I’ve yet to see any new builds near us with heat pumps. My grandsons new house ( late 2024) is gas fired CH, and the houses still being built on his development are not with heat pumps. Given we are falling short of the house building target of 300,000 per year and barely achieving 200, 000 per year it’s going to be some time before heat pump installations affect the grid supplies.
But there are new inter connectors from Scotland coming south, and a backlog of offshore wind farms requiring connecting to the grid. Near us new solar farms have associated battery storage, some with diesel generation too. In wider UK larger battery storage is also being built, as is the new Hinckley Point C, and Sizewell C in the future. One aspect not to be forgotten is that new electric cars are starting to have the ability to feed power back in to the grid, the new Nissan Leaf, being a good example. There is also a steady rise in home owners installing solar and battery systems which either reduce the load on the grid, or can put power in to the grid. Even today, a relatively low wind day, Gridwatch reports 49% from wind,and gas at 10%. So it’s not all doom and gloom, progress is being made, but not widely reported.