CONDENSED CONSOLIDATED STATEMENTS OF FINANCIAL POSITION (USD $) In Thousands	Jun. 30, 2011	Dec. 31, 2010
Current assets
Cash and cash equivalents	$ 81,235	$ 95,109
Accounts receivable	93,177	80,417
Inventory	39,749	42,286
Deferred income taxes	9,529
Regulatory assets - revenue accrual, including accrued interest	16,341	28,637
Other	6,895	5,293
Total current assets	246,926	251,742
Property, plant and equipment (net of accumulated depreciation and amortization of $1,158,062 and $1,129,669, respectively)	3,097,923	2,872,277
Other assets
Goodwill	950,163	950,163
Intangible assets (net of accumulated amortization of $13,726 and $12,176, respectively)	48,435	49,985
Other regulatory assets	148,757	138,152
Deferred financing fees (net of accumulated amortization of $12,845 and $11,750, respectively)	22,096	19,949
Other	30,034	25,605
Total other assets	1,199,485	1,183,854
TOTAL ASSETS	4,544,334	4,307,873
Current liabilities
Accounts payable	98,187	66,953
Accrued payroll	12,141	18,606
Accrued interest	43,029	42,725
Accrued taxes	29,753	19,461
Regulatory liabilities - revenue deferral, including accrued interest	30,543	17,658
Refundable deposits from generators for transmission network upgrades	25,372	10,492
Other	4,102	6,509
Total current liabilities	243,127	182,404
Accrued pension and postretirement liabilities	37,863	35,811
Deferred income taxes	367,803	314,979
Regulatory liabilities - revenue deferral, including accrued interest	36,038	43,202
Regulatory liabilities - accrued asset removal costs	88,601	90,987
Refundable deposits from generators for transmission network upgrades	3,812	14,515
Other	11,169	11,646
Long-term debt	2,565,769	2,496,896
Commitments and contingent liabilities (Note 12)
STOCKHOLDERS' EQUITY
Common stock, without par value, 100,000,000 shares authorized, 51,291,683 and 50,715,805 shares issued and outstanding at June 30, 2011 and December 31, 2010, respectively	909,669	886,808
Retained earnings	280,246	229,437
Accumulated other comprehensive income	237	1,188
Total stockholders' equity	1,190,152	1,117,433
TOTAL LIABILITIES AND STOCKHOLDERS' EQUITY	$ 4,544,334	$ 4,307,873