SECURITIES AND EXCHANGE COMMISSION

Washington, DC 20549

FORM 6-K

REPORT OF FOREIGN PRIVATE ISSUER

Pursuant to Rule 13a-16 or 15d-16 of

the Securities Exchange Act of 1934

For the Month of May, 2012

KOREA ELECTRIC POWER CORPORATION

(Translation of registrant’s name into English)

167 Samseongdong, Gangnam-gu, Seoul 135-791, Korea

(Address of principal executive offices)

Indicate by check mark whether the registrant files or will file annual reports under cover of Form 20-F or Form 40-F.

Form 20-F  x            Form 40-F  ¨

Indicate by check mark if the registrant is submitting the Form 6-K in paper as permitted by Regulation S-T Rule 101(b)(1):  ¨

Indicate by check mark if the registrant is submitting the Form 6-K in paper as permitted by Regulation S-T Rule 101(b)(7):  ¨

Indicate by check mark whether the registrant by furnishing the information contained in this form is also thereby furnishing the information to the Commission pursuant to Rule 12g3-2(b) under the Securities Exchange Act of 1934.

Yes  ¨            No  x

If “Yes” is marked, indicate below the file number assigned to the registrant in connection with Rule 12g3-2(b): 82-            .

This Report of Foreign Private Issuer on Form 6-K is deemed filed for all purposes under the Securities Act of 1933, as amended, and the Securities Exchange Act of 1934, as amended.

Korea Electric Power Corporation (“KEPCO”) hereby announces its unaudited estimated earnings results for the first three months ended March 31, 2011 and 2012 as attached hereto.

Disclaimer:

The financial information relating to the results of operations of KEPCO for the first three months of 2011 and 2012 as presented below (the “Information”) has been prepared by KEPCO based on preliminary internal estimates and in accordance with IFRS. The Information has neither been audited nor reviewed by KEPCO’s independent accountants, Deloitte Anjin LLC., or any other independent public accountants. The Information may differ significantly from the actual financial results of operations of KEPCO for the first three months of 2012, and accordingly should not be relied upon for investment, including but not limited to purchase of any securities, or for other purposes.

Korea Electric Power Corporation

PRELIMINARY CONSOLIDATED STATEMENTS OF OPERATIONS

(Neither audited or reviewed)

For the three months ended March 31, 2011 and 2012

(Unit : in billions of Korean Won)	1Q 2012			1Q 2011			Change
Operating revenues:		13,303			10,800			23.2	%
Sale of electric power		12,452			10,302			20.9	%
Other		851			498			70.8	%
Cost of goods sold & selling and administrative expenses:		13,619			11,468			18.8	%
Fuel		6,930			5,945			16.6	%
Purchased power		2,850			2,021			41.0	%
Depreciation		1,574			1,441			9.2	%
Maintenance		317			352			-10.0	%
Commissions		190			179			6.4	%
Research and development		110			101			9.2	%
Other		1,647			1,429			15.3	%
Other revenues		175			151			15.9	%
Other expenses		22			27			-20.2	%
Other Income		57			68			-16.4	%
Operating income (loss)		(105	)		(476	)		77.9	%
Finance income:		224			417			-46.1	%
Interest income		41			33			25.0	%
Gain on foreign currency translation and transaction		150			295			-49.3	%
Gain on financial derivatives		26			72			-63.2	%
Other		7			16			-58.7	%
Finance expenses:		652			693			-6.0	%
Interest expense		561			511			9.8	%
Loss on foreign currency translation and transaction		16			31			-49.3	%
Loss on financial derivatives		75			151			-50.3	%
Equity income (loss) of affiliates, net		86			144			-40.1	%
Income (Loss) before income tax		(447	)		(608	)		26.6	%
Income tax expenses (benefits)		66			(64	)		n/m
Net Income (loss)		(513	)		(544	)		5.7	%
Net income (loss) attributable to:
Non-controlling interests		25			6			n/m
Owners of the company		(538	)		(550	)		2.1	%

* The figures may not add up due to rounding.

Korea Electric Power Corporation

PRELIMINARY NON-CONSOLIDATED STATEMENTS OF OPERATIONS

(Neither audited or reviewed)

For the three months ended March 31, 2011 and 2012

(Unit : in billions of Korean Won)	1Q 2012			1Q 2011			Change
Operating revenues:		13,259			10,735			23.5	%
Sale of electric power		12,675			10,485			20.9	%
Other		583			251			132.7	%
Cost of goods sold & selling and administrative expenses:		15,462			12,290			25.8	%
Purchased power		13,586			10,605			28.1	%
Other		1,876			1,685			11.3	%
Other revenues		134			124			8.4	%
Other expenses		7			14			-46.0	%
Other Income		38			34			12.8	%
Operating income (loss)		(2,038	)		(1,411	)		-44.5	%
Finance income:		1,036			888			16.7	%
Interest income		17			22			-23.0	%
Dividend income		929			714			30.2	%
Gain on foreign currency translation and transaction		74			140			-47.1	%
Gain on financial derivatives		16			11			37.7	%
Finance expenses:		396			387			2.4	%
Interest expense		383			346			10.8	%
Loss on foreign currency translation and transaction		4			24			-82.8	%
Loss on financial derivatives		9			18			-47.3	%
Income before tax		(1,398	)		(910	)		-53.7	%
Tax expense		(524	)		(325	)		-61.1	%
Net income		(874	)		(584	)		-49.6	%

* The figures may not add up due to rounding.

SIGNATURES

Pursuant to the requirements 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.

By:	/s/ Kim, Jung In
Name: Kim, Jung In
Title: Vice President

Date: May 17, 2012