EXHIBIT 11

UNITIL CORPORATION AND SUBSIDIARY COMPANIES

COMPUTATION OF EARNINGS PER WEIGHTED AVERAGE COMMON SHARE OUTSTANDING

(Millions except common shares and per share data)

(UNAUDITED)

	Three Months Ended June  30,					Six Months Ended June  30,
	2010			2009		2010		2009
Net Income (Loss)	$	(2.0	)	$	0.3	$	4.5	$	9.4
Less: Dividend Requirements on Preferred Stock		0.1			0.1		0.1		0.1
Net Income Applicable to Common Stock	$	(2.1	)	$	0.2	$	4.4	$	9.3
Weighted Average Number of Common Shares Outstanding – Basic (000’s)		10,820			9,014		10,810		8,516
Dilutive Effect of Stock Options and Restricted Stock (000’s)		—			—		1		—
Weighted Average Number of Common Shares Outstanding – Diluted (000’s)		10,820			9,014		10,811		8,516
Earnings Per Share – Basic and Diluted	$	(0.19	)	$	0.03	$	0.41	$	1.10