By The Star StaffHouse Government Committee Chairman Víctor Parés Otero announced Monday the introduction of a measure requiring the Puerto Rico Energy Bureau (PREB) to establish the percentage of renewable energy that must be produced every five years to achieve the goal of completely eliminating fossil fuels by 2050.Under the legislation, starting in 2025, and for each subsequent five-year period, the PREB will submit a report to the Legislature detailing its determination regarding the requir