John Tomblin (16th Nov) speaking of solar and wind, disingenuously claims that ‘the National Grid has successfully integrated their intermittent supply of electricity into the grid.’

Technically he is correct, but their integration has only been successful because the grid still has a large baseline of reliable and non-intermittent gas, coal and nuclear supply.

It is obvious that wind and solar cannot supply 100% our electricity requirements without such backup.

And Richard Stanley Green (17th Nov) must not be allowed to get away with the statement that ‘electricity from offshore wind turbines is now cheaper than coal, gas and nuclear.’

If that were true, then offshore wind would not require subsidies; I advise him to investigate just how large a proportion of his electricity bill is diverted to prop up renewables.

Tony Fisher

Roman Road, Weymouth