In brief, for the 2024-2025 period, the "Grant Scheme for the Encouragement of the Use of RES" offers several categories. The General Category (A1) offers a grant of €375 per kW, capped at €1,500 (or roughly 4kW). If you live in a mountainous area, this amount increases by 50%.
There are also specialized categories. Category A2 (Vulnerable Households) offers a significantly higher grant of €1,250 per kW (max €6,250). The newer "Photovoltaics for All" (Category A3) allows households without initial capital to install a system; it provides a €250/kW grant plus a repayment scheme where the remaining cost (up to €1,000/kW) is paid back via bimonthly electricity bill charges of €150. Additionally, there is a €750 bonus if you combine solar installation with roof insulation.
For the detailed description check out our "Incentive schemes" section.