Turning surplus renewable energy into long‑term savings

Periods of excess electricity are becoming increasingly common as solar and wind generation grow. On bright summer weekends, the grid can produce more renewable power than it can use. While households are encouraged to run appliances during these windows, those with home batteries can go further:

• Store free or ultra‑cheap electricity when the grid is oversupplied
• Use that stored energy later, when prices rise
• Reduce reliance on fossil‑fuel‑backed peak‑time electricity
• Cut bills year‑round, not just during flexibility events

For homeowners, storage transforms the scheme from a short‑term reward into a long‑term financial and environmental strategy, whether they have installed solar to their own homes or not.

Why energy storage must become standard in new‑build housing

The UK is rapidly increasing rooftop solar installations. 2025 was the sunniest year on record, and small‑scale solar hit new highs, but without storage, much of that clean energy is exported back to the grid at low value or wasted during oversupply.

The ESA has advocated that energy storage must form part of the Future Homes Standard and by embedding storage into all new‑build homes would:

• Capture energy produced from the installed solar panel for later self-consumption
• Ensure new housing stock is future‑proofed for a renewable‑heavy grid
• Reduce pressure on local networks during peak times
• Allow households to benefit from free/cheap electricity events automatically
• Support national decarbonisation goals without relying on behavioural change
• Prevent developers from locking in outdated, grid‑dependent designs
• Help to reduce the total kVa needs for new developments and therefore bringing down costs

Just as insulation became a building‑standards requirement, battery storage is the next logical step for resilient, low‑carbon homes.

Supporting those who cannot afford storage

While homeowners with disposable income can invest in batteries, many cannot, including residents in social housing, people on benefits and households already struggling with energy costs.

If flexibility services are to be fair and effective, the benefits must be accessible to everyone. That means:

• Government‑funded storage installations in social housing
• Grants or zero‑interest loans for low‑income households
• Community scale batteries where individual systems aren’t practical
• Tariff protections so vulnerable households aren’t penalised for being unable to shift usage
• Introduce a salary sacrifice scheme for home renewable products to reduce the barrier of upfront costs for home battery systems

Without support, the flexibility scheme risks widening the energy inequality gap: wealthier households will store free electricity, while others remain exposed to high peak‑time prices.

A smarter, fairer, more resilient energy system

The updated Demand Flexibility Service shows how quickly the UK’s energy landscape is changing. As renewables grow and periods of surplus become routine, energy storage is no longer optional, it’s essential infrastructure.

Homeowners who install batteries today are early adopters of a system the entire country will eventually rely on. But for the transition to be just and effective, storage must be built into new homes and made accessible to those who need it most.