RODANTHE, N.C. — Early last year, a house crumbled into the sea in this small Outer Banks community, home to some of the most rapid rates of erosion and sea level rise on the East Coast.

Germany’s RWE is partnering with offshore PV specialist SolarDuck to build a 0.5 MW floating solar plant near an offshore wind farm in the North Sea. German utility RWE and Dutch offshore PV ...