Royal Decree661/2007 [96], enacted on May 25, which regulates
electrical energy production activity in the special regime, devel-
ops Law No. 54/1997 of the Electricity Sector and establishes a
legal and economic regime for cogeneration energy-generating
facilities and those that use renewable energy and waste as
feedstock, with the fundamental objective of establishing a stable
and predictable system that guarantees adequate profitability for
electrical energy production in the special regime.