In article , Andy Burns
writes
Dave Liquorice wrote:

But the claim is "100% renewable energy". If more
renewable energy has been sold than there is actually available on
the grid at any given time (and your lights don't go out) then the
claim of "100% renewable energy" is false and misleading.

Sainsbury's actual claim for their 100% tariff only applies over time,
not at any given moment ...

"We'll match 100% of the electricity you use on this tariff with the
purchase of Renewable Energy Guarantee of Origin (REGOs)."

"although its not possible to know whether the electricity that ends
up in your home is from a renewable source €“ we can guarantee that
every unit you use will be replaced on the network by a unit of
renewably sourced electricity. Beyond this, there are currently no
additional environmental benefits to this tariff."
That's fair enough. No quibble with that.
--
bert