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SENIOR ENGINEERING COMPANY
Name changed to Senior Flexonics Inc after Flexonics companies were purchased by Senior Engineering in 1992.



PETROVENTURES RESOURCES LTD
Dissolved March 1994.



PETROWEST MANAGEMENT SERVICES LTD
Dissolved May 1995.



PHILADELPHIA ELECTRIC CO
see Peco Energy Co.



PICT PETROLEUM PLC
Acquired by Premier Oil Plc in 1995.



DISCOVERY PETROLEUM
Acquired by Premier Oil Plc in 1996.



DOME CANADA
Renamed Encor Energy Inc.



PLACID OIL COMPANY
Acquired by Oxy USA in December 1994. See Occidental Gas Corporation



PLAINS PETROLEUM COMPANY
Acquired by Williams Production RMT Company in July 1995.



POCO PETROLEUMS LIMITED
Acquired by Burlington Resources Inc in November 1999, see Burlington Resources Canada Ltd



POCATERRA ENERGY INC
Acquired by Buffalo Oil Corporation in December 2006



POTASH COMPANY OF AMERICA
Acquired by the Potash Corp of Saskatchewan Inc in October 1993



POTASH COMPANY OF CANADA
Acquired by the Potash Corp of Saskatchewan Inc in October 1993



PP&L RESOURCES INC
See PPL Corp



PRAIRIE FIRE OIL & GAS LTD
Amalgamated with a subsidiary of Vermilion Energy Trust in June 2004



PRAIRIE PACIFIC ENERGY CORPORATION
Acquired by Pogo Producing Company's subsidiary Northrock Resources Ltd in 2006



PRECAMBRIAN SHIELD RESOURCES LTD
Acquired by Enerplus Energy Corporation. See Enerplus Resources Fund.



PREMIER CONSOLIDATED OILFIELDS PLC
Changed name to Premier Oil Plc in 1998.



PHILLIPS PETROLEUM INTERNATIONAL SAMAR LIMITED
Dissolved in September 1980.



PRENALTA CORPORATION
Out of business in 1997



PRENTICE NAPIER & GREEN INC
See Png Operating Co.



PRESIDIO OIL COMPANY
see Tom Brown, Inc.



PRESTON ELECTRIC CO
Acquired by Monongahela Power Co in 1988



PREUSSENELEKTRA AG
Combined with Bayernwerk AG by E.ON AG in 2000 to form E.ON Energie AG



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