TransAlta and Pembina Pipeline Announce 100 MW Renewable Power Purchase Agreement and Launch of the Garden Plain Wind Project

TransAlta Corporation announced today the signing of a long-term Power Purchase Agreement ("PPA") with Pembina Pipeline Corporation ("Pembina") for the offtake of 100 MW from its planned 130 MW Garden Plain Wind Power Project ("Garden Plain" or "facility"), which will be situated approximately 30 kilometers north of Hanna, Alberta. Pembina will receive renewable electricity as well as environmental benefits for 18 years under this arrangement. TransAlta will be able to connect the 130 MW Garden Plain Wind Project to its increasing wind generation fleet from this long-term deal with Pembina.

Pembina and TransAlta have agreed to an 18-year power purchase agreement (PPA) for 100 MW, which will begin on Garden Plain's Commercial Operation Date ("COD"). The PPA with Pembina lays the groundwork for the investment in the 130 MW Garden Plain scheme. TransAlta is actively selling the facility's remaining 30 MW to commercial and industrial energy users seeking to minimize the pollution intensity of their activities. If contracts for the remaining 30 MW are not secured, the surplus electricity will be sold in Alberta's merchant wholesale power market.

The project will include 26 Siemens-Gamesa SGRE SG-145 turbines, with construction set to begin in the fall of 2021 and a completion date set for the second half of 2022. The facility will be built, owned, and controlled by TransAlta. The project's total construction capital is expected to be around $195 million.

About Pembina Pipeline Corporation

Pembina is a major logistics and midstream service provider that has been serving the energy industry in North America for over 65 years. Pembina operates an interconnected pipeline system that transports a variety of hydrocarbon liquids and natural gas goods mainly from western Canada. In addition, the company owns gas gathering and processing plants, an oil and natural gas liquids infrastructure and logistics business, and is expanding its export terminals business. Pembina's integrated infrastructure and commercial activities along the majority of the hydrocarbon supply chain allow it to provide the energy sector with a wide range of midstream and marketing services. Pembina is committed to finding additional opportunities to link hydrocarbon production to new demand locations through infrastructure development, which will expand Pembina's service offering even further down the hydrocarbon value chain. These new technologies will help to ensure that hydrocarbons are generated in the Western Canadian Sedimentary Basin and other basins where Pembina operates to meet the world's highest demand markets.

About TransAlta Corporation

TransAlta owns, manages, and builds a diverse fleet of electrical power generation assets in Canada, the United States, and Australia, with a long-term shareholder value in mind. TransAlta delivers clean, affordable, energy-efficient, and reliable power to towns, medium and large enterprises, companies, and service consumers. TransAlta is also one of Canada's biggest wind power producers and Alberta's largest hydroelectric power producer.TransAlta has been a conscientious operator and a proud member of the communities where its workers operate and live for over 100 years. TransAlta aligns its business priorities with the UN Sustainable Development Goals and has been recognized as a market leader in Climate Change Management by CDP (formerly Climate Disclosure Project), having recently earned an A- ranking.