MIAMI — Miami-Dade County is upping its commitment to shore power at PortMiami, a technological upgrade that allows ships to plug into the local grid at port instead of continuing to burn fuel — and spew water and air pollution — in downtown Miami. Last year, Mayor Daniella Levine Cava committed the county to build oneshore power hookup at the Carnival terminal by fall 2023. Now, PortMiami Director Hydi Webb told the Miami Herald, those ambitions have expanded. The county is now aiming to build five shore power hookups at PortMiami that will allow three ships to be plugged in simultaneously. “…