Solar installers from Baker Electric place solar panels on the roof of a residential home in Scripps Ranch, San Diego, California, U.S. October 14, 2016.
Solar installers from Baker Electric place solar panels on the roof of a residential home in Scripps Ranch, San Diego, California, U.S. October 14, 2016. Reuters / Mike Blake

The rate of development of U.S. clean energy projects including wind and solar power fell in the second quarter this year as inaction by Congress, trade issues and delays related to COVID-19 stifled activity, an industry group report said on Tuesday.

The industry saw a decline of 55% in U.S. project installations in April through June, compared to the same period in 2021, according to the report by American Clean Power. The quarter was the lowest for clean energy capacity additions since the third quarter of 2019, it said.

Congress has failed to pass President Joe Biden's climate legislation containing hundreds of billions of dollars in tax credits for clean power after Senator Joe Manchin, a conservative Democrat from coal-producing West Virginia, closed the door on the bill.

"We have been warning about the storm of policy and economic headwinds the clean power industry is facing, and this is a step in the wrong direction," ACP chief Heather Zichal said. "Congressional inaction and uncertainty on long-term tax policy, tariff and trade restrictions, and transmission constraints all impact the demand for clean energy at a time when we need to be rapidly scaling up development."

A U.S. Commerce Department probe into whether imports of solar panels from Southeast Asian countries are circumventing tariffs on goods made in China has thrown the solar industry into disarray. In June, the Biden administration said it would waive tariffs for two years on solar panels from four Southeast Asian countries in an attempt to revitalize solar installations.

The climate bill collapse is a blow to nascent efforts to wean the solar industry off major reliance on China, said the head of the largest U.S. solar panel producer First Solar Inc. U.S. solar installations were down 53% in the quarter, ACP said.

Onshore wind power installations fell 78% due to supply chain induced slow-downs and delays in power grid interconnections, ACP said.

Since the end of 2021, more than 32.4 gigawatts of clean power projects have been delayed, enough energy to power 6.5 million homes and support 110,000 jobs, ACP said.

Energy storage, such as large batteries that support use of solar and wind power, was the only technology to experience growth, with a 13% increase in installations, it said.