San Onofre Nuclear Generating Station\u2019s unit 2 won\u2019t be starting until the Nuclear Regulatory Commission understands the \u201croot causes\u201d of the steam generator problems that caused it to shut down. Unit 3 is expected to be closed for some \u201cunspecific\u201d time, commission chair Allison Macfarlane told the Senate Committee on Environment & Public Works Sept. 12. \u201cThat\u2019s music to the ears of the people of California,\u201d Sen. Barbara Boxer (D-CA), committee chair, responded. Promise \u201cyou will not restart\u201d San Onofre \u201cuntil it\u2019s safe,\u201d she added. The time line of any San Onofre unit\u2019s restart is mired in the novelty of the problem--with extreme wear on nearly new steam generators in both units. \u201cIt\u2019s a very complex problem. One we\u2019ve not seen before,\u201d commissioner Bill Ostendorff said. He added that review of any restart after San Onofre\u2019s operator, Southern California Edison applies for it, \u201crequires technical staff evaluation.\u201d The steam generators, at a cost of $670 million, were installed circa 2010. Both Edison, and minority owner San Diego Gas & Electric, shoulder that investment responsibility. The California Public Utilities Commission is set to take up whether the facility\u2019s investment should remain in ratebase beginning in November. \u201cWhat a shame that the money was invested in what\u2019s so wrong with the plant,\u201d Boxer said. \u201cIt could have been stopped\u201d if federal regulatory staff \u201ctook a look\u201d at the plant, she added.