The sources of our future electricity are really quite simple but Whitehall, with the best of intentions, is doing their best to mess things up. Renewables, largely wind and solar, will provide the lion’s share at best value – or something close to that. But what about the rest?
In 2022, a record 41.5 per cent of electricity came from renewables. “Around 72 per cent of renewable fuels are used for electricity generation, a third of which is lost in the conversion process.” This illustrates the care that must be taken in distinguishing renewables’ capacity from contribution to demand. The former is the nameplate output from an energy source like wind, if the wind blew at an optimal level all year long and it could all be used for electricity generation with no wastage. Politicians, when discussing renewables, like to talk about capacity, which they can control by commissioning more windfarms, rather than share of demand which depends on weather and which they therefore cannot control.
Even estimating 2020 needs care: UK electricity demand fell 4.7% in 2020 to 281 TWh due to Covid and “UK total electricity generation in 2020 was 312 TWh” but the former figure is demand and the latter is generation. In 2019 “primary electricity” was 11.6 per cent of UK energy consumption so if total energy consumption in 2050 remains about the same but has become 100 per cent electricity, the electricity market will need to have grown by eight times. To maintain its 40 per cent share, renewables would need to match that growth.
An eightfold increase in the size of the 2050 electricity market may be too high. The Government estimates that the total electricity demand in 2050 could range from 370 TWh to 570 TWh, depending on the level of electrification and energy efficiency. This is clearly too low. McKinsey’s predicts that the electricity demand could reach 800 TWh. Nearer the mark.
National Grid ESO, in one of their future energy scenarios for 2050, think that the range of capacity required for electricity will be between 285 and 387 GW to deal with annual demand up to between 570 TWh and 726 TWh. They estimate that the wind and solar capacity will be between 149GW and 239GW which leaves between 135GW and 148GW to supplied by nuclear and fossil fuels with carbon capture.
That compares with government expectation that the 2050 electricity capacity will total 96GW with nuclear supplying 25 per cent of that. About 6.4GW of that will be provided by Hinkley Point C, approved 2016, and its twin Sizewell C, frequently announced but still not approved. 24GW is too small a target for nuclear and would leave over 100GW to be supplied by fossil fuels, deeply unpopular even with carbon capture. Industry sources, that cannot be quoted, reckon that 48GW would be a far more realistic target.
Hinkley was supposed to be built by 2020 at a cost of £12 billion; the latest estimates are completion in 2031 and a £44.3 billion bill. Apparently “there were 7,000 substantial design changes required by British regulations that needed to be made to the site, with 35% more steel and 25% more concrete needed than originally planned.” Of course we fully understand that, seven years after approval, the designers could have had little idea how much steel or concrete was required or what the regulations would be.
Sizewell C was touted as costing a mere £20 billion because of the savings from being the Hinkley Point C twin. Professor Thomas of Greenwich University thinks £40 billion is more likely with a 10 – 12 year construction time, i.e. 2036 if a decision is made this year.
It is astonishing that the government is hell bent on continuing with these monsters. They are planning another six large reactors (albeit smaller at around 1 GW) after Hinkley and Sizewell. Assuming this plan for the larger reactors is implemented, then we would need about 120 SMRs @ £300 million each to be up and running by 2050. No sign of that in government plans.
Large reactors take at least 10 years to build and will be providing electricity to the Grid at a price which is estimated to be at least 50% more expensive than the forecast price for electricity from Small Modular Reactors (SMRs). SMRs should take about 6 months to build in a factory or shipyards and about 2 years to install for the first unit of a multi-SMR facility with installation times falling to 12-18 months per subsequent unit. The reason Sizewell C took so long to gain approval was that no one but HM Treasury was stupid enough to invest in it. Even the French who own the EDF company responsible for Hinkley and Sizewell are trying to back out of paying for them.
SMRs will typically cost in the range £2.1 million to £3 million per MW to build compared with the current estimate of £14.4 million per MW for Hinkley point C. Thorcon quotes £800 million per GW, i.e.£240 million for a 300 MW SMR. Rolls Royce leads the UK race for reasons good and bad and is offering SMRs here for rather more than Thorcon’s offer. Poland has already ordered 30 SMRs. Yet this government plans not to make any decision on the first SMR until 2029, presumably to avoid having to undertake the required value for money comparison between SMRs and Sizewell C. It claims to be a world leader but actually it will be last in the queue. “To recover the UK’s global leadership in civil nuclear” could be irony or could be evidence that some distant corner of HMT has a sense of humour after all.