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Derivative Instruments: (Tables) (GSWC)
9 Months Ended
Sep. 30, 2012
GSWC
 
Derivative instruments  
Schedule of changes in the fair value of the derivative

 

 

 

 

For the Three Months Ended
September 30,

 

For the Nine Months Ended
September 30,

 

(dollars in thousands)

 

2012

 

2011

 

2012

 

2011

 

Balance, at beginning of the period

 

$

(5,176

)

$

(7,475

)

$

(7,611

)

$

(6,850

)

Unrealized gain (loss) on purchased power contracts

 

2,457

 

(101

)

4,892

 

(726

)

Balance, at end of the period

 

$

(2,719

)

$

(7,576

)

$

(2,719

)

$

(7,576

)