Southern Co.

(SO) - Get Report

received a subpoena Tuesday to provide information to a federal grand jury in San Francisco regarding its role in the California energy crisis.

The Atlanta-based utility concern, which serves more than 4 million customers nationwide, said the subpoena covers a broad range of topics including the details regarding electrical production and sales in California. Southern's subsidiary

Mirant

(MIR)

was involved in energy marketing and trading in the California region during the time frame in question. Mirant was spun off by Southern in April 2001.

Southern is the latest company to be summoned to court regarding the power shortage that took place in 2000 and 2001, joining the likes of

Duke Energy

(DUK) - Get Report

,

Dynegy

(DYN)

,

Reliant Resources

(RRI)

and a slew of other companies.

Southern's shares were down $1.71, or 6.2%, at $25.79 on the news. The stock is down more than 17% since hitting an all-time high of $31.14 on October 28. Meanwhile, Mirant was trading up a nickel at $1.96.