Rather than setting it up as a bill payment can you set it up as a regular standing order with whatever account details and reference (often the account number) that Electric Ireland advise? It may be that some or all banks automatically class bill payments as variable and so direct debits rather than fixed amount standing orders?
Or maybe you could just pay it manually each billing period by EFT:
Find out the many ways you can pay your Electric Ireland business electricity or gas bill here.
But you may lose any discounts tied to paying by DD/SO and you'll have to remember to pay it!