The regulatory core of the Act comprises the statutory obligation to cover a percentage of heat demand from energy from renewable sources. The percentage involved depends on the type of energy used and ranges from 15% for solar energy to 50% for biofuel. However, the obligation to meet heat demand using renewables may be replaced by other measures, e.g., high-performance CHP plants.
 
 It is hoped that the share of renewables in heat supply will be increased from the current 6.6% to 14% in 2020. An annual EUR500m (USD 627.5m) in funding will be made available up to 2012 to promote energy efficiency in buildings.