Could battery storage soon surpass solar?
18 May 2026
UK energy is shifting from solar-led generation to battery-first flexibility, as home storage rapidly scales, enabling price arbitrage, grid services, and a more decentralised, resilient electricity system – so says David Sheldrake, CRO, POWWR
For more than a decade, solar energy has dominated the UK’s clean energy conversation. Supported by early subsidies, falling costs, and rising public concern over climate change, rooftop solar panels have become a visible symbol of decarbonisation. Today, more than 1.6 million UK homes have solar panels installed, representing approximately 17 GW of cumulative capacity.
However, a quieter but potentially more disruptive eco technology is now emerging. Battery storage is moving rapidly from a niche add-on to a standalone energy investment that could reshape how UK households and businesses consume, store, and interact with electricity.
As energy price volatility persists, grid constraints tighten, and consumers demand greater control over bills and resilience, I see no reason for this trend to show any signs of slowing.
The UK energy context
The UK grid is under mounting pressure. Electricity demand is rising rapidly as transport and heating goes electric. While the generation mix is becoming increasingly dependent on variable renewables. In fact, over the past year, approximately 40% of the UK’s energy came from renewable sources.
At the same time, pricing models is shifting. While most homes and businesses remain on flat rate tariffs, flexible time-of-use (ToU) pricing is expanding, buoyed by enhanced smart meter rollout and Market-wide Half-Hourly Settlement (MHHS). So much so, that recent analysis shows that around 9% of UK households are now on flexible ToU tariffs, with much higher adoption among “tech affluent” households that own EVs, heat pumps, or batteries.
This matters because flexibility – rather than generation alone – is becoming one of the most valuable assets in the energy system. Batteries are uniquely positioned to monetise that flexibility.
How battery storage creates value
A home battery allows consumers to buy electricity when it is cheap and use or export it when it is expensive. This price arbitrage is increasingly attractive as peak-to-off-peak spreads widen.
Crucially, UK batteries do not require solar panels to be economically viable. Battery-only installations can charge overnight on low-cost tariffs and discharge during the evening peak. This is a critical distinction from solar, which depends on roof suitability, export conditions, and the sun to shine.
Modern lithium-ion batteries are compact, wall-mounted, and increasingly standardised. Installers report that battery-only systems can often be deployed faster and with fewer planning constraints than rooftop solar.
Rapid growth of adoption
UK adoption of battery systems is accelerating quickly. In 2024 alone, more than 22,000 home battery systems were installed, bringing total installed domestic storage capacity to over 400 MWh. Monthly MCScertified battery installations rose from dozens per month in 2022 to over 1,000 per month in 2024, signalling a shift from early adopters to mass-market uptake.
Market forecasts reflect this momentum. The UK residential battery storage market was valued at approximately USD 4.6 billion in 2025 and is projected to grow to USD 15.9 billion by 2031, a compound annual growth rate of over 23%.
Batteries vs solar
Solar remains highly effective where conditions allow, but it faces structural limitations. Less than one in twenty UK households currently have solar, and uptake is heavily skewed toward detached, owner-occupied homes in the South of England.
Batteries, by contrast, are viable in flats, shared occupancy offices, shaded buildings, and other areas where solar is impractical. They also align more directly with how UK electricity is priced, rather than how it is generated.
The rise of virtual power plants
The system-level implications of the move to battery storage are significant. Even modest adoption (say 20% of UK homes and businesses installing batteries) would represent several gigawatts of highly responsive, distributed capacity.
Through virtual power plants (VPPs), home batteries are already being aggregated to provide grid services such as peak shaving and reserve capacity. Platforms operated by Octopus Energy, SolarEdge, Kraken, and others are all integrating thousands of domestic batteries into flexibility markets.
And not a moment too soon. Recent policy analysis suggests the UK will require 23–27 GW of battery storage by 2030 to maintain stability, with 10–15 GW expected to come from behind-the-meter assets, underscoring the strategic importance of household participation.
High-profile entrants accelerate awareness
Brand recognition is accelerating adoption. Tesla’s Powerwall has helped normalise battery storage as a mainstream household technology, and in March 2026 Tesla received Ofgem approval to supply electricity directly in Great Britain, signalling deeper integration between batteries, tariffs, and grid services.
This visibility drives education. Not only among consumers, but across installers, suppliers, and regulators alike. Lowering friction across the value chain.
Future of the grid
Home battery storage is emerging as one of the most important developments in the UK residential energy market While solar will remain a cornerstone of decarbonisation, the future of the UK grid may ultimately be defined not by how electricity is generated, but by how intelligently it is stored, shifted, and deployed.
As UK consumers shift focus from energy generation to energy management, storage becomes the logical focal point. In many cases, solar may evolve into an optional addon to a battery-first strategy, rather than the other way round.
