Solar Heat in the United Kingdom
Status of the Market for Solar Heat
Market Size and Trends
Although solar thermal receives the highest Renewable Heat Incentive (RHI) tariff (see section on Support Framework), the number of installations in the UK have been falling in recent years. In 2016, just over 10,000 m2 of solar water heating collectors were installed, down from 90,000 m2 at its peak in 2010 (Solar Trade Association, 2017), however figures from 2017 suggest that this decline has stopped.
Data on the contribution of solar thermal to the UK energy system is available from the Digest of United Kingdom Energy Statistics (DUKES). Since the launch of the UK Domestic Renewable Heat Incentive scheme in April 2014, around 8,000 domestic solar thermal installations have been accredited, which equates to around 22.5 MWh of solar thermal heat.
Typical Applications and Products
Typical solar thermal applications in the UK are domestic hot water systems for houses and swimming pool heating. Domestic hot water systems are generally forced circulation systems with 150 to 250 litre tanks and 2 to 5 m2 of flat plate or evacuated tube collectors. Flat collectors account for the larger share of the market; many of these systems are roof-integrated which are designed to replace roof tiles.
Several metal cladding companies offer active solar air heaters as part of their product portfolio. Since their introduction to the UK market in 2005, approximately 14,000 m2 have been installed, with the largest being a 4,334 m2 collector installed on the Marks & Spencer (M&S) distribution centre at Castle Donington.
Main Market Drivers
In the case of new build housing, building regulations focus on carbon emissions rather than energy consumption; with the availability of relatively low carbon gas delivered through a comprehensive national network and relatively high carbon electricity, small solar photovoltaic (PV) systems can often help meet carbon emissions targets more cost effectively than solar thermal and so have become the favoured approach when selecting a solar technology to help meet regulations, except for off the gas grid where solar thermal is a more competitive solution.
Other Key Topics
Status of the Market for Solar Buildings
- IEA SHC || IEA SHC || Solar Heat Worldwide Markets and Contribution to the Energy Supply (no date). Available at: http://www.iea-shc.org/solar-heat-worldwide (Accessed: 11 May 2019).