The Climate Registry is a non-profit organization established to measure and publicly report greenhouse gas emissions (GHG) in a common, accurate and transparent manner consistent across industry sectors and borders. Thirty-nine U.S. states, five Canadian provinces, three Native American tribes, two Mexican states and the District of Columbia are the founders of the organization.

“APS and SRP have demonstrated exemplary environmental leadership by stepping forward to support The Climate Registry in its preliminary stages. We are deeply grateful for their integral support in helping to address the challenge of climate change,” said Gina McCarthy, Chair of The Climate Registry.

Forerunners in the electric utility industry, APS and SRP have demonstrated environmental stewardship on several fronts by voluntarily committing to measure, independently verify, and publicly report their GHGs on an annual basis utilizing The Climate Registry General Reporting Protocol.

The protocol is based on the internationally recognized GHG measurement standards of the World Resources Institute and World Business Council on Sustainability.

In addition, APS and SRP are both involved in examining technologies to control CO₂ emissions from fossil fuel power plants. The two utilities are also collaborating in the WESTCARB Arizona Utilities CO₂ Storage Pilot project. This project is taking place at the APS Cholla Power plant and is to examine the feasibility of storing carbon dioxide underground as a way to manage greenhouse gas emissions.

“SRP is committed to implementing a portfolio of balanced solutions to reduce greenhouse gas emissions over time, which includes accurately measuring and reporting our greenhouse gases consistent with nationally recognized protocols,” said Richard Hayslip, SRP’s Associate General Manager.

“APS’ membership in The Climate Registry is a tangible action toward creating a sustainable future for our society. We must address global warming by tracking emissions and reducing them in a cost effective manner,” said Ed Fox, APS’ Vice President and Chief Sustainable Officer.

Entities that join before May, 2008, are eligible to receive Founding Reporter status.

SRP is the largest provider of power to the greater Phoenix metropolitan area, serving more than 925,000 electricity customers. For more information, visit www.srpnet.com.

APS, Arizona’s largest and longest-serving electricity utility, serves about 1.1 million customers in 11 of the state’s 15 counties. With headquarters in Phoenix, APS is the largest subsidiary of Pinnacle West Capital Corp. (NYSE: PNW)

About The Climate Registry

Incorporated March 2007 in Washington, DC, The Climate Registry provides accurate and transparent measurement of GHG emissions and ensures consistency of measurement metrics across industry sectors and borders. The Climate Registry accounting infrastructure supports both voluntary and regulatory programs. For more information please visit, www.theclimateregistry.org.