Related Party Transactions Related Party Transactions (Tables)

6 Months Ended

Jun. 30, 2013

Related Party Transaction [Line Items]

Schedule of Related Party Accounts Receivable and Payable [Table Text Block]

The balances were as follows (in thousands) as of:

	June 30, 2013		December 31, 2012
Receivables - affiliates	$	4,955	$	5,027
Accounts payable - affiliates	$	15,739	$	21,896

Schedule of Related Party Notes [Table Text Block]

We had the following balances with the Utility Money Pool (in thousands) as of:

	June 30, 2013		December 31, 2012
Money pool notes receivable, net	$	29,459	$	31,645

Schedule of Related Party Interest Income Expense [Table Text Block]

Net interest income (expense) relating to balances with the Utility Money Pool was as follows (in thousands):

	Three Months Ended June 30,				Six Months Ended June 30,
	2013		2012		2013		2012
Net interest income (expense)	$	138	$	168	$	288	$	468

Schedule of Revenues and Purchases from Related Parties [Table Text Block]

related party activity was as follows (in thousands):

	Three Months Ended June 30,				Six Months Ended June 30,
	2013		2012		2013		2012
Revenue:
Energy sold to Cheyenne Light	$	217	$	750	$	357	$	1,276
Rent from electric properties	$	986	$	1,256	$	1,974	$	2,515
Fuel and purchased power:
Purchases of coal from WRDC	$	4,741	$	4,426	$	9,265	$	10,421
Purchase of excess energy from Cheyenne Light	$	969	$	683	$	1,915	$	1,425
Purchase of renewable wind energy from Cheyenne Light - Happy Jack	$	415	$	496	$	1,065	$	1,167
Purchase of renewable wind energy from Cheyenne Light - Silver Sage	$	711	$	793	$	1,796	$	1,870
Corporate support:
Corporate support services and fees from Parent, Black Hills Service Company and Black Hills Utility Holdings	$	7,328	$	5,825	$	15,054	$	10,647