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This four-part Digest provides information on renewable energy technologies commonly used in domestic buildings.Part 1 provides a basic understanding for people who have little or no prior knowledge of solar photovoltaics (PV), and for engineers and architects who wish to know more about the technical details of PV modules.Part 2 provides an overview of the technical and operational characteristics of biomass systems within the scope of the Microgeneration Certification Scheme (MCS). Standards and specifications are covered, including certification, safety and incentives such as the Renewable Heat Incentive and the Green Deal.Part 3 describes the different types of heat pump system and how they operate. Installation requirements, including integration with the building’s heating system and the steps that should be taken to ensure their safe and efficient operation, are also discussed and methods for estimating their annual energy performance are identified.Part 4 describes the different types of solar thermal system and how they operate. Installation requirements, including integration with the building’s hot water system and the steps that should be taken to ensure their safe and efficient operation, are also discussed and methods for estimating their annual energy performance are identified.