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USD ($)

USD ($) / shares
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{us-gaap_MajorPropertyClassAxis} : Perry Plant [Member]
1/1/2008 - 12/31/2008
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{us-gaap_MajorPropertyClassAxis} : Beaver Valley Unit 2 [Member]
1/1/2008 - 12/31/2008
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7/13/2007
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12/31/2010
USD ($)

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{us-gaap_MajorPropertyClassAxis} : Beaver Valley Unit 2 [Member]
1/1/2008 - 12/31/2008
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12/31/2010
USD ($)

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12/31/2010
USD ($)
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1/1/2010 - 12/31/2010
USD ($)
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1/1/2009 - 12/31/2009
USD ($)
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1/1/2008 - 12/31/2008
USD ($)
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12/31/2010
USD ($)
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 -Publisher FASB
 -Name Statement of Financial Accounting Standard (FAS)
 -Number 13
 -Paragraph 16
 -Subparagraph c

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 -Publisher FASB
 -Name Statement of Financial Accounting Standard (FAS)
 -Number 13
 -Paragraph 122

Reference 2: http://www.xbrl.org/2003/role/presentationRef
 -Publisher FASB
 -Name Statement of Financial Accounting Standard (FAS)
 -Number 13
 -Paragraph 16
 -Subparagraph b(i)

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