BEFORE THEPENNSYLVANIA PUBLIC UTILITY COMMISSION

Petition of PECO Energy Company for ) Docket No. P-2012-2283641Approval of Its Default Service Program )

PETITION TO INTERVENE OFEXELON GENERATION COMPANY, LLC

AND EXELON ENERGY COMPANY

Pursuant to 52 Pa. Code. § 5.71 et seq., Exelon Generation Company, LLC and Exelon

Energy Company (collectively, “ExGen”) hereby file this Petition to Intervene in the above-

captioned proceeding. In support of this Petition, ExGen states as follows:

I. BAcKGROuND

1. On January 13, 2012, PECO Energy Company filed a Petition for Approval of its Default

Service Programs with the Pennsylvania Public Utility Commission (“Commission”).

2. By notice filed in the Pennsylvania Bulletin on Jan 18, 2012, the Commission directed

that formal protests, petitions to intervene, and answers to PECO’s petition be filed with the

Secretary of the Commission on or before February 13, 2012.

3. ExGen is filing this Petition to Intervene consistent with the Commission’s notice.

II. PETITION TO INTERVENE

4. Eligibility to intervene in Commission proceedings is governed by 52 Pa. Code § 5.72.

This section provides, in relevant part, that “[aJ petition to intervene may be filed by a person

claiming a right to intervene or an interest of such nature that intervention is necessary or

appropriate to the administration of the statute under which the proceeding is brought.”

5. Section 5.72 further provides that the right or interest may be one “which may be directly

affected and which is not adequately represented by existing participants, and as to which the

petitioner may be bound by the action of the Commission in the proceeding.”2

6. ExGen owns or controls approximately 31,000 MW of generation supply and is a leading

wholesale power marketer throughout the nation, including through participation in utility load

auctions. Exelon Energy Company is a wholly owned subsidiary of ExGen and a licensed

Electric Generation Supplier (“EGS”) in Pennsylvania.

7. Issues related to this Default Service proceeding may significantly affect the rules

governing the provision of power in Pennsylvania. Accordingly, ExGen may be directly affected

by this proceeding’s outcome and may be bound by any Commission decision herein with

respect to the provision of electric retail default service and competitive procurement plans.

8. For these reasons, no other party can adequately represent ExGen’s interest in this

proceeding. Thus, ExGen’s Petition to Intervene should be granted.

9. Because of the early stage of this proceeding, ExGen is still formulating its position on

the proposed Default Service Plan and will finalize its position after it has had an opportunity to

further study and evaluate the filings, conduct discovery, and obtain additional information as

necessary.

‘52 Pa. Code § 5.72(a).

2 52 Pa. Code § 5.72(a)(2).

2

III. INFORMATION FOR SERVICE

10. ExGen is represented in the above-captioned matter by the following counsel, and all

correspondence should be directed to them at the following addresses:

Thomas McCann Mullooly3Trevor D. StilesFoley & Lardner LLP777 East Wisconsin AvenueMilwaukee, WI 53202(414) 297-5566tmullooly@foley.comtstiles@foley.com

With a copy to:

Amy E. HamiltonDirector, Public PolicyExelon Generation Company300 Exelon WayKennett Square, PA 19348(610) 765-6933amy.hamilton@exeloncorp.com

IV. CoNcLusIoN

WHEREFORE, in consideration of the foregoing, ExGen respectfully requests that the

Presiding Officer grant ExGen full status as an intervenor in this proceeding.

Concurrent with this Petition to Intervene, Mr. Trask has filed a Motion for Admission Pro Hac Vice forMr. Mullooly and Mr. Stiles.

3y

Dated: February 13, 2012 Respectfully submitted,

ExEL0N GENERATIoN COMPANY, LLC AND

ExEL0N ENERGY COMP

Thomas McCann MulloolyTrevor D. StilesFoley & Lardner LLP777 East Wisconsin AvenueMilwaukee, WI 53202(414) 297-5566tmullooly@foley.comtstiles@foley.com

Noel TraskAssociate General CounselExelon Business Servs. Co., LLC300 Exelon WayKennett Square, PA 19348(610) 765-6649Noel.Trask@exeloncorp.com

Counselfor Exelon Generation Company, LLCand Exelon Energy Company

4

BEFORE THEPENNSYLVANIA PUBLIC UTILITY COMMISSION

Petition of PECO Energy Company for ) Docket No. P-2012-2283641Approval of Its Default Service Program )

CERTIFICATE OF SERVICE

I hereby certify that I have this day served a copy of Exelon Generation Company, LLCand Exelon Energy Company’s Petition to Intervene and Motion for Admission Pro Hac Vice inthe above-captioned proceeding on the following as permitted by 52 Pa. Code § 1.54:

Administrative Law Judge Dennis J BuckleyP0 Box 3265 JOHNNIE E SIMMS ESQUIREHarrisburg, PA 17 105-3265 PA PUC BUREAU OF INVESTIGATION

& ENFORCEMENTJEANNE DWORETZKY ESQUIRE P0 BOX 3265ANTHONY E GAY ESQUIRE HARRISBURG PA 17105-3265EXELON BUSINESS SERVICESCOMPANY STEVE PINCUS ESQUIRE2301 MARKET STREET S23-1 PJM INTERCONNECTIONP0 BOX 8699 VALLEY FORGE CORPORATE CENTERPHILADELPHIA PA 19 103-8699 055 JEFFERSON AVENUE

NORRISTOWN PA 19403-2497THOMAS P GADSDEN ESQUIREKENNETH M KULAK ESQUIRE ACCLAIM ENERGY ADVISORSBROOKE E LEACH ESQUIRE TWO RIVERWAY SUITE 800MORGAN LEWIS & BOCKIUS LLP HOUSTON TX 770561701 MARKET STREETPHILADELPHIA PA 19103-2921 ADL HIGH VOLTAGE INC

629 DEERWOOD LANEIRWIN A POPOWSKY ESQUIRE KELLER TX 76248OFFICE OF CONSUMER ADVOCATE5TH FLOOR FORUM PLACE ADVANTATE IQ INC555 WALNUT STREET 1620 SOUTH FRONTAGE ROADHARRISBURG PA 17101-1923 HASTINGS MN 55033

STEPHEN C GRAY ESQUIRE AFFINITY ENERGY MANAGEMENTELIZABETH ROSE TRISCARI ESQUIRE LLCOFFICE OF SMALL BUSINESS 220 CHERRY BLOSSOM PLACEADVOCATE HOCKESSIN DE 197071102 COMMERCE BUILDING300 NORTH 2ND STREET AFFILIATED POWER PURCHASERSHARRISBURG PA 17101 INC

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BRADLEY R LEWIS

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1218 CHESTNUT STREET

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54815-1649-6654.1

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I C THOMASSON ASSOICATES INC

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481 5-1649-6654.16

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4815-1649-6654.17

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84815-1649-6654.1

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104815-1649-6654.1

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11

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124815-1649-6654.1

Dated: February 13, 2012 Is! Trevor D. Stiles

Trevor D. StilesFoley & Lardner LLP777 East Wisconsin AvenueMilwaukee, WI 53202(414) 319-7346tstiles@foley.com

Counselfor Exelon Generation Company, LLCand Exelon Energy Company

4815-1649-6654.1