What happened?

On the evening of Saturday, July 13, Vineyard Wind received an alert that there was a problem with one of its turbines. The equipment contains a “delicate sensoring system,” CEO Klaus Moeller told the Nantucket Select Board during a public meeting last week. Though he did not describe what the alert said, he added that “one of the blades was broken and folded over.” Later at the meeting, a spokesperson for GE Vernova, which manufactured and installed the turbines, said that “blade vibrations” had been detected. About a third of the blade, or roughly 120 feet, fell into the water.

Two days later, Vineyard Wind contacted the town manager in Nantucket to explain that modeling showed the potential for debris from the blade to travel toward the island. Sure enough, fiberglass shards and other scraps began washing up on shore the next day, and all beaches on the island’s south shore were quickly closed to the public.

On Thursday morning, another large portion of the damaged blade detached and fell into the ocean. Monitoring and recovery crews continued to find debris throughout the area over the weekend. The beaches have since reopened, but visitors have been advised to wear shoes and leave their pets at home as cleanup continues.

Why did the blade break?

During GE’s second quarter earnings call on July 24, GE Vernova CEO Scott Strazik and Vice President of Investor Relations Michael Lapides said the company had identified a “material deviation” as the cause of the accident, and that the company is continuing to work on a "root cause analysis" to get to the bottom of how said deviation happened in the first place.

The turbine was one of GE’s Haliade-X 13-megawatt turbines, which are manufactured in Gaspé, Canada, and it was still undergoing post-installation testing by GE when the failure occurred — that is, it was not among those sending power to the New England grid. This was actually the second issue the company has had at this particular turbine site. One of the original blades destined for the site was damaged during the installation process, and the one that broke last week was a replacement, Craig Gilvard, Vineyard Wind’s communications director, told the New Bedford Light.

How did Vineyard Wind respond?

By Vineyard Wind’s account at the meeting last week, the accident triggered an automatic shut down of the system and activated the company’s emergency response plan, which included immediately notifying the U.S. Coast Guard, the federal Bureau of Safety and Environmental Enforcement, and regional emergency response committees.

Moeller, the CEO, said during the meeting that the company worked with the Coast Guard to immediately establish a 500 meter “safety zone” around the turbine and to send out notices to mariners. According to the Coast Guard’s notice log, however, the safety zone went into effect three days later. In response to my questions, the Coast Guard confirmed that the zone was established around 8pm that night and announced to mariners over radio broadcast.

Two days after the turbine broke, on Monday, Vineyard Wind contacted the National Oceanic and Atmospheric Administration for aid in modeling where the turbine debris would travel in the water. The agency estimated pieces would likely make landfall in Nantucket that day. Vineyard Wind put out a press release about the accident and subsequently contacted the Nantucket town manager. At the Nantucket Select Board meeting last week, Moeller said the company followed regulatory protocols but that there was “really no excuse” for how long it took to inform the public, and said, “we want to move much quicker and make sure that we learn from this.”

The Interior Department’s Bureau of Safety and Environmental Enforcement has ordered the company to cease all power production and installation activities until it can determine whether this was an isolated incident or affects other turbines.

By Tuesday, Vineyard Wind said it had deployed two small teams to Nantucket in addition to hiring a local contractor to remove debris on the island. The company later said it would “increase its local team to more than 50 employees and contractors dedicated to beach clean-up and debris recovery efforts.”

GE Vernova is responsible for recovering offshore debris and has not published any public statements about the effort. In response to a list of questions, a GE Vernova spokesperson said, “We continue to work around the clock to enhance mitigation efforts in collaboration with Vineyard Wind and all relevant state, local and federal authorities. We are working with urgency to complete our root cause analysis of this event.”

Did anyone get hurt?

There have been no reported injuries as a result of the accident.

What are the risks now?

Vineyard Wind and GE Vernova have stressed that the debris are “not toxic.” At the Select Board meeting, GE’s executive fleet engineering director Renjith Viripullan said that the blade is made of fiberglass, foam, and balsa wood. It is bonded together using a “bond paste,” he said, and likened the blade construction to that of a boat. “That's the correlation we need to think about,” he said.

One of the board members asked if there was any risk of PFAS contamination as a result of the accident. Viripullan said he would need to “take that question back” and follow up with the answer later. (This was one of the questions I asked GE, but the company did not respond to it.)

That being said, the debris poses some dangers. Photos of cleanup crews posted to the Harbormaster’s Facebook page show workers wearing white hazmat suits. Vineyard Wind said “members of the public should avoid handling debris as the fiber-glass pieces can be sharp and lead to cuts if handled without proper gloves.”

Though members of the public raised concerns at the meeting and to the press that fiberglass fragments in the ocean threaten marine life and public health, it is not yet clear how serious the risks are, and several efforts are underway to further assess them. Vineyard Wind is developing a water quality testing plan for the island and setting up a process for people to file claims. GE hired a design and engineering firm to conduct an environmental assessment, which it will present at a Nantucket Select Board meeting later this week. The Massachusetts Department of Environmental Protection has requested information from the companies about the makeup of the debris to evaluate risks, and the Department of Fish and Game is monitoring for impacts to the local ecosystem.

How is the cleanup going?

As of last Wednesday morning, Vineyard Wind had collected “approximately 17 cubic yards of debris, enough to fill more than six truckloads, and several larger pieces that washed ashore.” It is not yet known what fraction of the turbine that fell off has been recovered. Vineyard Wind did not respond to a request for the latest numbers in time for publication, but I’ll update this piece if I get a response.

Has anything like this happened before?

Yes. In May, a blade on the same model of turbine, the GE Haliade-X, sustained damage at a wind farm being installed off the coast of England called Dogger Bank. At the Nantucket Select Board meeting, a spokesperson for GE said the Dogger Bank incident was “an installation issue specific to the installation of that blade” and that “we don’t think there’s a connection between that installation issue and what we saw here.” Executives emphasized this point during the earnings call and chalked up the Dogger Bank incident to “an installation error out at sea.”

Several blades have also broken off another GE turbine model dubbed the Cypress at wind farms in Germany and Sweden. After the most recent incident in Germany last October, the company used similar language, telling reporters that it was working to “determine the root cause.”

A “company source with knowledge of the investigations” into the various incidents recently told CNN that “there were different root causes for the damage, including transportation, handling, and manufacturing deviations.”

GE Vernova’s stock price fell nearly 10% last Wednesday.

How did locals react?

The backlash was swift. Nantucket residents immediately wrote to Nantucket’s Select Board to ask the town to stop the construction of any additional offshore wind turbines. “I know it's not oil, but it's sharp and maybe toxic in other ways,” Select Board member Dawn Holgate told company executives at the meeting last week. “We're also facing an exponential risk if this were to continue because many more windmills are planned to be built out there and there's been a lot of concern about that throughout the community.”

The Select Board plans to meet in private on Tuesday night to discuss “potential litigation by the town against Vineyard Wind relative to recovery costs.”

“We expect Vineyard Wind will be responsible for all costs and associated remediation efforts incurred by the town in response to the incident,” Elizabeth Gibson, the Nantucket town manager said during the meeting last week.

The Aquinnah Wampanoag tribe is also calling for a moratorium on offshore wind development and raised concerns about the presence of fiberglass fragments in the water.

On social media, anti-wind groups throughout the northeast took up the story as evidence that offshore wind is “not green, not clean.” Republican state representatives in Massachusetts cited the incident as a reason for opposing legislation to expedite clean energy permitting last week. Fox News sought comment from internet personality and founder of Barstool Sports David Portnoy, who owns a home on Nantucket and said the island had been “ruined by negligence.” The Texas Public Policy Foundation, a nonprofit funded by oil companies and which is backing a lawsuit against Vineyard Wind, cited the incident as evidence that the project is harming local fishermen. The First Circuit Court of Appeals is set to hear oral arguments on the case this Thursday.

Meanwhile, environmental groups supportive of offshore wind tried to do damage control for the industry. “Now we must all work to ensure that the failure of a single turbine blade does not adversely impact the emergence of offshore wind as a critical solution for reducing dependence on fossil fuels and addressing the climate crisis,” the Sierra Club’s senior advisor for offshore wind, Nancy Pyne, wrote in a statement. “Wind power is one of the safest forms of energy generation.”