Joint Filing Agreement

Exhibit 1

Joint Filing Agreement

The undersigned hereby agree as follows:

(i)            Each of them is individually eligible to use the Schedule 13D to which this Exhibit is attached, and such Schedule 13D is filed on behalf of each of them; and

(ii)           Each of them is responsible for the timely filing of such Schedule 13D and any amendments thereto, and for the completeness and accuracy of the information concerning such person contained therein; but none of them is responsible for the completeness or accuracy of the information concerning the other persons making the filing, unless such person knows or has reason to believe that such information is inaccurate.

Dated: April 13, 2007

	BGH GP HOLDINGS, LLC
	By:	/s/ Xxxxx Xxxxxxx
		Xxxxx Xxxxxxx
		Manager
	ARCLIGHT CAPITAL PARTNERS, LLC
	By:	/s/ Xxxxxx X. Xxxxxx
		Xxxxxx X. Xxxxxx
		Managing Partner
	ARCLIGHT ENERGY PARTNERS FUND III, L.P.
	By:	ARCLIGHT PEF GP III, LLC, its general partner
	By:	ARCLIGHT CAPITAL HOLDINGS, LLC, its manager
	By:	/s/ Xxxxxx X. Xxxxxx
		Xxxxxx X. Xxxxxx
		Managing Partner

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	ARCLIGHT PEF GP III, LLC
	By:	ARCLIGHT CAPITAL HOLDINGS, LLC, its manager
	By:	/s/ Xxxxxx X. Xxxxxx
		Xxxxxx X. Xxxxxx
		Managing Partner
	ARCLIGHT CAPITAL HOLDINGS, LLC
	By:	/s/ Xxxxxx X. Xxxxxx
		Xxxxxx X. Xxxxxx
		Managing Partner
	XXXXX INVESTMENT ASSOCIATES VII, L.P.
	By:	XXXXX XX VII, L.P., its general partner
	By:	XXXXX XX VII, LLC, its general partner
	By:	/s/ Xxxxx X. Xxxxxxx, XX
		Xxxxx X. Xxxxxxx, XX
		Managing Member
	XXXXX XX VII, L.P.
	By:	XXXXX XX VII, LLC, its general partner
	By:	/s/ Xxxxx X. Xxxxxxx, XX
		Xxxxx X. Xxxxxxx, XX
		Managing Member
	XXXXX XX VII, LLC
	By:	/s/ Xxxxx X. Xxxxxxx, XX
		Xxxxx X. Xxxxxxx, XX
		Managing Member
	KEP VI, LLC
	By:	/s/ Xxxxx X. Xxxxxxx, XX
		Xxxxx X. Xxxxxxx, XX
		Managing Member

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