Duke Energy CORP — Capital/Financing Update 2013

Mar 11, 2013

| Filed under Rule 424(b)(3), Registration
Statement No. 333-169633 | | | | | | | | | | | | |
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| Pricing Supplement No. 6 - Dated Monday, March 11,
2013 (Prospectus Dated September 29, 2010 and Prospectus Supplement Dated November 13, 2012) | | | | | | | | | | | | |
| CUSIP Number | Principal Amount | Selling Price | Gross Concession | Net Proceeds | Coupon Type | Coupon Rate | Coupon Frequency | Maturity Date | 1st Coupon Date | 1st Coupon Amount | Survivor’s Option | Product Ranking |
| 26442KAF3 | [ ] | 100.000% | 2.300% | [ ] | Fixed | 3.350% | Quarterly | 03/15/2027 | 06/15/2013 | $7.82 | Yes | Senior Unsecured Notes |
| Redemption Information: Non-Callable | | | | | | | | | | | | |
| Duke Energy Corporation | | Trade Date: Monday, March 18, 2013 @ 12:00 PM ET | | | | | | | Duke Energy Corporation | | | |
| | | Settlement Date: Thursday, March 21, 2013 | | | | | | | Duke Energy InterNotes | | | |
| | | Minimum Denomination/Increments: $1,000.00/$1,000.00 | | | | | | | Due One Year or More from Date of Issue | | | |
| | | Initial trades settle flat and clear SDFS: DTC Book Entry only | | | | | | | Prospectus Supplement Dated November 13, 2012 | | | |
| | | DTC Number 0235 via RBC Dain Rauscher Inc. | | | | | | | to Prospectus Dated September 29, 2010 | | | |

Agents: BofA Merrill Lynch, Merrill Lynch, Pierce, Fenner & Smith Incorporated, Incapital, LLC, Citigroup, Edward D. Jones & Co., L.P., Morgan Stanley, RBC Capital Markets, LLC, UBS Investment Bank, Wells Fargo Advisors, LLC

If the maturity date or an interest payment date for any note is not a business day (as such term is defined in the Prospectus Supplement), principal, premium, if any, and interest for that note is paid on the next business day, and no interest will accrue from, and after, the maturity date or interest payment date.

Investors should read this pricing supplement in conjunction with the Prospectus and Prospectus Supplement.

InterNotes® is a registered trademark of Incapital Holdings LLC. All Rights Reserved.