Exhibit 5.1

BARNES & THORNBURG LLP	11 South Meridian Street
	Indianapolis, IN 46204-3535 U.S.A.
	(317) 236-1313
	Fax (317) 231-7433
	www.btlaw.com

October 13, 2006

Vectren Utility Holdings, Inc.

Indiana Gas Company, Inc.

Southern Indiana Gas and Electric Company

One Vectren Square

Evansville, IN 47708

Ladies and Gentlemen:

You have requested our opinion in connection with the Registration Statement on Form S-3, as amended (the “Registration Statement”) of Vectren Utility Holdings, Inc. (“VUHI”) and Indiana Gas Company, Inc. (“Indiana Gas”) and Southern Indiana Gas and Electric Company (each an “Indiana Guarantor”) and Vectren Energy Delivery of Ohio, Inc. (the “Ohio Guarantor” and, together with the Indiana Guarantors, the “Guarantors”), filed pursuant to the Securities Act of 1933, as amended (the “Securities Act”), relating to the offer and sale by VUHI of $100,000,000 5.95% Insured Quarterly Notes due October 1, 2036 (the “Debt Securities”) and related joint and several guarantees by the Guarantors of the Debt Securities (the “Guarantees”) to be issued and sold under the provisions of the Indenture dated October 19, 2001, between VUHI and the Guarantors and U.S. Bank Trust National Association, as Trustee (the “Indenture”), the Prospectus Supplement dated October 13, 2006 relating to the Registration Statement (the “Prospectus Supplement”), the Underwriting Agreement, dated October 13, 2006 among VUHI and the Guarantors and Edward D. Jones & Co., L.P. (the “Underwriting Agreement”) and the related Terms Agreement dated October 13, 2006 (the “Terms Agreement”). We have examined such records, certificates and other documents and have made such investigation of law as we have deemed necessary in the circumstances.

Based on that examination and investigation, it is our opinion that:

1. When (a) the Debt Securities and the Guarantees shall have been duly executed, authenticated and delivered in accordance with the Indenture, Prospectus, Prospectus Supplement, Underwriting Agreement, and Terms Agreement and delivered against payment therefore and (b) applicable state blue sky laws have been complied with in connection with the offer and sale of the Debt Securities, the Debt Securities will be legal,

valid and binding obligations of VUHI and the Guarantees by the Indiana Guarantors will be legal valid and binding obligations of the respective Indiana Guarantors enforceable against each of them in accordance with their respective terms subject to (i) the United States Bankruptcy Code, insolvency, fraudulent conveyance, reorganization, moratorium and other similar laws now or hereafter in effect relating to or affecting creditors’ rights or remedies generally and (ii) general equitable principles (regardless of whether such enforcement is considered in a proceeding at law or in equity) and to judicial discretion.

This opinion letter is limited to the current federal laws of the United States and the current internal laws of the State of Indiana (without giving effect to any conflict of law principles thereof) and we have not considered, and express no opinion on, the laws of any other jurisdiction.

We consent to the use of our name under the caption “Legal Matters” in the Prospectus Supplement and to the filing of this opinion as Exhibit 5.1 to the Form 8-K of Vectren Utility Holdings, Inc. filed with the Securities and Exchange Commission on the date hereof.

Very truly yours,

/s/ Barnes & Thornburg LLP

Barnes & Thornburg LLP