(1) The principal purpose of this Act is to promote green energy.
(2) In this Act “ green energy ” means—
(a) the generation of electricity or heat from renewable or low-carbon sources by the use of any equipment, the capacity of which to generate electricity or heat does not exceed the capacity specified in subsection (3); and
(b) energy efficiency measures.
(3) That capacity is—
(a) in relation to the generation of electricity, 5 megawatts;
(b) in relation to the generation of heat, 5 megawatts thermal.
(4) In carrying out any function under this Act, the Secretary of State must have regard to—
(a) the principal purpose set out in subsection (1);
(b) the desirability of alleviating fuel poverty; and
(c) the desirability of securing a diverse and viable long-term energy supply.