A powerful committee in the US House of Representatives has adopted an amendment that effectively bars installation of wind turbines within 24 nautical miles (44.4km) of Maryland’s coast, posing an unexpected potential hurdle for two projects approved for subsidy support by state regulators.

In May, Maryland’s Public Service Commission awarded offshore renewable energy credits (ORECs) worth $131.93/MWh over 20 years for the initial 248MW phase of a planned 750MW project under development by Baltimore-based US Wind, a unit of Italy’s Toto Holding.