Renesas Electronics Corp., said all three plants, its Naka, Takasaki, and Yonezawa factories, are near the quake zone, which was centered off the Pacific coast from the city of Sendai. The 7.4-magnitude quake rattled cities as far away as Tokyo when it struck shortly after 11:30 PM on Wednesday.

Any long-term interruption at Renesas output could broadside a global automotive industry already reeling from a worldwide semiconductor shortage that has hammered production and sales. All three of the affected plants produce chips used in the automotive sector.

The quake hit in the same area as the epicenter of the massive 9.0-magnitude earthquake-tsunami catastrophe that rocked the country almost exactly 11 years ago, on March 11, 2011. That quake killed more than 19,000 people and took Renesas’ Naka plant offline for months.

In the latest natural disaster, Renesas said Thursday that electricity has been restored to the two plants that lost power overnight. The company is currently assessing the impact on equipment and products, as well as the safety of the facilities and the condition of clean rooms.

Renesas said it could not say when production might resume at the Naka and Takasaki factories. The company said it had partially resumed production of some test lines at its Yonezawa plant.

The Naka and Yonezawa plants make microcontrollers for automotive and industrial use. The Takasaki plant makes so-called PMOS chips used in converting AC-DC electrical currents.

The plants shut down automatically when power was disrupted overnight. Even if there is no damage, it will take several days to completely restart the facilities, a Renesas said.

The overnight earthquake killed three people and injured 170, Japanese public broadcaster NHK reported. It triggered a small tsunami and even derailed Japan’s famed bullet train. Blackouts hit the power grid as far away as Tokyo, where buildings shook and trains were halted.