Edgar C. Mariano

Semirara Mining and Power Corporation, formerly Semirara Mining Corporation, is engaged in exploration, development and mining of coal resources in Semirara Island. The Company operates in the coal and power segments. Its subsidiaries include SEM-Calaca Power Corporation, which is engaged in the business of power generation; SEM-Cal Industrial Park Developers Inc., which is engaged in the development of economic zone; Southwest Luzon Power Generation Corporation, which is engaged in the business of power generation; Semirara Claystone Inc., which is engaged in the business of manufacturing of clay products; Semirara Energy Utilities Inc., which is involved in performing third-party functions as an alternative electric service provider authorized to serve remote and unviable areas; SEM-Balayan Power Generation Corporation, which is engaged in the business of power generation, and St. Raphael Power Generation Corporation, which is also engaged in the business of power generation.