Interpretasi mahkamah konstitusi terhadap unsur efisiensi berkeadilan dalam Pasal 33 Ayat (4) undang-undang dasar 1945 (studi perkara mahkamah konstitusi Nomor 001-021- 022/PUU-I/2003 dan Nomor 149/PUU-VII/2009 tentang pengujian terhadap undang-undang ketenagalistrikan) = Interpretation of the constitutional court regarding the elements of equitable efficiency In article 33 paragraph (4) of the constitution of 1945 (case study on constitutional court decision Number 001-021- 022/PUU-I/2003 and Number 149/PUU-VII/2009 on the judicial review of the electricity law)