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My energy supplier (all electric) said "we think you will use x amount in the coming months therefore we recommend a DD of x£££s" which was more than double the DD I was paying.
So I rang them and said I was more than capable of regulating my own power usage ( the website monitoring is very good via the smart meter) and yeah thanks for your concern but I'm not paying that. We agreed on an increased DD (winter months) but no where near their 'estimate'.tl:dr - they try it on and they know it - challenge.
That was kind of my point. They have this technology that basically means they can stop guessing how much of their product you consume, so what do they do with it? Fuck knows because the obvious answer of "improve the customer experience" doesn't seem to have dawned on them yet.
Also - holding credit balances is not hard if the supplier only sends you quarterly statements and then caveats the balance such that you think you'll burn through it in the next quarter. It's all bollocks and they don't pay interest. It's free financing for them.
I should switch to @amey 's provider so I can just stick all my savings with them as massive over payments. 3% is not bad.