UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

WASHINGTON, D.C. 20549





FORM 10-K/A

Amendment No. 1







|x | Annual Report Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934
|- | ------------------------------------------------------------------------------------

For the fiscal year ended December 31, 2012

OR



| ̈ | Transition Report Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934
|- | ----------------------------------------------------------------------------------------

For the transition period from
 to







|                   |  |                                                                                                                                          |  |                                     
|------------------ |  | ---------------------------------------------------------------------------------------------------------------------------------------- |  | ------------------------------------
|CommissionFile No. |  | Exact name of the Registrant as specified
inits charter, state of incorporation, address ofprincipal executive offices, telephone number |  | I.R.S. EmployerIdentification
Number
|1-8180             |  | TECO ENERGY, INC.                                                                                                                        |  | 59-2052286                          
|                   |  | (a Florida corporation) TECO Plaza 702 N. Franklin Street
Tampa, Florida 33602 (813) 228-1111                                            |  |                                     





Securities registered pursuant to Section 12(b) of the Act:



|                              |  |                                          
|----------------------------- |  | -----------------------------------------
|Title of each class           |  | Name of each exchange on which registered
|TECO Energy, Inc.             |  |                                          
|Common Stock, $1.00 par value |  | New York Stock Exchange                  

Securities registered pursuant to Section 12(g) of the Act: NONE





Indicate by check mark if the registrant is a well-known seasoned issuer, as defined in Rule 405 of the Securities
Act.    YES  x    NO   ̈

Indicate by check mark if the registrant is not required to file reports pursuant to Section 13 or Section 15(d) of the Exchange Act.    YES   ̈    NO  x

Indicate
by check mark whether the registrant (1) has filed all reports required to be filed by Section 13 or 15(d) of the Securities Exchange Act of 1934 during the preceding 12 months (or for such shorter period that the registrant was required
to file such reports), and (2) has been subject to such filing requirements for the past 90 days.    YES  x    NO   ̈

Indicate by check mark whether the registrant has submitted electronically and posted on its
corporate Web site, if any, every Interactive Data File required to be submitted and posted pursuant to Rule 405 of Regulation S-T during the preceding 12 months (or for such shorter period that the registrant was required to submit and post such
files).    YES  x    NO   ̈

Indicate by check mark if disclosure of delinquent filers pursuant to Item 405 of Regulation S-K is not contained herein, and will not be contained, to the best of the registrants knowledge, in
definitive proxy or information statements incorporated by reference in Part III of this Form 10-K or any amendment to this Form 10-K.   ̈

Indicate by check mark whether the registrant is a large accelerated filer, an accelerated filer, a non-accelerated filer, or a smaller reporting
company. See the definitions of large accelerated filer, accelerated filer and smaller reporting company in Rule 12b-2 of the Exchange Act.



|                        |  |   |  |                           |  |  
|----------------------- |  | - |  | ------------------------- |  | -
|Large accelerated filer |  | x |  | Accelerated filer         |  |  ̈
|                        |  |   | 
|Non-accelerated filer   |  |  ̈ |  | Smaller reporting company |  |  ̈

Indicate by check mark whether the registrant is a shell company (as defined in Rule 12b-2 of the
Act).    YES   ̈    NO  x

The aggregate market value of all common stock held by non-affiliates of the registrant as of June 29, 2012 was approximately $3.85 billion based on the closing sale price as reported on the New York
Stock Exchange.

The number of shares of TECO Energy, Inc.s common stock outstanding as of Feb. 15, 2013 was 217,255,694.

DOCUMENTS INCORPORATED BY REFERENCE

Portions of the Definitive Proxy Statement relating to the 2013 Annual Meeting of Shareholders of TECO Energy, Inc. are incorporated by reference into Part III.









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EXPLANATORY NOTE

TECO Energy, Inc. is filing this Amendment No. 1 (Form 10-K/A) to its Annual Report on Form 10-K for the year ended December 31, 2012, originally filed with the Securities and
Exchange Commission on February 26, 2013 (Form 10-K), solely for the purpose of correcting information contained in Exhibit 95 thereto. Attached to this Form 10-K/A is an amended and restated Exhibit 95.

Except as described above, no other changes have been made to the Form 10-K. This Form 10-K/A does not reflect events occurring after the filing of the
Form 10-K or modify, amend or update in any way any financial information or other disclosure contained in the Form 10-K other than as described above.



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SIGNATURES

Pursuant to the requirements of Section 13 or 15(d) of the Securities Exchange Act of 1934, the Registrant has duly caused this report to be signed on its behalf by the undersigned, thereunto duly
authorized.



| |  |                      |  |  |  |                   |  |                                                                                                    
| |  | -------------------- |  |  |  | ----------------- |  | ---------------------------------------------------------------------------------------------------
| |  |                      |  |  |  | TECO ENERGY, INC.
| |  |                      |  | 
| |  | Dated: March 4, 2013 |  |  |  | By:               |  | /s/ SANDRA W. CALLAHAN                                                                             
| |  |                      |  |  |  |                   |  | SANDRA W. CALLAHAN                                                                                 
| |  |                      |  | 
| |  |                      |  |  |  |                   |  | Senior Vice President-Finance and Accounting and Chief Financial Officer (Chief Accounting Officer)
| |  |                      |  |  |  |                   |  | (Principal Financial and Principal Accounting Officer)                                             



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INDEX TO EXHIBITS



|           |  |                                                                                                                                                                                                           
|---------- |  | ----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
|ExhibitNo. |  | Description                                                                                                                                                                                               
|           | 
|31.1       |  | Certification of the Chief Executive Officer of TECO Energy, Inc. pursuant to Securities Exchange Act Rules 13a-14(a) and 15d-14(a) as adopted pursuant to Section 302 of the
Sarbanes- Oxley Act of 2002.
|           | 
|31.2       |  | Certification of the Chief Financial Officer of TECO Energy, Inc. pursuant to Securities Exchange Act Rules 13a-14(a) and 15d-14(a) as adopted pursuant to Section 302 of the
Sarbanes- Oxley Act of 2002.
|           | 
|95         |  | Mine Safety Disclosure.