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Restricted cash	3 Months Ended
Restricted cash	Mar. 31, 2015
Cash and Cash Equivalents [Abstract]
Restricted cash	Restricted cash In March 2015, we posted $21,000 cash collateral with EDF for the annual MISO power capacity auction and recorded restricted cash deposits. We collateralized the obligation with cash because we were approaching the limit of our letter of credit sub-facility under our U.S. credit facility as a result of additional letters of credit issued to Santee Cooper for the Mt. Holly acquisition. In April 2015, EDF released back to Century our $21,000 cash collateral because it was no longer required based on the final auction clearing price.

The entire disclosure for cash and cash equivalent footnotes, which may include the types of deposits and money market instruments, applicable carrying amounts, restricted amounts and compensating balance arrangements. Cash and equivalents include: (1) currency on hand (2) demand deposits with banks or financial institutions (3) other kinds of accounts that have the general characteristics of demand deposits (4) short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates. Generally, only investments maturing within three months from the date of acquisition qualify.

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