The UK is accelerating its clean energy journey, with solar power expanding rapidly across homes, businesses, and dedicated solar farms. Government ambitions now target up to 47GW of solar capacity by 2030 as part of the Clean Power 2030 mission—a significant step towards a lower-carbon, secure energy future (Government action plan).
Solar’s benefits go beyond cutting emissions; solar improves energy security and reduces our reliance on imported fossil fuels. However, as clean electricity supply grows, it’s just as important to ensure that demand—especially for heating our homes—keeps pace. The energy transition isn’t only about generating clean power, but about making sure increasing numbers of households use it in smart, flexible ways to cut out fossil fuels for good.
The energy transition is about demand, not just supply
Most energy conversations focus on building and connecting more renewables. But to truly decarbonise, we need households and businesses to match that clean supply with flexible electricity demand—by electrifying transport, industry, and crucially, home heating.
If our clean energy supply races ahead of flexible demand, we risk wasting valuable renewable electricity. This can mean periods when clean power goes unused, making grid management more complex and ultimately raising system costs for everyone. It’s not the rising solar capacity that’s the issue—it’s whether clean home heating demand, such as from heat pumps and heat batteries, is growing at the same rate.
Comparing solar, heat pumps, and electric vehicles
Let’s look at recent progress:
- In 2025, the UK added around 3.6GW of new solar PV, contributing about 3.5TWh of clean electricity each year.
- 125,037 heat pumps were sold that year, representing roughly 0.7TWh in new annual electricity demand.
- 473,000 zero-emission cars were registered, adding another estimated 1.4TWh per year.
Together, these create about 2.1TWh in new demand—far less than the clean electricity we’re adding with new solar. Even accounting for seasonal and daily patterns, clean power supply is outpacing flexible demand.
Why flexible electricity demand matters
For a reliable, affordable low-carbon grid, when and where electricity is used must keep step with when and where it’s generated. Without enough flexible demand, the system risks higher costs and missed opportunities to cut carbon. This affects us all: consumers ultimately fund upgrades, storage, and balancing measures through bills, standing charges, or tariffs. Ofgem’s regular standing charge updates reflect this complex relationship.
So, the goal isn’t just to use more electricity—but to use it smartly and flexibly to replace fossil fuels in homes, supporting a robust, efficient grid.
Clean heat: the UK’s biggest opportunity
Most UK homes still depend on fossil fuels for heating. Decarbonising heat is both a challenge and one of our biggest chances to cut emissions and energy bills. Moving to electric heat—especially with heat pumps and heat battery solutions—can transform how homes are heated while making best use of clean energy.
Heat pumps are vital and are growing fast—but they’re not the only answer. Not all homes are suited to them, and different households need a range of low-carbon options.
The role of heat batteries
The Government recently confirmed plans to include heat batteries in the Boiler Upgrade Scheme, supporting households to upgrade their heating affordably. Solutions like the tepeo heat battery boiler, the ZEB – a 4.5-star-rated British-made heat battery boiler store electricity as heat, then deliver heating and hot water whenever it’s needed. Smart charging lets users tap into cheaper, greener periods and use stored heat during peak times.
As renewable generation grows, this kind of flexibility is increasingly valuable—cutting costs, carbon, and grid strain. While heat pumps, insulation, energy storage and network upgrades will all play a part, heat batteries expand the toolkit for homes where alternatives may not be the right fit.
Clean Power 2030 must include demand planning
Solar is essential to a cleaner, more secure energy mix—but generation alone is not enough. If flexible, clean demand doesn’t keep up, the transition will be slower, costlier, and less effective.
Accelerating clean home heating, by supporting policies, a range of low-carbon technologies, smart tariffs, and making electricity an attractive, accessible choice, helps rebalance our energy future and support Net Zero.
With Clean Power 2030, generating more clean electricity is vital. But using that power – smartly and flexibly is equally critical.
Looking for a reliable, affordable low-carbon heating option? See how the heat battery boiler works, and how you can benefit from tepeo’s £2,500 early grant match for eligible households.
Frequently Asked Questions
What is clean electricity demand?
This means using electricity to replace fossil fuels for heating, transport, and in industry. In homes, examples include heat pumps, heat battery boilers, and other innovative low-carbon heating technologies.
Why does solar power require flexible demand?
Solar generation varies by the hour and season. Flexible demand helps match electricity use to times when renewables are plentiful – maximising value for households and the grid.
Do heat batteries qualify for the Boiler Upgrade Scheme?
Yes. The UK Government has announced that heat batteries will qualify for a £2,500 grant under the Boiler Upgrade Scheme, subject to standards being confirmed, from winter 2026. For the latest details, review Government guidance and visit tepeo’s scheme page.
Are heat batteries and heat pumps the same?
No. Heat pumps transfer heat from the air, ground, or water into a home. Heat batteries store electricity as heat for later use. Both can help homes move away from fossil fuels.
Why is clean heat crucial for Clean Power 2030?
Clean Power 2030 is not just about generating more renewable electricity but also about increasing demand in ways that support grid stability and cut carbon. Decarbonising heating is a huge part of this, since most UK homes still burn fossil fuels for warmth.
Sources and methodology
This article uses publicly available Government and industry sources, alongside high-level calculations based on stated assumptions. The figures are intended to illustrate the broad scale of clean electricity supply and demand growth, rather than provide a detailed electricity system model.
Key sources include:
- The UK Government’s Solar Roadmap, which sets out the ambition to reach 45–47GW of installed solar capacity by 2030.
- Solar Power Portal reporting on estimated UK solar PV capacity added in 2025.
- CIBSE reporting Heat Pump Association data on UK heat pump sales in 2025.
- GOV.UK vehicle licensing statistics for 2025 zero-emission car registrations.
- GOV.UK announcements and consultation documents relating to the expansion of the Boiler Upgrade Scheme to include heat batteries.
- Energy price cap information from Ofgem and consumer guidance sources.
The demand estimates are based on the following assumptions:
- 125,000 heat pumps × 5.5MWh annual electricity use = approximately 0.7TWh of annual electricity demand.
- 473,000 zero-emission cars × 9,000 miles per year ÷ 3 miles/kWh = approximately 1.4TWh of annual electricity demand.
- New solar PV generation is estimated using a high-level UK solar output assumption and should be treated as indicative.