Northern Powergrid's BEET trial trims grid voltage to what appliances actually need

Keith Jackson, a retired engineer in Boston Spa, West Yorkshire, brought Northern Powergrid an idea: use real-time smart-meter data to optimise network voltage levels and deliver CO2 and cost savings for the local community. The utility turned it into the Boston Spa Energy Efficiency Trial — BEET — which began in January 2024 with about 15,000 homes and businesses.

The trick is that homes have historically received a higher voltage than most domestic appliances need to work effectively, because voltage regulations push suppliers high. A specially developed BEET-box uses the smart-meter data to safely turn voltage up or down to the level appliances actually require — trimming waste with no change in behaviour. Participants could save £28 a year on average and up to 20kg of CO2 each.

The prize at national scale is what makes the mechanism more than a curiosity: Northern Powergrid says a national roll-out could save the UK up to 1.1 million tonnes of CO2 annually and cut consumer bills by up to £770 million. If the trial succeeds, the firm plans to expand 'across the majority' of its 3.9 million-home network by 2033.

The idea reframes voltage headroom — a compliance habit — as measurable waste that smart meters can now see.

The saving requires zero behavioural change from households, which is what makes a 15,000-home trial and a national roll-out plausible.

It came from outside the utility: a retired customer saw the slack the engineers had normalised.

Look for the buffer everyone over-provisions because a rule told them to: if you can measure demand in real time, you can safely shave the slack and keep the compliance.

The trial has been running since January 2024; if successful, Northern Powergrid intends to extend voltage optimisation across the majority of its 3.9 million homes and businesses by 2033.