Yesterday I received a six monthly bill from my supplier, one of the big six, (or however many there are these days).
"Your personal projection for the next 12 months - £507"
Today I received an annual electricity summary from the same firm.
"Your personal projection for the next 12 months - £231"
Same tariff, same everything. This is the electricity company being more transparent, at the Government's request.
Basically - clear as mud!