Credit Ratings

A security rating is not a recommendation to buy, sell or hold securities and may be subject to revision or withdrawal at any time by the rating organization. Credit ratings as at February 17, 2010.

Company	Security	DBRS (1)	S&P (2)
Canadian Utilities Limited	Debentures	A	A
	Commercial Paper	R-1 (low)	A-1 (mid)
	Preferred Shares	Pfd-2 (high)	P-2 (high)
CU Inc.	Debentures	A (high)	A
	Commercial Paper	R-1 (low)	A-1 (mid)
	Preferred Shares	Pfd-2 (high)	P-2 (high)

(1) Dominion Bond Rating Service Limited (“DBRS”) maintains a stable trend on the above securities
(2) Standard & Poor’s (“S&P”) maintains a stable trend on the above securities

Credit Rating Definitions

Long Term Debt Credit Ratings

An A rating by DBRS is the third highest of eight categories. Long term debt rated A is of satisfactory credit quality. Protection of interest and principal is still substantial, but the degree of strength is less than that of higher rated entities. While A is a respectable rating, entities in this category are considered to be more susceptible to adverse economic conditions and have greater cyclical tendencies than higher-rated securities. Each rating category is denoted by the subcategories “high” and “low”. The absence of either a “high” or “low” designation indicates the rating is in the “middle” of the category.

An A rating by S&P is the third highest of ten categories. Obligations rated A by S&P are somewhat more susceptible to the adverse effects of changes in circumstances and economic conditions than obligations in higher-rated categories. However, the obligor’s capacity to meet its financial commitment on the obligations is still strong. The addition of a plus or minus sign shows relative standing within the major rating categories.

Commercial Paper Credit Ratings

An R-1 (low) rating by DBRS is the third highest of ten categories and is granted to short term debt of satisfactory credit quality. The overall strength and outlook for key liquidity, debt, and profitability ratios is not normally as favourable as with higher rating categories, but these considerations are still respectable. Any qualifying negative factors that exist are considered manageable, and the entity is normally of sufficient size to have some influence in its industry.

An A-1 (mid) rating by S&P is the second highest of eight categories in its Canadian commercial paper ratings scale and is granted where the obligor’s capacity to meet its financial commitment on the obligation is strong.

Preferred Share Credit Ratings

A Pfd-2 rating by DBRS is the second highest of six categories granted by DBRS. Preferred shares rated Pfd-2 are of satisfactory credit quality. Protection of dividends and principal is still substantial, but earnings, the balance sheet, and coverage ratios are not as strong as higher rated companies. Each rating category is denoted by the subcategories “high” and “low”. The absence of either a “high” or “low” designation indicates the rating is in the “middle” of the category.

A P-2 rating by S&P is the second highest of seven categories S&P uses in its Canadian preferred share rating scale. An obligation rated P-2 exhibits adequate protection parameters. However, adverse economic conditions or changing circumstances are more likely to lead to a weakened capacity of the obligor to meet its financial commitment on the obligation. A plus (+) or minus (-) sign shows relative standing within a rating category.