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Thermal Energy Storage (TES) Technologies

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Thermal Energy Storage (TES) Technologies ( thermal-energy-storage-tes-technologies )

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Evidence Gathering: Thermal Energy Storage (TES) Technologies 5 Market review and future development 5.1 Current UK market overview Overall, there are two primary TES technologies that have experience of widespread uptake in the UK:  Electric storage heaters (approximately 1.8 million homes in the UK use electric heating system, of which the large majority will be electric storage heaters).45  Tank based systems: o Residential systems (around 11 million systems in homes; approximately 400,000 sold per year) o Larger systems (>500 litres), selling low thousands of units each year for large residential or commercial applications. There are tens of systems in the district heating segment, where tanks are usually of a size between low hundreds to thousands of m3. Other systems have seen much more modest uptake. Based on our research there were projects identified for each underground TES technology. The number here ranges from a few single projects to low tens of installations being carried out. There is a high degree of uncertainty with regards to PTES, BTES and ATES projects, because there has been very little discussion in the literature and the projects realised are very much niche applications. Across these three technologies, the key barrier explaining the small current market is the high upfront cost and related cost sensitivity shown by building / project developers. The low uptake of PTES and BTES can also be broadly linked to the low uptake of large solar thermal in the UK – especially PTES, commonly used for the interseasonal storage of solar heat.  With regards to emerging TES technologies – PCM and THS – the commercially motivated uptake of systems remains very low. The primary development of PCM has been as part of European funded research projects, as well as BEIS’s Advanced Heat Storage Competition. For the latter a number of UK based research organisations and commercial developers investigated different applications and the technological potential of PCMs. Additionally, Scotland based developer Sunamp has installed approximately 800 units of different specification as part of the Scottish Government’s ‘Low Carbon Infrastructure Transition Programme’. 45 There is a lack of robust annual sales data specifically analysing electric storage heaters and electric heating in general. The data provided (approx. 1.8 million) is based on figures provided through industry interviews and Delta-ee analysis of various housing stock surveys such as English and Scottish Housing Surveys, DECC Housing Energy Fact File and Department for Communities and Local Government. 65

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