The exit fee would be applied to the gas account, yes. It could be waived if you were moving due to circumstances beyond your control though (e.g. COVID-19) and had not been aware at the time of switching that you would have to move mid contract.
We recommend noting your closing meter-reading(s) on your last day at your present address (but not closing the account just yet) then contacting Electric Ireland Sales on 1850 30 50 90 with the first day's meter-readings and the MPRN when you move address, to carry out the electricity account transfer and discuss the exit fee.
Sales are open until 8pm Monday to Friday, and until 5.30pm on Saturdays. They are closed on public holidays.