Who pays for the absence of energy efficiency?

Here's an example on a small scale of what can be achieved by a combination of efficiency and time shifting of electricity demand, courtesy of a yes you've guessed American company, CP Power

They have almost halved the peak consumption of an industrial user in this example.

Were we to halve our peak consumption in UK, we would save around 25 GW and £200 billion in new capacity and distribution costs at Hinkley C prices.

Each GW we save from the peak is worth £8 billion. How long before we save the first one?!