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Consolidated Statements Of Cash Flows (Parenthetical) (USD $) In Millions	9 Months Ended
	Sep. 30, 2011	Sep. 30, 2010
Purchases, decommissioning funding	$ 6.4	$ 6.2

X

- Definition

The cash outflow related to funding the decommissioning trust fund.

+ Details

Name:	ee_PaymentsToFundDecommissioningFund
Namespace Prefix:	ee
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration