ATLANTIC CITY, New Jersey (Reuters) - U.S. offshore wind developers put on a brave face at a conference this week, touting their ability to work with leaders from both political parties, although privately attendees fretted that things could get rough for them if Republican Donald Trump wins the Nov. 5 presidential election.

The Republican nominee and former president has vowed to scrap offshore wind projects through an executive order on his first day in office if he retakes the White House, claiming windmills ruin the environment and kill birds and whales.

Trump is in a tight race against Democratic Vice President Kamala Harris, who has championed ambitious offshore wind targets as part of President Joe Biden's administration.

The tight election race has made a challenging year worse for the industry, already roiled by canceled projects, shelved lease sales and a construction accident at the country's first major offshore wind project.

"We have this conference in October every year and obviously a week before a federal election, that adds a certain amount of energy and uncertainty," American Clean Power Association CEO Jason Grumet said on the sidelines of ACP's Offshore Windpower conference in Atlantic City.

"The fact that this election is so polarized across the country I think increases the sense of uncertainty, not just around the economic questions about the deployment of offshore wind, but people are generally quite passionate about the direction of the country. So I think we felt just a bit of anxiety that was much broader than anybody's commercial commitments."

Speaking on background, at least a dozen industry participants at the conference spoke of an uncertain future for the industry under a Trump administration. Two executives in offshore wind development expressed fears of a long, slow spiral for the industry if Trump wins and halts federal permitting for projects.

All of them declined to comment on the record. Other executives and regulators Reuters approached at the conference either declined to comment on the implications of a Trump presidency or said they will work with whoever is in the White House, without detailing how.

"Our goal persists no matter who is in the White House," New York State Research and Development Authority CEO Doreen Harris said. New York wants to install 9 Gigawatts (GW) of offshore wind energy by 2035.

In an emailed statement, Equinor ( EQNR ) said it does not view providing renewable energy and creating a domestic supply chain as a partisan issue.

Separately, a White House advisor on renewable energy said a Trump presidency would likely mean a reduction in federal offshore wind leasing, adding to other challenges.

"I'm not sure that just the administration is going to be the only impediment. But clearly it'll be a major impediment if someone's not behind those projects," Carl Fleming, a partner at law firm McDermott Will & Emery, told Reuters by phone.

He added the offshore wind industry would struggle to meet the Biden administration's target of 30 GW by 2030, regardless of who wins the Nov. 5 election.

"The industry has hit some challenges and bumps along the way, but our role is to continue to try and bring that ambition and demonstrate that the U.S. is serious about the clean energy transition," Liz Klein, director of the U.S. Bureau of Ocean Energy Management, said when asked if the targets are achievable.

The conference overlapped with the Biden administration's first offshore wind lease sale in the Gulf of Maine, which drew just $22 million in bids. Several industry watchers blamed election jitters for low auction turnout by developers.

(Additional reporting by Nichola Groom; Editing by David Gregorio)