Question to the Department for Energy Security & Net Zero:

To ask the Secretary of State for Energy Security and Net Zero, if he will make an assessment of the potential merits of providing equal incentives for homeowners to install (a) heat batteries and (b) other low-emission heat sources.

Heat batteries are a promising technology because they utilise time-of-use tariffs, do not require outside space, and can be cheaper to install than heat pumps in some circumstances. However, they are less efficient than heat pumps and will therefore use more energy to meet the same heating demand.

The Department is exploring, through studies like the Homes for Net Zero Trial, the role heat batteries could play in the future. As the evidence base develops, we will continue to review the incentives available and whether this is sufficient, appropriate, and in line with our net zero ambitions.