On March 29, the U.S. Securities and Exchange Commission (SEC) Chairman Elisse Walter responded to a February 21 letter from Rep. Ed Markey (D-MA) on the San Onofre nuclear plant in California. Rep. Markey asserted that plant operator Southern California Edison did not inform investors of faulty steam generator tubes. Chairman Walter said the Commission will examine the information provided. The San Onofre facility has been offline since January 2012.