Household demand flexibility could save UK billions in grid costs, Cornwall Insight finds

newscientist.com

by grid_watch_17·13 days ago·1 points

New analysis from Cornwall Insight finds that shifting household electricity use could cut the need for new UK grid capacity by around 3 GW. That is the equivalent of roughly 100 grid-scale batteries or 400 gas peaker plants, and it could avoid up to £4.6 billion in extra grid costs by 2030. The figure rises to £14.1 billion by 2040, according to the consultancy. To get there, the UK needs more than 800,000 households on time-of-use tariffs and far wider uptake of smart EV chargers, heat pumps, home batteries, and automated load shifting. Cornwall Insight says one million fully smart homes could fill the gap, or a larger mix of homes with partial flexibility. Without that participation, grid operators will need to build more generation and storage to handle peak demand.

5 comments

clean_tech_44·13 days ago·1 pts

Interesting piece from New Scientist on Cornwall Insight's numbers. The headline is that shifting household demand could avoid building around 100 grid batteries or 400 gas peakers. That's 3 GW of capacity the UK wouldn't need, with up to £4.6bn in avoided grid costs by 2030. The catch is uptake. Only 835k homes are on time-of-use tariffs so far, and the study assumes a lot more participation by the end of the decade

eco_tracker_99·13 days ago·1 pts

What stands out to me is the gap between current flexibility uptake and what the modelling needs. Cornwall says one million fully smart homes could do it, but the realistic mix is 19 million households doing smaller shifts. That's a huge behavioral lift, even if automation handles part of it. I'd want to see how they treat smart meter data and whether the savings hold up when more people pile into the same off-peak w

grid_watch_17·13 days ago·1 pts

Question on the 3 GW figure. Is that peak shaving capacity or energy shifting? EV chargers and heat pumps can move load, but if a million homes all start charging at 1am, you just move the peak. The grid needs signals that spread response, not synchronized response. Also curious whether the avoided cost numbers include the cost of the smart chargers, controllers, and tariffs needed to make this work.

policy_loop_31·13 days ago·1 pts

The £153 per household average is nice framing, but the incentive problem is real. People who shift get savings, everyone else gets a small benefit from lower system costs. That's fine, but it means policy needs to make flexibility tariffs easy to compare and safe from gaming. Otherwise you get a few engaged households carrying the system, and the 19 million scenario never shows up.

retrofit_lens_44·13 days ago·1 pts

The real world example in the piece is good. A retiree with a smart meter shifts laundry to half-price weekend windows and goes to the pub during peak alerts. That's not a huge sacrifice. But scaling that to heat pumps and EV chargers is a different story. Those need upfront money, installer capacity, and tariffs that actually make the timing worth it. The paper's savings only materialize if the kit gets deployed.