Feed-in tariff at cost is an instrument that was developed by the federal government for the purpose of promoting electricity production from renewable energy sources. One-off investment grants are since 2014 an instrument that has been developed by the Confederation for the purpose of encouraging electricity production in small photovoltaic systems. One-off grants cover a maximum of 30 percent of the investment costs of reference systems. The new model entered into effect on 1 January 2005 and replaced the originally planned cantonal "offset fund". According to the Federal Energy Act and Energy Ordinance, the cantons are responsible for enforcing the regulations concerning network connection of independent producers with the support of the Swiss Federal Office of Energy.