For 2026 the SEAI solar PV grant is up to €1,800. It's worked out as €700 per kWp for the first 2 kWp, plus €200 per kWp from 2 to 4 kWp, so it reaches the €1,800 maximum at 4 kWp. Most domestic systems are 4 kWp or larger and get the full amount; a 3 kWp system gets €1,600 (2 × €700 + 1 × €200). Older quotes or articles citing €2,100 or €2,400 are out of date.
The 2027 level is expected to change, but nothing is confirmed until Budget 2027 on 6 October 2026. The rate that applies to you is the one in your grant offer from SEAI, and you then have 8 months from the offer to finish the work. So if you're ready, apply and get your offer, then plan the install and paperwork inside those 8 months.
To get it you need an SEAI-registered installer, a home built and occupied before 2021, the grant offer before any work starts, and a post-works BER assessment. Many installers quote with the grant already taken off, so check which basis a quote uses before you compare it with another. The grant stacks with the 0% VAT on domestic solar, so the two savings combine. A separate €600 battery grant is expected in the Budget but isn't confirmed, and its rules aren't published yet.