With deadlines looming, public-sector projects at schools and an airport could be among the last in the city to receive Biden-era tax credits for renewable energy.By Daniel PerrinDuring the Biden administration, clean energy developers in the Philadelphia area planned to take advantage of new, expanded federal support for renewable projects for years. Now, as the Trump administration and congressional Republicans roll back many of those policies, sustainability work in the region is taking place on shifting terrain, requiring major players to reconfigure their plans around expiring tax credits and undermining those still to come.