Riverstone Holdings and The Carlyle Group Complete Acquisition of Wild Goose Storage, LLC

New York - On November 16th, 2006, Niska Gas Storage US, LLC ("Niska Gas Storage") completed its acquisition of Wild Goose Storage, LLC ("Wild Goose") from a subsidiary of EnCana Corporation and its Affiliate ("EnCana", NYSE: ECA) for approximately US$200 million. Approval of the change in control of Wild Goose was received from the California Public Utilities Commission ("CPUC") on November 9th, 2006. With the closing of this transaction, the Carlyle/Riverstone Global Energy and Power Funds have completed the acquisition of EnCana’s natural gas storage business.

Wild Goose was the first independent natural gas storage operator in California. Its facility is connected to the Pacific Gas and Electric Company ("PG&E") system and provides its customers with PG&E city-gate access at market-based rates. Wild Goose commenced service in April, 1999 (approximately 14 Bcf) and completed the first phase of its expansion in April, 2004 (to approximately 24 Bcf). It has approval from the CPUC to further expand to approximately 29 Bcf of working gas. The facility currently has maximum daily injection capacity of 450,000 Mcf/d and maximum day withdrawal capacity of 480,000 Mcf/d.

Niska Gas Storage
Niska Gas Storage is the largest independent natural gas storage company in North America. Niska owns and operates approximately 164 Bcf of working gas capacity in three facilities: the AECO Hub™ (comprised of the Suffield and Countess facilities) in Alberta, the Wild Goose facility in northern California and the Salt Plains facility in Oklahoma. As part of the acquisition from EnCana, Niska Gas Storage also acquired certain storage development properties in the United States. With planned additions to and expansions of its facilities, Niska expects to own and operate upwards of 200 Bcf of working gas by 2010.

Niska Gas Storage is a private company owned by the Carlyle/Riverstone Global Energy and Power Funds, SemGroup L.P. and management. For more information on Niska see www.niskags.com/ .