It seems like you might have to find out how other folks in Ireland have been able to get connected to the grid.
I looked around, but couldn't find much new info.. This looks like old regs..
Solar Panel Planning Permission - Regulations
Problems with some of the regs in some areas of the USA, they didn't keep up
with new technology, so the Enphase type of inverter, which means that 230 AC
comes right off your roof, seems illegal to a lot of city inspectors.
If the price of kW hours stays reasonable, I will likely live out the rest of my life without using a grid tie system.