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Derivative Instruments (Tables) (GSWC)

12 Months Ended

Dec. 31, 2012

GSWC

Schedule of changes in the fair value of the derivative

(dollars in thousands)	2012			2011
Balance, at beginning of the period	$	(7,611	)	$	(6,850	)
Unrealized gain (loss) on purchased power contracts	4,551			(761		)
Balance, at end of the period	$	(3,060	)	$	(7,611	)

- Definition

Tabular disclosure of the fair value measurement of assets using significant unobservable inputs (Level 3), a reconciliation of the beginning and ending balances, separately presenting changes during the period attributable to the following: (1) total gains or losses for the period (realized and unrealized), segregating those gains or losses included in earnings (or changes in net assets) and gains or losses recognized in other comprehensive income (loss), and a description of where those gains or losses included in earnings (or changes in net assets) are reported in the statement of income (or activities); (2) purchases, sales, issues, and settlements (each type disclosed separately); and (3) transfers in and transfers out of Level 3 (for example, transfers due to changes in the observability of significant inputs), by class of asset.

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