Brighton Beach Generating Plant Returns to Service

WINDSOR, ONTARIO--(Marketwire - April 29, 2011) - The 580 MW Brighton Beach generating facility in Windsor, Ontario returned to service April 26 following preventive maintenance that began February 4.

The natural-gas-fired facility is an equal partnership between ATCO Power and Ontario Power Generation.

Ontario Power Generation Inc. is an Ontario-based electricity generation company whose principal business is the generation and sale of electricity in Ontario. Our focus is on the efficient production and sale of electricity from our generation assets, while operating in a safe, open and environmentally responsible manner.

ATCO Power, part of the ATCO Group, is a developer, construction manager, owner and operator of technologically advanced and environmentally progressive independent power generation plants. ATCO Power operates power plants in Canada and the United Kingdom with a combined capacity of approximately 4,700 MW. More information can be found at www.atcopower.com.

ATCO Group, with more than 7,700 employees and assets of approximately $10 billion, delivers service excellence and innovative business solutions worldwide with leading companies engaged in Utilities (pipelines, natural gas and electricity transmission and distribution), Energy (power generation, natural gas gathering, processing, storage and liquids extraction), Structures & Logistics (manufacturing, logistics and noise abatement) and Technologies (business systems solutions). Full details can be found at www.atco.com.

Forward-Looking Information:

Certain statements contained in this news release may constitute forward-looking information. Forward-looking information is often, but not always, identified by the use of words such as "anticipate", "plan", "estimate", "expect", "may", "will", "intend", "should", and similar expressions. Forward-looking information involves known and unknown risks, uncertainties and other factors that may cause actual results or events to differ materially from those anticipated in such forward-looking information. The Corporation believes that the expectations reflected in the forward-looking information are reasonable, but no assurance can be given that these expectations will prove to be correct and such forward-looking information should not be unduly relied upon. Any forward-looking information contained in this news release represents the Corporation's expectations as of the date hereof, and is subject to change after such date. The Corporation disclaims any intention or obligation to update or revise any forward-looking information whether as a result of new information, future events or otherwise, except as required by applicable securities legislation.