Somebody in the National Grid control room in the UK has a sense of history.
— NG Control Room (@NGControlRoom) 21 April 2017
NG is greatly understating the length of the British coal story. The 1880s were when electrical power stations began. But the switch to coal in England was already under way in 1600, as the trees ran out and wood prices soared. The first Industrial Revolution in the 18th century depended on coal. The steam engine was invented to pump water out of mines. Since coal is no longer burnt for anything else than electricity, the day marks the end of the four-century coal era in the first modern industrial country.
National Grid are noticeably not moaning about their loss of “baseload” coal plants, unlike Rick Perry. In her successful 1989 electricity privatisation, Margaret Thatcher split transmission, a technical monopoly, from generation, which can and should be competitive. National Grid started out in the public sector; it was later privatised, but remains tightly regulated with a public-interest mandate and no generating assets. (In the US the company operates as a conventional mixed utility). The model, as good ideas tend to do, has spread to Texas, Australia, China, India, Denmark, and Germany, and no doubt others. These grid operators are uniformly phlegmatic about the energy transition. They publish reports about how to integrate 20%, 40%, 100% renewable electricity in their grids, how to fix the problems, and how much it will cost. They never SFIK say: stop this, we can’t cope, a secure supply requires baseload coal or nuclear plants. You only hear this biased testimony from the old-fashioned silo monopolies in parts of the USA and in Japan.
Another telling detail is the little gaps in the chart. The few surviving British coal generators have not been running at night. This is orthodox Econ 101: the grid control room has a merit order list of generators, and will call on the cheapest first. Renewables have zero marginal cost, and therefore go first when demand is low in the small hours. Orthodoxy is terrible for the owners of coal plants, which were designed and financed on the assumption that they will run as “baseload”, that is almost all the time, with spikes in demand met by more expensive gas generators. This effect is cutting into the returns from coal plants, in Germany, Texas, Colorado, and India, even faster than the slide in the comparative LCOE of new build.