Power provider says new mandate will cost $5B more at sites previously deemed low risk; legislators also move to classify them as high-risk.

General Electric Co. is betting that its next-gen offshore wind turbine—a giant at 12 MW, 260 meters high and with 107-m blades—will make offshore wind power more competitive and position the firm to win a fair share of the burgeoning energy market.

Supreme Court justices will weigh lower court rulings in a Hawaii-based dispute over treated sewage carried to the ocean through groundwater.