Hi @Max12BL ,
In all cases WHD is applied all in one go. How it gets delivered though, depends on how you pay.
For ALL Pay Monthly customers: The WHD just gets applied as an account credit
For SMART Pay As You Go: The WHD is automatically sent to the electric meter by default as a Remote Token Issue - unlike Discretionary Credit you won’t have to pay this back and it WON’T be applied as a debt either
For TRADITIONAL Pay As You Go: You’ll get a voucher code to take to the shop. You can use that to top-up the key/card without needing to hand any cash over - but you can also throw some cash onto the key/card in the same transaction if you want to. Using the code triggers a Remote Token Issue to be applied to the key, which in turn credits the meter with the WHD credit.
The key/card will accept the RTI regardless of how much credit is already stored on it. The meter might not suck the balance off of the key/card if it’d go over the meter balance limit though so you may need to drain the meter a bit first. We (as the forum volunteers here) recommend you drain the key/card to zero by transferring all credit to the meter before redeeming the voucher though, just to be safe!
The Warm Home Discount is £150, which will appear as a single credit on your account, with any luck this month. It might show as £142.86 + £7.14 VAT, but either way, your bill for the month with be £150 lower than otherwise.