Exhibit 23

Consent of Independent Registered Public Accounting Firm

The Board of Directors

MEMC Electronic Materials, Inc.:

We consent to the incorporation by reference in the registration statements (Nos. 33-96420, 333-19159, 333-43474, 333-83624, 333-83628, 333-100404, 333-122405, and 333-142818) on Form S-8 of MEMC Electronic Materials, Inc. of our reports dated February 27, 2009, with respect to the consolidated balance sheets of MEMC Electronic Materials, Inc. and subsidiaries as of December 31, 2008 and 2007, and the related consolidated statements of income, stockholders’ equity, and cash flows for each of the years in the three-year period ended December 31, 2008, and the effectiveness of internal control over financial reporting as of December 31, 2008, which reports appear in the December 31, 2008 annual report on Form 10-K of MEMC Electronic Materials, Inc.

As discussed in Note 13 to the consolidated financial statements, the Company adopted Statement of Financial Accounting Standards (SFAS) No. 158, Employers’ Accounting for Defined Benefit Pension and Other Postretirement Plans, effective December 31, 2006, and the measurement date provisions as of December 31, 2008.

As discussed in Note 2 to the consolidated financial statements, the Company adopted Financial Accounting Standards Board Interpretation No. 48, Accounting for Uncertainty in Income Taxes, an interpretation of Statement of Financial Accounting Standard No. 109, effective January 1, 2007 and SFAS No. 157, Fair Value Measurements, as of January 1, 2008.

/s/ KPMG LLP

St. Louis, Missouri

February 27, 2009