On-Site Electricity Storage in FHS Homes
Battery storage systems complement solar PV by storing excess generation for use when panels are not producing. The FHBS includes updated commissioning guidance for on-site electricity storage systems.
How Battery Storage Works with Solar PV
Solar panels generate electricity during daylight hours, but household demand peaks in the morning and evening. Battery storage bridges this gap by storing surplus solar generation for later use, increasing the proportion of self-consumed solar energy and reducing reliance on grid electricity. This is particularly valuable as self-consumed solar electricity offsets grid electricity at full retail price, whereas exported solar receives only a fraction of that value through the Smart Export Guarantee.
Commissioning Requirements
The FHBS consultation response confirms that guidance on commissioning on-site electricity storage systems has been updated. The Approved Document references the MCS standard MIS 3012 as one way of meeting commissioning requirements, whilst recognising that other methodologies may be suitable. Guidance has been revised to make clear that following manufacturer's instructions is important, and that the Approved Document should be flexible to account for evolving technology.
Smart Tariff Integration
Battery storage enables participation in smart electricity tariffs — charging from the grid during low-cost periods and discharging during expensive peak hours. Combined with smart meters, this allows FHS homeowners to optimise their energy costs. As the electricity grid continues to decarbonise, battery storage also helps manage grid demand peaks, supporting the Clean Power 2030 mission.
Vehicle-to-Grid Systems
Some consultation respondents highlighted vehicle-to-grid systems and connections to urban microgrids as emerging technologies that should be considered alongside battery storage. While these are not specifically addressed in the current FHBS, the government has noted that these areas will be kept under review as technology and best practice continue to evolve.