There are several ways to cut the cost of going solar in 2025. The big ones are the Smart Export Guarantee (where you get paid for excess electricity), 0% VAT on home installations, and various local council grants. If you qualify as low-income, the ECO4 scheme might even cover most of your installation costs.
Over 1.3 million UK homes now have solar panels, largely because these incentives have made the numbers work so well. The government’s clearly serious about hitting net-zero targets, and solar incentives are a key part of making that happen.
Smart Export Guarantee – getting paid for your surplus
The SEG replaced the old Feed-in Tariff and is basically how you get paid for any excess electricity you send back to the grid. Every major energy supplier has to offer this if they’ve got more than 150,000 customers.
How it works: You get paid per unit (kWh) of electricity you export, with rates typically ranging from 3p to 15p per kWh. Some suppliers offer fixed rates, others vary theirs based on demand.
What you might earn: A typical 4kW system generates about 3,400 kWh annually. If you export half of that, you’re looking at £51-£255 per year depending on which supplier you choose. The best rates currently come from companies like Octopus Energy and Good Energy.
The beauty is this income continues for 25+ years – essentially free money for electricity you weren’t using anyway.
VAT savings – an immediate 20% off
Since April 2022, there’s no VAT on home solar installations. That’s an instant 20% saving on everything – panels, batteries, inverters, and installation costs.
What this means in practice: On a typical £8,000 installation, you save £1,600 immediately. This alone has shortened payback periods by 1-2 years and made solar much more accessible.
The relief covers integrated systems including batteries and smart inverters, so you can build a comprehensive renewable energy setup without the VAT hit.
Local council grants – worth checking
Many councils offer additional support, though it varies massively by area and what funding’s available.
What councils might offer:
- Direct cash grants (£500-£2,000)
- Interest-free loans for installations
- Reduced planning fees
- Group buying schemes that cut costs
How to find out: Check your council’s website (look for environmental or sustainability sections), call their energy efficiency team, or search online for “solar grants” plus your postcode. London boroughs tend to be particularly generous with solar funding.
Some councils operate seasonal programs with limited budgets, so timing matters. It’s worth asking installers too – they often know what’s currently available locally.
ECO4 scheme – for qualifying households
This runs until March 2026 and provides funding for energy improvements including solar, but only for eligible low-income households.
Who qualifies:
- Household income under £31,000 annually
- Receiving certain means-tested benefits
- Living in poorly insulated homes (energy rating D-G)
- Vulnerable households with health conditions
What it covers: ECO4 can fund 70-100% of your solar installation, plus batteries in some cases. It also covers insulation and heating improvements as part of a whole-house approach.
Applications go through approved suppliers and installers. The scheme prioritizes homes with the worst energy efficiency where improvements will have the biggest impact.
Energy supplier extras
Beyond SEG payments, many suppliers offer additional perks to encourage solar adoption.
Supplier-specific deals:
- Octopus Energy – referral bonuses and smart tariffs for solar households
- British Gas – financing packages and maintenance deals
- E.ON – bundled solar, battery and smart home packages
- SSE – cashback schemes and better SEG rates
Time-of-use tariffs can boost your earnings by paying higher rates for electricity exported during peak demand periods – potentially 20-40% more than standard SEG rates.
Some suppliers also pay £50-£200 for successful referrals, creating extra earning opportunities.
How grants affect the overall numbers
Combining incentives can dramatically improve your investment case.
Example cost breakdown:
- Standard 4kW system: £8,000
- Less VAT relief (20%): -£1,600
- Less council grant: -£1,000
- Net cost: £5,400
Payback calculation: With electricity at 34p per unit and SEG at 15p per unit:
- Annual bill savings: £800-£1,200
- Annual SEG income: £150-£250
- Combined benefit: £950-£1,450 per year
- Payback period: 4-6 years
Making the most of available support
Do this now:
- Research what your council’s offering
- Compare SEG rates from different suppliers
- Check ECO4 eligibility if you might qualify
- Get multiple quotes that reflect VAT savings
Timing matters: Council grants often work first-come, first-served. SEG rates can change quarterly. ECO4 might get oversubscribed before the March 2026 deadline.
Working with experienced installers helps navigate this complexity and ensures you don’t miss out on available support.
What’s coming next
The government keeps tweaking incentives to meet net-zero targets by 2050.
Potential changes ahead:
- Better battery storage incentives
- Possible VAT relief for commercial properties
- Higher minimum SEG payment rates
- New grants for combining solar with heat pumps
Even without specific incentives, rising electricity prices and falling solar costs make the investment case stronger every year.
The bottom line
UK solar incentives provide multiple ways to reduce costs and boost returns. The combination of immediate savings (VAT relief), ongoing income (SEG), and potential grants can dramatically improve payback periods.
For most homeowners with suitable roofs, the question isn’t whether solar makes financial sense – it’s about maximizing the available support to get the best possible return on investment.
The current incentive landscape is probably as good as it’s been since the original Feed-in Tariff. With electricity prices staying high and technology costs falling, now’s an excellent time to go solar whilst government support remains strong.
Want to see what incentives apply to your situation? Use our calculator or learn about available grants for solar installations in your area.