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Raphael Perpetuo " Popo'" Mercado Lotilla (born June 16, 1958) is a Filipino lawyer, businessman, and government official serving as the 33rd secretary of environment and natural resources ( ad interim, pending Commission on Appointments approval) since 2025, under President Bongbong Marcos. He previously served as the 7th and 13th secretary of energy under Presidents Gloria Macapagal Arroyo (2005–2007) and Bongbong Marcos (2022–2025), respectively.
Lotilla studied at the University of the Philippines Diliman, where he obtained his Bachelor of Science in Psychology (1980), Bachelor of Arts in History, and Bachelor of Laws (1984). He then attended the University of Michigan, where he obtained his Master of Laws in 1987.
Lotilla also served as a legal consultant at the Office of the Senate President, Senate Committee on Foreign Relations, and for some senators beginning in 1987. He was also named as the legal adviser of the National Economic and Development Authority in 1990.
Lotilla served as PSALM Chief Operating Officer. He served as president and chief executive officer of the Power Sector and Liabilities Management Corporation (PSALM).
He was Deputy Director-General (DDG) from 1996 to January 2004. He was the supervising official of the secretariat of the Legislative-Executive Development Advisory Council (LEDAC). As adviser of LEDAC, his key reform bill was the Electric Power Industry Reform Act of 2001 that privatized the power sector's entire supply chain.
Lotilla's first term as the secretary of energy was under President Gloria Macapagal Arroyo from 2005 to 2007. His second term began on July 11, 2022, under President Bongbong Marcos.
On May 22, 2025, President Marcos ordered members of his cabinet to tender their courtesy resginations in the aftermath of the May 12, 2025 midterm elections. He will be taking the role of Department of Environment and Natural Resources (DENR) secretary, replacing Toni Yulo-Loyzaga.
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