(Bloomberg) -- Sunrun Inc. is seeing a surge in US battery sales after California — the country's biggest solar market — slashed rooftop subsidies in a move intended to boost backup power when the sun begins to set in the evening. About 45% of the company's new US sales comprised both solar and storage in the fourth quarter, the company said in a statement Wednesday. That's up from 33% in the prior quarter and 15% at the beginning of last year. In California, about 85% of new sales featured solar and storage systems for the last two quarters of 2023, up from 20% before the state changed its rooftop incentive policy. California's move to do so last April left the sector reeling. It led to bankruptcies and job cuts. For Sunrun, installation growth slowed to 3% last year, far short of its full year outlook of 10-15% released in the fourth quarter of 2022. The company — America's biggest rooftop installer — sees 2024 solar installations down as much as 5%.