(Bloomberg) -- Fluence Energy Inc. has declared force majeure with three customers as China’s coronavirus lockdown disrupted battery supplies, forcing them to look elsewhere for alternative sources.

The US developer of large-scale energy storage projects aims to get 30% of its batteries from sources outside China by year end and half by the end of 2024, company executives said Thursday during an earnings call. That will include batteries made by Europe’s Northvolt AB, following an agreement between the two companies last year. Fluence hasn’t lost any customers due to force majeure, the executives said.

Shares of the Arlington, Virginia-based firm fell as much as 30% after the call. The stock was down 4.1% to $6.80 at 11:07 a.m. in New York.

China’s efforts to fight a resurgent coronavirus were just one of the headwinds facing Fluence and the energy storage industry, Chief Executive Officer Manuel Perez Dubuc said during the call. International shipping still takes far longer than before the pandemic, and a “higher than normal” number of components received from suppliers have been faulty.

Chief Financial Officer Dennis Fehr said projects that used to take 12 months to complete now take 15 to 18 months. The U.S. trade probe on imported solar cells also could affect 10% to 15% of the company’s project pipeline since Fluence supplies energy storage to many large-scale projects.

“We’ve had to reset our expectations,” Fehr said.

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