Royal Decree842/2002 [95], enacted on August 2, approves the
electrotechnical regulations for low voltage and their complemen-
tary technical instructions (CTI) BT 01 to BT 51, which are applied
to all renewable energy generation installations connected to low
voltages. Due to its status as a mineral energy resource, geother-
mal resource utilisation receives a regulatory framework from
mining legislation, specifically the law of Mines 22/1973 enacted
on July 21 (as amended by Law 54/1980 on November 5).
The authorisation of high-enthalpy geothermal applications (elec-
tricity generation and/or direct use) is governed by the conces-
sional resources regime of “section D” established in the mining
legislation. In this case, the responsibility for legislative develop-
ment and the implementation of the State's basic laws in the
mining regime fall to the autonomous communities.