Exhibit 23.3

CONSENT OF INDEPENDENT REGISTERED PUBLIC ACCOUNTING FIRM

We consent to the use in this Amendment No. 2 to Registration Statement No. 333-152823 of our report dated May 15, 2008, relating to the financial statements of Northern Utilities, Inc. (which report expresses an unqualified opinion and includes an explanatory paragraph relating to the adoption of FASB Statement No. 158, “Employers’ Accounting for Defined Benefit Pension and Other Postretirement Plans”), appearing in the Prospectus, which is a part of such Registration Statement, and to the reference to us under the heading “Experts” in such Prospectus.

/s/    DELOITTE & TOUCHE LLP

Columbus, Ohio

December 3, 2008