Completed Merger Table (02.01.09)

Completed Mergers, Acquisitions & Deals Report

Company Names Announcement Closing Date Date Continental Gas Energy systems and PNM Resources January 15, 2008 January 30, 2009 (PNM is selling its natural gas operations) Berkshire Hathaway and Constellation Energy Group September 17, 2008 (MidAmerican Energy, owned by Berkshire Hathaway, is the official Terminated 12/17/08 acquiring party) MDU Resources Group and Intermountain Gas Co. July 1, 2008 October 1, 2008

Sempra Energy and EnergySouth, Inc. July 25, 2008 October 1, 2008

UGI Corp. and PPL Corp. March 5, 2008 October 1, 2008 (UGI Corp. to acquire PPL Gas Utilities Corp. and Penn Fuel Propane)

Iberdrola S.A. and Energy East Corp. June 25, 2007 September 16, 2008

Continental Energy Systems, LLC, and PNM Resources January 15, 2008 (PNM is selling its natural gas operations and buying Continental’s Portion of Deal Terminated electric business/ Continental is the parent company of Semco Energy) July 22, 2008

Great Plains Energy and Aquila February 7, 2007 July 14, 2008 (Aquila's Missouri-based utilities, Missouri Public Service Company and St. Joseph Light & Power) Black Hills and Aquila February 7, 2007 July 14, 2008 (One regulated electric utility in Colorado; Aquila's regulated gas utilities in Colorado, Kansas, Nebraska and Iowa; and a customer service center and centralized natural gas operation in Nebraska) SourceGas LLC (GE) and Southwestern Energy November 14, 2007 July 1, 2008 (Arkansas Western Gas Company)

Updated February 1, 2009 - Page 1 Completed Mergers, Acquisitions & Deals Report

Equitable Resources and Dominion Resources (Pennsylvania March 2, 2006 and West Virginia natural gas distribution assets) Terminated January 15, 2008 Energy West and Sempra Energy February 5, 2007 December 1, 2007 Penobscot Natural Gas Co. Inc. (Maine) Cap Rock Holding Corp. and Semco Energy February 22, 2007 November 9, 2007

Energy West and Sempra Energy February 5, 2007 October 1, 2007 (Frontier Utilities of North Carolina Inc., (North Carolina) Kohlberg Kravis Roberts & Co. and TXU Corp. February 25, 2007 September 7, 2007

National Grid and KeySpan Corp. February 27, 2006 August 25, 2007

Babcock & Brown Infrastructure and Northwestern Energy June 7, 2006 Corp. Terminated July 24, 2007 MDU Resources Group and Cascade Natural Gas Corp. July 9, 2006 July 2, 2007

Northern New England Energy Corp. (Gaz Metro) and Green June 21, 2006 April 12, 2007 Mountain Power Corp.

GE Energy Financial Services and Kinder Morgan (Colorado, August 14, 2006 March 30, 2007 Nebraska, Wyoming and Hermosillo, Mexico, natural gas distribution assets) TransCanada Corp. and El Paso Corp. December 22, 2006 February 22, 2007 (ANR Pipeline Company, ANR Storage Company and 3.55% interest in Great Lakes Gas Transmission Limited Partnership) WPS Resources Corp. and Peoples Energy Corp. July 10, 2006 February 21, 2007

Constellation Energy and FPL Group December 19, 2005 Terminated Oct. 25, 2006

Exelon and PSEG December 20, 2004 Terminated Sept. 15, 2006

National Grid and Southern Union Company (Rhode Island February 16, 2006 August 24, 2006 natural gas distribution assets)

UGI Corp. and Southern Union Company (PG Energy natural gas January 27, 2006 August 24, 2006 utility assets)

WPS Resources and Aquila (MI and MN natural gas operations) September 21, 2005 July 3, 2006

Empire District Electric Company and Aquila (MO natural gas September 21, 2005 June 1, 2006 operations) Duke Energy and Cinergy May 9, 2005 April 3, 2006

MidAmerican Energy Holdings and Pacificorp (Scottish May 24, 2005 March 21, 2006 Power plc) Kinder Morgan and Terasen August 1, 2005 November 30, 2005

Allegheny Energy (Mountaineer Gas and other NG August 4, 2004 September 30, 2005 operations) and IGS Utilities/AchLight Capital Partners PNM Resources Inc. and TNP Enterprises Inc. (Includes Texas- July 25, 2004 June 6, 2005 New Mexico Power Co. & First Choice Power) Saguaro Utility Group and UniSource November, 2003 Terminated Dec. 30, 2004

AGL Resources and NUI Corp. July 15, 2004 December 1, 2004

Ameren Corp. and Illinois Power February 3, 2004 October 1, 2004

Atmos Energy and TXU Gas June 16, 2004 October 1, 2004

AmerenUE and Aquila’s Missouri eastern gas system May 1, 2004

Exelon and Illinois Power Co. September 2003 Terminated 2004 Piedmont Natural Gas Co. and North Carolina Natural Gas October 10, 2002 September 30, 2003 (from Progress Energy) Piedmont Natural Gas Co. and NC Gas (from NUI) May 16, 2002 September 30, 2003 UniSource Energy Corp. and Citizens Communications Co. April 1, 2003 August 11, 2003 gas and electric system assets Southern Union and Panhandle Eastern Pipeline Co. & June 11, 2003 Subsidiaries Oneok and Southern Union Texas Gas Assets January 1, 2003 Ameren and CILCORP April, 2002 January, 2003 Atmos Energy and Mississippi Valley Gas Company September 24, 2001 December 1, 2002 Exelon and Sithe New England Holdings June, 2002 November, 2002 Constellation and NewEnergy Unit of AES June, 2002 September, 2002 E.On and Cinergy and DPL May, 2002 Terminated National Grid and Northeast Utilities May, 2002 Terminated Pepco and Conectiv February 12, 2001 August 1, 2002 Energy East and RGS Energy Group February 20, 2001 June 28, 2002

Xcel Energy and NRG February, 2002 June, 2002 Northwest Natural Gas Co. and Portland General Electric Co. October 8, 2001 Terminated – July 1, Duke Energy and Westcoast Energy Inc. September 21, 2001 March2002 14, 2002 NorthWestern Corp. and Montana Power’s distribution assets October 2, 2000 March 12, 2002 National Grid and Niagara Mohawk Holdings Inc. September 6, 2000 January 31, 2002 MGE and Prairie du Chien December, 2001 December, 2001 Dynegy and Enron November 9, 2001 Terminated – Nov 28, Atmos Energy and Citizens Utilities (Louisiana gas April 13, 2000 July2001 2, 2001 DTEoperations) Energy and MCN Energy October 5, 1999 May 31, 2001 FPL Group and Entergy July 31, 2000 Terminated – Apr 2, 2001 NUI and Virginia Gas Company June 14, 2000 March 28, 2001 Consolidated Edison and Northeast Utilities October 13, 1999 Terminated – Mar 5, 2001 UtiliCorp United and The Empire District Electric Company May 11, 1999 Terminated – Jan 1, 2001 Sierra Pacific and Portland General Electric November 8, 1999 Terminated El Paso Energy and Coastal Corporation January 18, 2000 January 29, 2001 UtiliCorp United and St. Joseph Light & Power March 5, 1999 December 29, 2000 PowerGen plc and LG&E Energy February 28, 2000 December 11, 2000 CP&L and Florida Progress became Progress Energy Inc. August 23, 1999 November 30, 2000 KeySpan Energy Corp. and Eastern Enterprises November 4, 1999 November 8, 2000 Eastern Enterprises and EnergyNorth, Inc. October 10, 1998 November 8, 2000 NiSource and Columbia Energy Group June 3, 1999 November 1, 2000 Vectren Corp and DPL’s natural gas distribution business December 15, 1999 October 31, 2000 AGL Resources and Virginia Natural Gas May 8, 2000 October 6, 2000 Southern Union and Fall River Gas October 5, 1999 September 28, 2000 Southern Union and Providence Energy November 15, 1999 September 28. 2000

Southern Union and Valley Resources, Inc. December 1, 1999 September 20, 2000 Energy East and Berkshire Energy Resources November 10, 1999 September 1, 2000 Energy East and CMP Group June 15, 1999 September 1, 2000 Energy East and CTG Resources, Inc. July 1999 September 1, 2000 Allegheny Energy, Inc. and Mountaineer Gas Company December 20, 1999 August 24, 2000 New Century Energies and Northern States Power March 25, 1999 August 21, 2000 Unicom Corporation and PECO Energy Company became September 23, 1999 August 17, 2000 WisconsinExelon Energy and WICOR June 28, 1999 April 26, 2000 Indiana Energy and SIGCORP became Vectren June 14, 1999 March 31, 2000 Duke Energy and East Tennessee Natural Gas January 4, 2000 March 14, 2000 Berkshire Hathaway and MidAmerican Energy October 25, 1999 March 14, 2000 Northeast Utilities and Yankee Energy Systems, Inc. June 15, 1999 March 1, 2000 SCANA and Public Service Company of North Carolina February 17, 1999 February 9, 2000 Energy East and Connecticut Energy April 23, 1999 February 8, 2000 Dynegy and Illinova June 14, 1999 February 2, 2000 Dominion Resources and Consolidated Natural Gas February 22, 1999 January 28, 2000 ONEOK and Southwest Gas December 14, 1998 Terminated (1/21/99) Southern Union and Pennsylvania Enterprises June 7, 1999 November 4, 1999 SEMCO Energy and ENSTAR Natural Gas July 15, 1999 November 2, 1999 El Paso Energy and Sonat March 15, 1999 October 25, 1999 AES and CILCORP November 23, 1998 October 18, 1999 Kinder Morgan and KN Energy July 8, 1999 October 7, 1999 Eastern Enterprises and Colonial Gas October 10, 1998 August 31, 1999 Boston Edison (BEC) and Commonwealth Energy became December 7, 1998 August 25, 1999 SierraNSTAR Pacific and Nevada Power April 30, 1998 July 28, 1999

Carolina Power & Light and North Carolina Natural Gas November 11, 1998 July 15, 1999 Consolidated Edison and Orange and Rockland May 11, 1998 July 9, 1999 CalEnergy and MidAmerican Energy August 12, 1998 March 12, 1999 NIPSCO Industries and Bay State Gas Co. December 18, 1997 February 12, 1999 Licking Rural Electrification and National Gas & Oil Co. October 28, 1998 Allegheny Power System and DQE (parent of Duquesne) April 7, 1997 Terminated CitizensLight) Utilities and St. Charles Natural Gas Co. August 26, 1998 October 1, 1998 Eastern Enterprises and Essex County Gas Co. December 22, 1997 September 30, 1998 WPS Resources Corp. and Upper Peninsula Energy Corp. July 10, 1997 September 29, 1998 PP&L Resources and Penn Fuel June 1, 1997 August 21, 1998 Northern States Power and Black Mountain Gas December 31, 1997 July 24, 1998 TransCanada Pipelines and NOVA January 26, 1998 July 2, 1998 ENOVA Corp. and Pacific Enterprises October 1, 1996 June 26, 1998 Brooklyn Union Gas Co. and Long Island Lighting Co. December 29, 1996 May 28, 1998 LG&E Energy Corp. and KU Energy May 21, 1997 May 1, 1998 WPL Holdings and IES Industries and Interstate Power November 1, 1995 April 1, 1998 Delmarva Power and Atlantic Energy August 12, 1996 March 2, 1998 KN Energy and MidCon December 18, 1997 January 30, 1998 Sonat Inc. and Zilkha Energy Co. November 23, 1997 January 30, 1998

Updated February 1, 2009 - Page 7