True enough, & currently you could connect a Briggs & Stratton methane powered 8kW generator to your mains gas supply & use it to sell power to the grid at around £1 per kWh, so that’s not going to last long either.
[based on fixed price mains gas at around 2.9p/kWh, a highly efficient Briggs & Stratton 8kW generator, & an outrageous export tariff of £1 kWh at the current peaks]
One problem currently with this enormous peak in electricity prices is that it’s being driven partly by a shortage of supply, but more by the actions of speculators who have come from the hopeless oil markets that they mercilessly exploited in the past.