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4
Report of Independent Registered Public Accounting Firm
To the Board of Directors and Shareholder of Michigan Consolidated Gas Company
In our opinion, the accompanying consolidated statements of financial position and the related consolidated statements of
operations, of cash flows and of changes in shareholder's equity and comprehensive income present fairly, in all material
respects, the financial position of Michigan Consolidated Gas Company and its subsidiaries at December 31, 2011 and 2010,
and the results of their operations and their cash flows for each of the three years in the period ended December 31, 2011 in
conformity with accounting principles generally accepted in the United States of America. These financial statements are the
responsibility of the Company's management. Our responsibility is to express an opinion on these financial statements based
on our audits. We conducted our audits of these statements in accordance with the standards of the Public Company
Accounting Oversight Board (United States). Those standards require that we plan and perform the audit to obtain reasonable
assurance about whether the financial statements are free of material misstatement. An audit includes examining, on a test
basis, evidence supporting the amounts and disclosures in the financial statements, assessing the accounting principles used and
significant estimates made by management, and evaluating the overall financial statement presentation. We believe that our
audits provide a reasonable basis for our opinion.
/s/PricewaterhouseCoopers LLP
Detroit, Michigan
March 19, 2012