Luminant Energy Trading California POS AM Prospectus update (post-effective amendment)

Exhibit 23(b)

CONSENT OF INDEPENDENT REGISTERED PUBLIC ACCOUNTING FIRM

We consent to the incorporation by reference in this Post-Effective Amendment No. 1 to Registration Statement No. 333-157057 on Form S-1 of our report dated March 2, 2009, relating to the financial statements of Energy Future Competitive Holdings Company (which report expresses an unqualified opinion and includes an explanatory paragraph related to EFH Corp. completing its merger with Texas Energy Future Merger Sub Corp and becoming a subsidiary of Texas Energy Future Holdings Limited Partnership on October 10, 2007), appearing in the Annual Report on Form 10-K of Energy Future Competitive Holdings Company for the year ended December 31, 2008, and to the reference to us under the heading “Experts” in the Prospectus, which is part of such Registration Statement.

/s/ Deloitte & Touche LLP

Dallas, Texas

March 17, 2009