[Energy supplier details]
To [Add Details]
Account number: [Add details]
I write in connection with the above account.
Under the terms of the agreement that I have with you, FIT payment should have been made to me on [date] for the excess electricity I have generated between [date] and [date].
As of [today’s date] the payment is overdue by [number] days.
I have provided you with all [meter readings/ information] that I am required to supply under the terms of the agreement.
Accordingly, I would request that payment is made to me without further delay.
I look forward to hearing from you.