The purpose of this guide is to provide designers, installers, and practitioners with a clear understanding of the requirements and typical modes of operation for a Prosumer's Electrical Installation (PEI). It outlines the terminology and design philosophy of a PEI, including its various types and modes of operation, and explains the integration of its components. Additionally, the guide offers insights into potential electrical safety issues associated with a PEI and details the specific requirements of BS 7671 to mitigate these risks. It also discusses the technical challenges related to PEI and describes the role of energy management systems and the necessary interfaces to optimize the operation of a PEI.