Fair Value Measurements (Tables)

6 Months Ended

Jun. 30, 2011

Disclosure of fair value and related carrying amount of certain financial instruments

The following tables disclose the carrying amount and related fair value of certain financial instruments not disclosed in other notes to the financial statements in this Quarterly Report on Form 10-Q:

Questar

	Carrying	Estimated	Carrying	Estimated	Carrying	Estimated
	Amount	Fair Value	Amount	Fair Value	Amount	Fair Value
	June 30, 2011		June 30, 2010		December 31, 2010
	(in millions)
Financial assets
Cash and cash equivalents	$ -	$ -	$ -	$ -	$ 21.8	$ 21.8
Long-term investment	13.7	13.7	12.5	12.5	13.1	13.1
Financial liabilities
Checks outstanding in excess of cash balances	4.5	4.5	5.8	5.8	-	-
Short-term debt	137.0	137.0	345.0	345.0	242.0	242.0
Long-term debt, including current portion	$983.8	$1,085.7	$831.1	$898.0	$1,080.5	$1,173.8

- Definition

This item represents certain of the disclosures concerning the fair value of financial instruments (as defined), including financial assets and financial liabilities (collectively, as defined), and the measurements of those instruments, assets, and liabilities. Such certain disclosures about the financial instruments, assets, and liabilities include: (1) the fair value of the required items together with their carrying amounts (as appropriate) and (2) the methodology and assumptions used in developing such estimates of fair value.

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