PremierNotes Website

Free Writing Prospectus

Filed Pursuant to Rule 433

Registration Number 333-173282

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$18.36 as of Apr 4 2011

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Change -0.06(-33%)

Volume 1.96m

Previous Close: $18.42

52 Week Low: $15.47

52 Week High: $18.60

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At last—a powerful opportunity for higher returns on your short-term funds

If you’re looking to get an attractive rate of return on your short term funds, you owe it to yourself to check out PremierNotesSM from Duke Energy. PremierNotes is designed to deliver a rate of return that is higher than the average taxable money market mutual fund—a minimum of 1/4 percent higher. And, with our tiered approach to returns, higher balances can benefit from rates that are even higher.

Introducing PremierNotesSM from Duke Energy

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MAKE YOUR CASH WORK HARDER FOR YOU

Attractive Returns

Easy Access To Your Money

No Maintenance Fees

Secure, Online Investment Access 24/7

Backed By the Strength and Stability of Duke Energy

Amount Rate Yield

Less than $10.000 1.30% 1.31%

$10.000 to $49.999 1.50% 1.51%

$50.000 to $250.000 1.70% 1.71%

Contact Us

800-659-DUKE or E-mail Us PremierNotesSM Resources

Benefits of Ownership

Duke Energy Employees & Retirees

Enrollment Form

PremierNotes FAQs

Prospectus

Financials/SEC Filings

PremierNotes Plan

Rates


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PremierNotesSM

Duke Energy PremierNotes earn interest at a floating rate per annum equal to the most recent seven-day average yield (non-compounded) for taxable money funds as reported weekly in the iMoneyNet Money Fund Average.™ plus at least 1/4 percent. Interest is compounded daily and posted to your investment monthly. Investors are encouraged to carefully read the program prospectus and seek professional advice from a financial advisor when considering participation in the PremierNotes program. Interest income is subject to federal and applicable state and local taxes. Overdraft and other fees may apply, as outlined in the program prospectus.

An investment in PremierNotes allows individuals and institutions to benefit from the financial strength of Duke Energy Corporation. PremierNotes are not money market accounts, which are typically diversified funds consisting of short-term debt securities of many issuers, and therefore do not meet the diversification and investment quality standards set forth for money market funds by the Investment Company Act of 1940. Instead, PremierNotes are variable denomination, floating rate demand notes that are unsecured debt obligation of Duke Energy Corporation and are backed only by the assets of Duke Energy Corporation. Your investment in PremierNotes is not equivalent to a deposit or other bank account and is not guaranteed, insured, or subject to the protection of the Federal Deposit Insurance Corporation.

Duke Energy Corporation has filed a registration statement (including a prospectus) with the United States Securities and Exchange Commission (the “SEC”) for the offering to which this communication relates. Before you invest, you should read the prospectus that is included in that registration statement, as well as the other documents that Duke Energy Corporation has filed with the SEC, for more complete information about Duke Energy Corporation and this offering. You may get these documents for free by visiting the SEC website at www.sec.gov or by downloading them from the Duke Energy PremierNotes website. Alternatively, Duke Energy Corporation will arrange to send you a prospectus if you request it by calling toll free at 800-659-DUKE (3853).

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No investment fees/easy access to your money

Getting attractive returns doesn’t mean giving up convenience, or having to deal with a lot of automatic fees In fact, as long as you maintain your minimum balance, there are no recurring sales fees, maintenance fees or investment fees, with PremierNotesSM, all of your money is working for you. The minimum balance is only $1,000, and you can make fast, free and easy redemptions by check or by phone. You get unlimited check writing over $250, and all your checks are on us— just let us know when you’re running low, and we’ll send you another packet free. You can even link your PremierNotesSM investment to your bank account to ensure quick transfers

24/7 account access and free investment tools

Once you’re enrolled, you’ll be able to set up your own secure PremierNotesSM online portal to access your investment information any time of the day or night. You’ll be able to confirm transactions and view up to 18 months of investment activity You II also be able to view our current investment rates

PremierNotesSM Sign In Investments

Current Rates

Amount Rate Yield

Less than $10,000 1.30% 1.31%

$10,000 to $49,999 1.50% 1.51%

$50,000 to $250.000 1.70% 1.71%

Contact Us

800-659-DUKE or E-mail Us PremierNotesSM Resources

Benefits of Ownership

Duke Energy Employees & Retirees

Enrollment Form

PremierNotes FAQs

Prospectus

Financials / SEC Filings

PremierNotes Plan

Rates

www.duke-energy.com/investors/individual-investors/premiernotes-benefits.asp (page 2)


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PremierNotes ™

Duke Energy PremierNotes earn interest at a floating rate per annum equal to the most recent seven-day average yield (non-compounded) for taxable money funds as reported weekly in the iMoneyNet Money Fund Average,™ plus at least 1/4 percent. Interest is compounded daily and posted to your investment monthly. Investors are encouraged to carefully read the program prospectus and seek professional advice from a financial advisor when considering participation in the PremierNotes program. Interest income is subject to federal and applicable state and local taxes. Overdraft and other fees may apply, as outlined in the program prospectus.

An investment in PremierNotes allows individuals and institutions to benefit from the financial strength of Duke Energy Corporation. PremierNotes are not money market accounts, which are typically diversified funds consisting of short-term debt securities of many issuers, and therefore do not meet the diversification and investment quality standards set forth for money market funds by the Investment Company Act of 1940. Instead, PremierNotes are variable denomination, floating rate demand notes that are unsecured debt obligation of Duke Energy Corporation and are backed only by the assets of Duke Energy Corporation. Your investment in PremierNotes is not equivalent to a deposit or other bank account and is not guaranteed, insured, or subject to the protection of the Federal Deposit Insurance Corporation.

Duke Energy Corporation has filed a registration statement (including a prospectus) with the United States Securities and Exchange Commission (the “SEC”) for the offering to which this communication relates. Before you invest, you should read the prospectus that is included in that registration statement, as well as the other documents that Duke Energy Corporation has filed with the SEC, for more complete information about Duke Energy Corporation and this offering. You may get these documents for free by visiting the SEC website at www.sec.gov or by downloading them from the Duke Energy PremierNotes website. Alternatively, Duke Energy Corporation will arrange to send you a prospectus if you request it by calling toll free at 800-659-DUKE (3853).

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Benefits of Ownership Duke Energy Employees & Retirees PremierNotes FAQs Rates

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Rates

PremierNotesSM investments pay a competitive floating rate of interest that is determined at the direction of the Duke Energy PremierNotes Committee on a weekly basis, with rates effective each Monday. Rates will always be at least 1/4 percent greater than the average rate of taxable U.S. money-market mutual funds, as published weekly in Money Fund Report®, a service of iMoneyNet. Inc.

Yield reflects the annual rate of return on your investment. It assumes that interest is accrued daily and posted monthly and that there are no additional investments or redemptions.

An investment as strong as Duke Energy

Your PremierNotes investment is backed by the strength and stability of Duke Energy Corporation, a Fortune 500 company traded on the New York Stock Exchange. With a proud history of more than 100 years of service. Duke Energy is today one of the largest electric power holding companies in the United States, serving approximately four million residential and business customers. Duke Energy has paid a cash dividend on its common stock since 1926 and has posted a long history of consistent earnings Through PremierNotes, you can benefit from this proven, long term financial strength and stability, while earning a higher return on your short-term investments

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Investments

Current Rates

Amount Rate Yield

Less than $10.000 1.30% 1.31%

$10,000 to $49,999 1.50% 1.51%

$50,000 to $250,000 1.70% 1.71%

Contact Us

800-659-DUKE or E-mail Us

PremierNotesSM Resources

Benefits of Ownership

Duke Energy Employees & Retirees

Enrollment Form

PremierNotes FAQs

Prospectus

Financials / SEC Filings

PremierNotes Plan

Rates


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PremierNotes™

Duke Energy PremierNotes earn interest at a floating rate per annum equal to the most recent seven-da/ average yield (non-ccmpourded) for taxable money funds as reported weekly in the iMoneyNet Money Fund Average.™ plus at least V4 percent. Interest is compounded daily and posted to your investment monthly. Investors are encouraged to carefully read the program prospectus and seek professional advice from a financial advisorwhen considering participation in the PremierNotes program. Interest income is subject to federal and applicable state and local taxes. Overdraft and other fees may apply, as outlined in the program prospectus.

An investment in PremierNotes allows individuals and institutions to benefit from the financial strength of Duke Energy Corporation. PremierNotes are not money market accounts, which are typically diversified funds consisting of short-term debt securities of many issuers, and therefore do not meet the diversification and investment quality standards set forth for money market funds by the Investment Company Act of 1940. Instead. PremierNotes are variable denomination, floating rate demand notes that are unsecured debt obligation of Duke Energy Corporation and are backed only by the assets of Duke Energy Corporation. Your investment in PremierNotes is not equivalent to a deposit or other bank account and is not guaranteed, insured, or subject to the protection of the Federal Deposit Insurance Corporation.

Duke Energy Corporation has filed a registration statement (including a prospectus) with the United States Securities and Exchange Commission (the “SEC”) for the offering to which this communication relates. Before you invest, you should read the prospectus that is included in that registration statement, as well as the other documents that Duke Energy Corporation has filed with the SEC. for more complete information about Duke Energy Corporation and this offering. You may get these documents for free by visiting the SEC website atwww.sec.gov or by downloading them from the Duke Energy PremierNotes website. Alternatively, Duke Energy Corporation will arrange to send you a prospectus if you request it by calling toll free at 800-659-DUKE (3853).

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Moving? Billing Options Rates Investor Economic Development

Customer Service Understand Your Bill Energy Efficiency Services Public Safety Aaset Recovery

Save Energy i. Money Eleotiic Rates Energy Information & Tools Environment Energy Store

Special Assistance Request Service Business Continuity Services Sustainability Architects and Engineers

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PremierNotes Investment Benefits of Ownership Duke Energy Employees & Retirees PremierNotes FAQs Rates Sign Up Today

Open your own PremierNotesSM Investment today—it’s FAST and EASY

It’s as easy as 1-2-3:

1 COMPLETE this simple application form or request an Enrollment Kit by calling 800-659-DUKE (3853) or E-mailing Us

2. WRITE your check for an initial investment of $1,000 or more made payable to “Duke Energy PremierNotes.”

3. SEND your completed application and check to Duke Energy PremierNotes. P.O. Box 75708. Chicago. IL 60675-5708.

Once your application and initial investment are received, you’ll receive a Welcome Kit that confirms your participation and provides information on accessing your secure online portal, along with your first packet of free checks.

Then enjoy the returns on your hard earned cash!

PremierNotesSM Investments

Current Rates

Amount Rate Yield

Less than $10,000 1.30% 1.31%

$10.000 to $49.999 1.50% 1.51%

$50,000 to $250,000 1T014 1.71%

Contact Us

800-659-DUKE or E-mail Us PremierNotesSM Resources

Benefits of Ownership

Duke Energy Employees & Retirees

Enrollment Form

PremierNotes

 

FAQs

Prospectus

Financial SEC Filings

PremierNotes Plan

Rates

www.duke-energy.com/investors/individual-investors/premiernotes-signup (page 2)


LOGO

 

PremierNotes™

Duke Energy PremierNotes earn interest at a floating rate per annum equal to the most recent seven-day average yield (non-compounded} for taxable money funds as reported weekly in the iMoneyNet Money Fund Average,™ plus at least 1/4 percent. Interest is compounded daily and posted to your investment monthly. Investors are encouraged to carefully read the program prospectus and seek professional advice from a financial advisor when considering participation in the PremierNotes program. Interest income is subject to federal and applicable state and local taxes. Overdraft and other fees may apply, as outlined in the program prospectus.

An investment in PremierNotes allows individuals and institutions to benefit from the financial strength of Duke Energy Corporation. PremierNotes are not money market accounts, which are typically diversified funds consisting of short-term debt securities of many issuers, and therefore do not meet the diversification and Investment quality standards set forth for money market funds by the Investment Company Act of 1940. Instead, PremierNotes are variable denomination, floating rate demand notes that are unsecured debt obligation of Duke Energy Corporation and are backed only by the assets of Duke Energy Corporation. Your investment in PremierNotes is not equivalent to a deposit or other bank account and is not guaranteed, insured, or subject to the protection of the Federal Deposit Insurance Corporation.

Duke Energy Corporation has filed a registration statement (including a prospectus (with the United States Securities and Exchange Commission (the “SEC”) for the offering to which this communication relates. Before you invest, you should read the prospectus that is included in that registration statement as well as the other documents that Duke Energy Corporation has filed with the SEC. for more complete information about Duke Energy Corporation and this offering. You may get these documents for free by visiting the SEC website at www.sec.gov or by downloading them from the Duke Energy PremierNotes website. Alternatively, Duke Energy Corporation will arrange to send you a prospectus if you request it by calling toll free at 800-S59-DUKE (3853)

Residential Business Large Business Our Company Doing Business with Us

Billing &. Payment Payment options Standard Services Careers Suppliers

Moving? Billing Options Rates Investor Economic Development

Customer Service Understand You Bill Energy Efficient Services Public Safety Asset Recovery

Save Energy & Money Electric Rates Energy Information & Tools Environment Energy Store

Special Assistance Request Service Business Continuity Services Sustainability Architects and Engineers

Storm & Outage Information Save Energy & Money My Duke Energy Community Builders and Developers

Our Community Product & Services Events Calendar News Property Managers

online Services Outage Information About Us

En Español our Community Online Services

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