EXHIBIT 12.1

Statement Regarding Computation of Ratios

	Year ended December 31,			Nine Months Ended September 30,		Eleven Months Ended August 31,	Year ended August 31,	Year ended August 31,		Pro Forma Year ended August 31, 2005		Three Months Ended February 28,	Six Months Ended February 28,
	2000		2001	2002		2003	2004	2005		HPL System		2006	2006
Fixed charges
Interest expensed	12,098		6,858	3,931		12,456	41,190	93,017		109,925		28,542	56,935
Capitalized interest	70		86	35		—	926	191		191		2,014	2,321
Loss on extinquishment of debt	—		—	—		—	—	9,550		9,550		—	—
Implicit interest in rent expense	41		65	41		39	133	946		1,769		411	842
	12,209		7,009	4,007		12,495	42,249	103,704		121,435		30,967	60,098
Earnings:
Income from continuing operations before minority interests and income taxes	18,892		41,161	4,272		45,063	97,765	209,409		237,011		255,348	399,122
Less: equity in earnings (losses) of affiliates	(14	)	3,128	5,425		1,423	363	(376	)	(392	)	106	(168	)
	18,906		38,033	(1,153	)	43,640	97,402	209,785		237,403		255,242	399,290
Add:
Fixed charges	12,209		7,009	4,007		12,495	42,249	103,704		121,435		30,967	60,098
Amortization of capitalized interest	76		79	62		—	1	15		15		4	8
Distributed income of equity investees	—		1,500	4,000		1,000	27	—		—		—	—
Less:
Interest capitalized	70		86	35		—	926	191		191		2,014	2,321
Income available for fixed charges	31,121		46,535	6,881		57,135	138,753	313,313		358,662		284,199	457,075
Ratio of earnings to fixed charges	2.55		6.64	1.72		4.57	3.28	3.02		2.95		9.18	7.61