ABOITIZ POWER RENEWABLES, INC./TIWI CONSOLIDATED UNION (APRI-TCU) ON BEHALF OF FE R. RUBIO, MA. VICTORIA A. BELMES, ELEANORE D. DALDE, RICARDO B. COMPETENTE, AND VICENTE A. MIRANDILLA; APRI-TIWI EMPLOYEES LABOR UNION (APRI-TIELU) ON BEHALF OF VIRGILIO G. MACINAS, ROY D. DACULLO, ARNEL C. REPOTENTE, AND JAIME B. SARILLA; AND APRI-TIWI GEOTHERMAL POWER PLANT PROFESSIONAL/TECHNICAL EMPLOYEES UNION-DIALOGWU (APRI-TGPPPTEU-D) ON BEHALF OF VENER I. DELA ROSA, ARVID G. MUNI, ALVIN Y. SALONGA, ALVIN M. ENGUERO, MA. BLANCA I. FALCON, AND SALVE V. LIZARDO, PETITIONERS, VS. ABOITIZ POWER RENEWABLES, INC., MICHAEL B. PIERCE, ATTY. MARTIN JOHN YASAY, JUAN FELIPE ALFONSO, ARNEL SUMAGUI, WILFREDO G. SARMAGO, AND ROBERTO L. URBANO, RESPONDENTS