E.ON Next will cut up to £700 from the cost of solar panels and battery storage for its customers this spring. The offer, announced on 27 March, applies to installations booked through the supplier’s approved partner network and runs until 31 May 2025.
As reported by Eon Energy, the discount is part of a broader spring promotion aimed at encouraging more households to adopt solar generation ahead of the summer months. But the headline figure masks some important caveats for anyone thinking of signing up.
What £700 actually buys, and what it doesn’t
A typical 4 kW solar panel system with a 5 kWh battery costs between £9,000 and £12,000 installed, according to Energy Saving Trust figures. A £700 discount on that range is a saving of roughly 6% to 8%, not transformative, but meaningful.
The catch is that the discount only applies if you use E.ON Next’s installation partner, and the supplier hasn’t published a full price list. Without seeing the baseline quote, a householder cannot know whether the partner’s standard price already includes a margin that absorbs part of the discount. The same warning applies to any supplier-led solar offer: always get at least three independent quotes before committing.
What the discount does do is reduce the upfront cost barrier, which remains the single biggest reason UK households give for not installing solar. Ofgem data shows that fewer than 5% of homes had panels at the end of 2024, despite average payback periods falling below 12 years for most of England.
Who qualifies, and who doesn’t
The offer is limited to current E.ON Next electricity customers. If you are with another supplier, you would need to switch to E.ON Next to claim the discount, though switching is straightforward and takes about two weeks under Ofgem’s switching rules.
Households on prepayment meters or with outstanding debt on their energy account may face additional checks before the discount is applied. E.ON Next has not published full eligibility criteria, so anyone interested should call the supplier directly and ask for written confirmation of the terms before proceeding.
Renters and leaseholders face a separate barrier: permission from the landlord or freeholder is almost always required for roof-mounted solar. The discount does not change that legal reality.
EPC impact and longer-term savings
Adding solar panels and battery storage can lift a home’s Energy Performance Certificate rating by one or two bands, depending on the existing insulation and heating system. A move from EPC D to C, for example, can increase a property’s value by around 1–2% according to estate agent surveys cited by the HomeOwners Alliance.
The battery component is particularly valuable for households on time-of-use tariffs. Owners can charge the battery during cheap off-peak rates, typically 7p–9p per kWh on Economy 7 or smart tariffs, and use that stored power during peak evening hours when rates can exceed 30p per kWh. Over a year, that arbitrage alone can save £300–£500 for a typical 3-bed semi, according to analysis by the Renewable Energy Assurance Scheme.
Export payments under the Smart Export Guarantee add another £80–£160 annually, depending on the tariff. The combination of avoided purchases and export income means a well-sited system can pay back in under 10 years even before the £700 discount.
What to do next
If you are an E.ON Next customer and have a south- or east-west-facing roof with little shading, this offer is worth exploring, but only alongside independent quotes. Request a written quote from E.ON Next’s partner and compare it to at least two MCS-certified installers from the Energy Saving Trust’s database.
Check that the battery is a modern lithium-ion unit with at least a 10-year warranty, and confirm that the inverter warranty matches. Ask whether the price includes scaffolding, bird-proofing and an export meter. If any of those are extra, the £700 saving could vanish.
The spring sun is already delivering higher generation than winter. Households that install by June can capture the best generation months of the year. Applications for the E.ON Next discount close on 31 May 2025.
Frequently Asked Questions
E.ON Next is offering up to £700 off solar panel and battery installations for customers who book through their approved partner network by 31 May 2025. On a typical 4 kW system with a 5 kWh battery costing between £9,000 and £12,000, this is a saving of roughly 6% to 8%. However, the baseline price isn't published, so it's wise to get at least three independent quotes to ensure you're getting a genuine deal.
The offer is only available to current E.ON Next electricity customers. If you're with another supplier, you'd need to switch to E.ON Next, which takes about two weeks under Ofgem's rules. Households on prepayment meters or with outstanding energy debt may face additional checks, and renters need landlord permission for roof-mounted solar.
Yes, adding solar panels and battery storage can lift your Energy Performance Certificate rating by one or two bands, depending on your existing insulation and heating. For example, moving from EPC D to C can increase a property's value by around 1% to 2%, according to estate agent surveys cited by the HomeOwners Alliance.
With a battery, you can charge it during cheap off-peak rates (typically 7p to 9p per kWh on Economy 7 or smart tariffs) and use the stored power during peak evening hours when rates exceed 30p per kWh. This arbitrage can significantly reduce your electricity bills, especially combined with solar generation.
As of end 2024, fewer than 5% of UK homes had solar panels, according to Ofgem data. The main barrier is the upfront cost, despite average payback periods falling below 12 years for most of England. Supplier discounts like E.ON Next's £700 offer help reduce this barrier, but always compare with independent quotes.
