Five US east coast governors sent a letter to the Trump administration expressing concern that permitting delays for Vineyard Wind, the nation’s first major offshore wind project, will undermine efforts to promote regulatory certainty for the emerging sector.

“Like other industries, it is critical that states and the federal government establish and maintain clear regulatory timelines so as to incentivise the necessary capital investment,” they wrote in the letter to commerce secretary Wilbur Ross and interior secretary David Bernhardt.