Social housing residents cut energy bills by up to 60% and earn up to £160 a year

FlatSave is a UK first, combining shared solar, a communal battery and grid flexibility for flats.

Powered by Allume’s SolShare technology & E.ON Next

Get access to funding now

30 minutes with a specialist for a free assessment.

What is FlatSave?

FlatSave is the UK’s first shared solar and battery solution for social housing flats. For the first time, a whole block can share one rooftop solar system and one communal battery – and residents get paid when that battery supports the grid, without switching energy supplier.

Allume’s SolShare technology shares the solar and battery power fairly between every flat. E.ON Next uses the battery to help balance the grid and pays residents who opt in.

Residents like Lorraine at Harper Court in Stevenage are already saving.

Delivered by	Allume & E.ON Next
Technology:	SolShare, a communal battery and E.ON Next grid flexibility
First building:	Harper Court, Stevenage (Peabody)
Who it’s for:	Housing associations, councils and social landlords with blocks of 6 or more flats

For residents

Every flat gets solar and battery savings from day one. Residents who opt in also get a yearly flexibility payment:

Resident’s supplier	Flexibility payment
E.ON Next	Up to £160 a year
Any other supplier	Up to £80 a year

For housing providers

Better EPC ratings - 5–20 SAP points per flat, helping blocks reach EPC C by 2030.
Battery storage for social housing - usually means one battery per flat. FlatSave uses one communal battery for the whole block.
Funding-ready - SolShare is accepted under all major decarbonisation grants, including the Warm Homes Plan.
Minimal disruption - work centres on the roof and the meter area, not inside homes.
Clear reporting - the SolCentre dashboard shows energy and savings data from site to flat level.

How does FlatSave work?

1) One solar array, one communal battery
SolShare connects one rooftop solar system and a communal battery to multiple flats. Nothing is installed inside homes.

2) SolShare shares the power fairly
During the day, SolShare sends solar and stored energy straight to the meters of the flats using power right now. Everyone gets their fair share.

3) The battery tops up overnight
It charges from the grid when electricity is cheapest.

4) Stored power at peak times
When demand and prices rise, the battery powers the flats or sends energy back to the grid to ease pressure on the network.

5) Residents get paid
Residents who opt in receive a yearly flexibility payment from E.ON Next.

Harper Court project

Housing provider	Flats	Solar	Battery
Peabody	6	15kW	18kWh

The challenge

In a house you can add solar and a battery. In a block of flats, residents often can’t access the roof or have no space or budget for a battery.

What was installed

Funded by E.ON Next, SolShare was installed to connect all flats to a solar PV & communal battery system behind the meter.

The results

Increased flats’ EPC ratings, 10-20 SAP points.
Energy bills down significantly.
A credit buffer built up for winter.
£160 cash payment from the battery.
Straightforward, non-disruptive installation with no hardware inside homes.

“I was having to choose between putting the heating on versus using the oven. The solar and battery system means I don’t have to choose between cooking and staying warm.”

Peabody' Harper Court resident

The launch story

Built on SolShare's track record

We developed SolShare, the world-first technology behind FlatSave, to unlock rooftop solar & batteries for people living in flats. SolShare is a smart hardware device that connects one rooftop solar & communal battery system to every flat in a block and shares the energy fairly, so everyone gets their fair share.

15000

+

Flats connected worldwide

30 new households connected every day

28

GWh

Clean electricity generated worldwide

60

%

Reduction in electricity bills

Be one of the first housing providers to offer FlatSave

E.ON Next is rolling out FlatSave to more social housing blocks this year and into 2027, and places are limited.

Book a free assessment to check if your blocks qualify.

Frequently asked questions

Find quick answers about FlatSave.

Read more FAQs

Who can get FlatSave?

Housing associations, councils and social landlords, for whole blocks of 6 or more flats. Each SolShare unit serves up to 15 flats, and larger blocks use several units on the same system.

Do residents need to switch to E.ON Next?

No. FlatSave works behind the meter, so residents keep their existing supplier and tariff and still get the solar savings. Residents who opt in to flexibility payments can receive up to £160 a year with E.ON Next, or up to £80 a year with another supplier.

How much can residents save with FlatSave?

We estimate residents can cut their electricity bills by roughly 30–60% with solar and battery. This is modelled from 12 months of metered data at a 24-flat SolShare and battery site in Cardiff. Savings vary by building, system size, tariff and how much energy each household uses.

How do flexibility payments work?

The communal battery charges from the grid when electricity is cheapest and releases power when demand peaks, which helps balance the local network. E.ON Next pays residents who opt in for this flexibility each year.

What’s the difference between SolShare and FlatSave?

SolShare is Allume’s technology for sharing one rooftop solar & battery system between flats. FlatSave adds E.ON Next’s grid flexibility, so residents can also be paid for the energy their building stores. Learn how SolShare works ›

How disruptive is the installation for residents?

Very little. The work centres on the roof and the building's meter area. At Harper Court, residents described the installation as straightforward and non-disruptive.

What funding is available?

SolShare is accepted under the Warm Homes Plan. In Wales it's used through the Optimised Retrofit Programme, and in Scotland through the Social Housing Net Zero Heat Fund.

What funding is available for SolShare?

SolShare qualifies for major UK grants, including the Warm Homes Plan in England, Optimised RetroFit Programme (ORP) in Wales and Social Housing Net Zero Heat Fund in Scotland and the Local Power Plan.

Contact us for guidance on securing solar funding.

Is there a monitoring portal with SolShare?

Yes. The SolCentre monitoring portal provides energy and bill savings data from site to flat level. This transparency is often a requirement for Warm Homes and other social housing initiatives. These metrics shows measurable impact for Government reporting, without manual admin.