Portland

California

TexasArizona

Washington

OregonNew York

Olympia

July 2013

TransAlta USA.Powering Possibilities. Reliably, a� ordably, safely and responsibly, TransAlta USA is helping meet the growing demand for electricity across the United States. Continuing our 100 year tradition as a leading power generator in Canada, our seventeen U.S. plants produce reliable energy from fuel sources including hydro, natural gas, coal and geothermal. TransAlta is planning to grow our operations in the western United States, delivering excellence through a diverse portfolio of power sources and the active pursuit of world-leading technology for a cleaner energy future.

Generation Facilities

Coal-fi red plant Hydro plants Gas-fi red plants Geo-thermal plants Corporate O� ce Energy Marketing O� ce

Did You Know?• TransAlta co-owns one of the world’s largest geothermal

generation operations in California, with 10 plants that produce 340 MW of baseload energy.

• Centralia Generation is Washington State’s largest base- load power source, producing ~10% of the state’s power.

• The Centralia Mine is moving through phases of reclamation. It will ultimately support a wide variety of land uses, including agriculture, industrial, woodlands, wildlife habitat and wetlands.

• Centralia provides a steady need for specialized employment across the Pacifi c Northwest.

• The Centralia facility supports 270 family wage jobs with salary and benefi ts more than 2.4 times the local average.

• Centralia’s annual maintenance and operations expenditures total more than $100 million. Contractors and vendors in Washington and Oregon benefi t from providing goods and services such as engineering, construction, transportation, tool supply and safety support.

Hawaii

United States Plants in Operation

Region FacilityCapacity

(MW)

Ownership

(%)

Net capacity

ownership

interest (MW)

FuelRevenue

source

United States

17 Facilities

2,428 MW

Centralia, WA 1,340 100% 1,340 Coal Merchant

Centralia Gas, WA 248 100% 248 Gas Merchant

Power Resources, TX 212 50% 106 Gas Merchant

Saranac, NY 240 37.5% 90 Gas Merchant

Yuma, AZ 50 50% 25 Gas LTC

Imperial Valley, CA 327 50% 164 Geothermal LTC

Skookumchuck, WA 1 100% 1 Hydro LTC

Wailuku, HI 10 50% 5 Hydro LTC

LTC- Long-term contract (generation is sold under contract to industrial/commercial customer)

Merchant – generation is sold into wholesale power markets

Our CultureTransAlta USA makes decisions ethically and responsibly keeping the interests of our stakeholders in mind. We strive to provide reliable service to our customers, to operate responsibly and transparently, and to ensure the health and safety of employees, our neighbors and the environment. As a result of these commitments, TransAlta has been recognized year after year for its leadership on sustainability by the Dow Jones North American Sustainability Indexes (DJSI), an honor granted to companies that set standards for best practices and demonstrate superior environmental, social and economic performance.

Recent highlights include:

• Regulatory approval of an 11-year power purchase agreement between Centralia and Puget Sound Energy for baseload coal transition power

• Investment of over $300 million to ensure Centralia remains one of the cleanest coal-fi red power plants in North America

• Ongoing reclamation of the Centralia Mine

• Establishment of the Industrial Park at TransAlta

• Centralia named the 2012 Power Plant of the Year by the Powder River Basin Coal User’s Group for having one of the most e� cient and environmentally friendly coal unloading facilities in North America

Contact Information

Paul Taylor, PresidentTransAlta USA Inc. I 724 Columbia Street NWSuite 320 I Olympia, WA 98501 I 360.742.3000

http://www.transalta.com/us/ www.transalta.com

Investing in CommunitiesOne of TransAlta’s core values is to be a leader in our communities. To strengthen the jurisdictions in which we live and work, TransAlta USA has invested more than $10 million, including:

• More than $4.7 million to United Way over the past 12 years

• Almost $1 million to local education, seniors, sport and youth programs

• Over $800,000 through our partnership with Centralia College to program development, scholarships and a new college commons building

• Equipment, volunteer hours and immediate support to Lewis County during the devastating fl oods in 2007

• Up to 1,000 acres and $310,000 to develop an Industrial Park located within Centralia Mine’s boundaries to promote new economic growth

• Funding and volunteer labor each year through TransAlta’s employee-based committee, called TACT or “TransAlta Community Transformers”

Learn more about our community investment program at www.transalta.com/sustainability/community-investment

TransAlta CorporationTransAlta USA is a subsidiary of TransAlta Corporation based in Alberta, Canada. TransAlta began as a small, local power company in 1909 and has grown over the last century to include power plants in Canada, the United States and Australia. With over $2 billion in annual revenue, over 2,600 employees and more than $9 billion in assets, we are Canada’s largest publicly traded generator and marketer of electricity and renewable power.

Partnering for Energy SolutionsEarly in 2011, TransAlta USA reached an historic collaborative agreement with environmental organizations, legislators and labor groups to transition away from coal at the Centralia, WA 1,340 MW coal plant. This agreement allows for:

• Orderly phase-out of coal generation with one of the two coal units retiring in 2020 and the last in 2025

• Protection of jobs and the local economy with a fund set aside to assist with the transition

• Creation of an Energy Technology Fund to create energy, air quality, haze and other environmental benefi ts for the State of Washington

• TransAlta’s further growth through a plan to construct a large-scale natural gas plant at the existing Centralia site

Plant welder Centralia Plant Utility Worker TransAlta Employees planted 50,000 fi r trees in 2012

QuickFacts.Our ExpertiseTransAlta is a responsible operator and a proud contributor to the communities in which we live and work. Today, we have a global team of technical experts committed to operational excellence and the production of clean and a� ordable energy. With diversifi ed operations that include Energy Marketing and power generation in the U.S. across 4 fuel types, we have established a solid platform for growth and a reliable service o� ering for our customers.

At a Glance: TransAlta USA

CE Generation LLCOur plants in Hawaii, California, Arizona, Texas and New York are owned by CE Generation LLC, a partnership between TransAlta and MidAmerican Energy Holdings Company. CE Gen owns 14 plants with a net capacity of 839 megawatts including 3 fuel types: geothermal (327 MW), gas (502 MW), and hydro (10 MW). TransAlta operates the Wailuku Hydro plant in Hawaii; Mid-America operates the other 13.

Energy Marketing TransAlta is an experienced, leading wholesale marketer of electricity servicing the entire western interconnection (WECC), including the Mid-C, California, and Desert Southwest energy markets. Our marketing and trading operation provides transmission and wholesale electricity to satisfy baseload, variable, intermediate and peak power requirements with Renewable Energy Options. We also o� er long-term contracts, structured products, and greenfi eld development solutions for our customers’ needs.

For details, visit www.transalta.com/customers

• Headquartered in Olympia, Washington with a Trading o� ce in Portland, Oregon

• 17 generation facilities in 6 states: Arizona, California, Hawaii, New York, Texas and Washington State

• 1,979 MW of net generation capacity

• Generation in 4 fuel types: hydro, natural gas, coal and geothermal

• 14 facilities in our CE-Gen Partnership with MidAmerican Energy Holdings