beyond that. Many panels from the early days of the feed-in tariff are still performing strongly after 15+ years.
Most solar owners dramatically underestimate how long their systems last, the panels on your roof today could still be generating free electricity in 2050. At Fit Solar, every system comes with a 25-year panel guarantee and a 2-year insurance-backed workmanship guarantee. We also offer Fit Care to ensure your system continues to perform as expected.
Is your roof suitable for solar?
The good news: most homes are.
Solar technology has advanced significantly. Panels are more efficient than ever, and modern optimiser technology means even imperfect roofs can perform well. But three factors matter most.
- Roof direction
Best: south-facing roofs receive the most direct sunlight throughout the day and will generate the most energy overall. Still very good: east and west-facing roofs each catch strong sun for half the day. An east/west split installation can be advantageous, as it spreads generation across more hours, potentially improving self-consumption. North facing roofs are generally not recommended as a primary installation, though they can work as part of a larger system. - Roof space
A typical residential solar system requires between 20 and 40 m² of usable roof space, depending on system size. Modern panels are more compact than older models, and most standard semidetached or detached homes in Gloucestershire have sufficient space. We work with all roof types across the Cotswolds, including slate, tile, and flat roofs, as well as older and historic properties where a sensitive approach is needed. - Shading
Nearby trees, chimneys, dormer windows, or neighbouring buildings can reduce solar output, but this is often less of a problem than homeowners fear. Modern panel-level optimisers (such as those made by SolarEdge or Tigo) allow each panel to operate independently, so shading on one panel doesn't drag down the performance of the whole array. In most cases, shading can be significantly mitigated.
The only way to know for certain is a professional solar assessment.
That's exactly what we offer, and it costs you nothing.
See what solar could do for your home.
You've seen the strategies. You understand the economics. Now the only question is: what would it look like for your specific home? That's what our solar performance audit is designed to answer. We'll assess your roof, your energy usage, and your household's future plans, EVs, heat pumps, working from home and give you a clear picture of:
- Estimated annual generation for your roof and location
- Projected savings based on your actual electricity usage
- Ideal system size panels, inverter, and battery
- Battery and EV charger recommendations tailored to your household
- Payback timeline with real numbers, not marketing estimates
No pressure. Just clear numbers.
We don't employ salespeople. You'll speak with a trained solar energy expert who'll give you honest advice, even if the honest answer is that solar isn't right for you yet.
Book your free solar performance audit.
Fit solar energy independent solar experts | Stroud & the Cotswolds MCS certified
