Ground-source heat pumps installed in public parks in Scotland could supply up to 4.5TWh of low-carbon heat each year – enough to meet the demand of 15 per cent of Scottish households. The findings were extrapolated from a survey of 3,500 sites conducted by Greenspace Scotland, which sought to gauge their potential to host low-carbon energy resources such as heat pumps and solar panels and help meet the country’s target of reducing emissions to net zero by 2045.