Variable direct debit based on real usage- Why isn't this an option?

Being an Energy Retailer is hard. They typically pay for energy upfront based on their forecasted customer consumption, which does mean they’re often out of pocket before customers use and pay for the energy. Retailers who purchase energy to sell to customers, usually involves forecasting consumption and then purchasing & hedging energy based on this forecast upfront.

The risks/implications of this to Energy Retailers are

Cash Flow Implications:

Since customers typically pay for energy on a monthly basis after consumption (based on estimated or actual meter readings), there’s a gap between when retailers pay suppliers and when they recoup costs from customers.
This means retailers have to manage their cash flow carefully, as they bear the initial financial burden of securing (purchasing) energy.

Risk of Under-Recovery:

If customer usage is higher than forecasted (e.g., during an unexpectedly cold winter), retailers may need to buy additional energy at potentially higher market prices, impacting profitability.
Conversely, if they overestimate demand, they risk buying too much energy, leading to excess supply that may be sold back at a loss if wholesale prices fall.

Customer Payment Issues:

Retailers are also at risk if customers delay payments or default, adding to the challenge of managing cash flow.

So worth just highlighting that not all Energy Retailers will have ££££££ in the bank to earn interest on. They may actually be out of pocket actually waiting for customers to pay their Direct Debit.