On Target #273
Thanks to Martin Spring for this edition of his letter which may be of interest to subscribers. Here is a section on battery back-ups:
The key inefficiency is intermittency. When winds don’t blow and the sun doesn’t shine, electricity has to be found elsewhere. In July there was so little wind driving the turbines on which Britain depends for a quarter of its power supplies that they operated at less than 5 per cent of their capacity for 314 hours. We’re told that we’ll eventually have battery farms on such a scale storing back-up energy to overcome the intermittency problem with the renewables that will replace fossil fuels. But the figures don’t add up. A friend who has analyzed them tells me that, using reasonable assumptions, to replace the 1,400 Terawatthours of electricity used in the European Union each year and currently coming mainly from natural gas and coal will require battery storage back-up of some 273 million tonnes of batteries. Assuming battery prices continue to fall, that will nevertheless cost say $8.2 trillion – double that taking into account necessary peripherals -- and need about 25 years’ mining of lithium carbonate. And you’d need to replace the entire stack of batteries every few years as their charge holding capacity erodes. As my friend says: These are “insanely prohibitive costs.” Activists argue that the current energy crisis must be used to intensify the transition to renewables. That is, more of one of the root causes of the crisis. More inefficiency, more malinvestment and more demand for relatively scarce materials such as copper.
