Investment Subsidy for Sustainable Energy and Energy Saving (ISDE)

The ISDE (Investment Subsidy for Sustainable Energy and Energy Saving) is a national subsidy programme providing grants for energy efficiency and renewable energy measures in buildings, including insulation, heat pumps, solar thermal systems and heat network connections. The scheme operates through annual funding rounds and is planned to run until 2030. 

In 2022, the budget was increased by €62 million to €290 million due to high demand, with an additional €30 million allocated for small-scale wind and solar PV. 

More recent rounds continue with higher annual budgets, including around €600 million for households in 2025.

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