The Customer-Led Network Revolution Solar PV trials investigated domestic customers’ electricity usage and PV array output for three groups of customers; a control group with Solar PV panels but without any intervention (test cell 5) and two groups with interventions designed to test the demand flexibility of customers and their ability to use their own generation: either a manual in-home display to help the customer actively manage their generated electricity (test cell 20 IHD), or automatic within-premises balancing of excess generation to a water heating system (test cell 20 Auto)