Patrick F. Ledger, Chief Executive Officer
Patrick Ledger was named CEO of Arizona G&T Cooperatives in February 2011. Ledger joined the cooperatives in 2002 as corporate counsel. He moved on to become senior vice president and chief operating officer (COO). He earned a bachelor’s degree from Colorado College, and master’s and juris doctor degrees from the University of Arizona.
Division Managers Group
Jon Martell, Executive Director of Energy Services
Jon Martell returned to Arizona G&T Cooperatives as executive director of Energy Services in January 2017. Before that, he spent four years with ACES as portfolio director for the Western Regional Trading Center (WRTC), where he did an excellent job building the West RTC’s capabilities and developing a dynamic group that has served AzGT Members and customers well.
Before joining ACES Jon started his career with AEPCO in 1992 at Apache Station as a laborer. Over the next five years Jon was promoted up through the ranks in plant operations and capped off that time in the position of control room operator. Jon then moved into AEPCO’s System Control Center as a power controller. In 2001, he transferred over to AEPCO’s Power Trading Department as an hourly trader and held that title until he moved into the day ahead trader position in 2005. As a day ahead trader he not only traded and scheduled power, but he also traded and scheduled natural gas to Apache Station. In 2007, he moved into the role of transmission services manager for Southwest Transmission Cooperative, where he streamlined the AEPCO member billing process. In 2011 when AEPCO transferred its power trading staff to ACES, Jon transferred to Sierra Southwest Cooperative as the energy services manager. He then joined ACES as the portfolio director of the WRTC when that opportunity arose in November 2012. Jon has an AS degree in Electronic Technology from Cochise College in Douglas, AZ.
Barry Brown was named as an executive director in 2016. He supervises transmission engineering and operations, file administration, drafting, and geographical information system services. Barry joined Arizona G&T Cooperatives in 1988, and became engineering manager for generation projects in 2007. He was named director of engineering in 2012 before his role expanded to its current duties. He has managed projects including upgrading coal handling systems; replacing cooling towers; and installing gas burning, emissions reduction and distributive control systems.
The Cooperative Research Network appointed Barry to its Member Advisory Group on Generation, Fuels, and Environment. He’s also a member of the National Rural Electric Cooperative Association (NRECA) G&T Balance Scorecard Committee.
He earned his bachelor’s in mechanical engineering from New Mexico State University. While in college, Barry worked summers at the Rocky Flats nuclear facility and Los Alamos National Laboratory. After graduating, he returned to Los Alamos National Laboratory as an engineer.
Michelle Freeark began her career with Arizona G&T Cooperatives in 2005 as an environmental planner, and moved up to manage environmental, safety and health issues and compliance. She was promoted director of environmental services in 2011. Her role expanded to executive director in 2016.
Michelle supervises the cooperatives’ Legal, Environmental, Safety, Land Services, and Planning Departments. Much of the environmental safety and compliance issues handled by the division relate to air, waste and water. Periodic audits assure compliance. In addition, Michelle’s team handles wildlife issues along our transmission lines and other properties. A big part of Michelle’s job includes monitoring and commenting on proposed federal and state environmental regulations. Michelle is president of the National Rural Electric Environmental Association, and serves on the environmental subcommittee of the NRECA Technical Advisory Committee. She earned her bachelor’s in environmental science from Northern Arizona University.
Few people have Mike Nelson’s level of experience and knowledge in managing a generating facility. Apache Generating Station operates 24/7, 365 days a year. Under Mike’s direction, Apache Station is one of the most reliable plants of its type and size in the U.S. The plant consistently earns a 97-plus percent rating.
Mike’s responsibilities as director of power production include planning; regulatory affairs; mechanical, instrument and electrical maintenance; and managing fuel and limestone quality. He brings his expertise to the following areas:
- Managing the plant’s generation assets
- Managing exempt, non-exempt and bargaining-unit plant personnel, including negotiating and managing labor union agreements
- Facilitating fuel and material negotiations and procurement
- Reviewing, approving and prioritizing generation-related capital projects
- Managing North American Electric Reliability Corporation (NERC) and Western Electricity Coordinating Council (WECC) compliance for the plant
- Blending coal, which results in higher efficiencies and fuel savings leading to lower and more stable rates for members, and
- Managing generating unit maintenance. His team has conducted 10 successful major overhauls on a six-year cycle and 30 annual overhauls.
Mike joined Arizona G&T Cooperatives in 1977, and has worked as fuel material handler, auxiliary operator, control room operator, shift supervisor, operations manager and manager of power production. He is a member of the Cooperative Research Network’s committee on generation and power production, and the Electrical Utility Cost Group/EECG, through which generation and transmission utilities share best practices.
As director of systems operations, Shane Sanders manages a team that works around the clock to ensure system reliability by monitoring and controlling more than 600 miles of transmission lines and associated substations, more than 800 MW of peak load, and more than 1200 MW of generation. His team works with a SCADA system that provides refreshed system data every two to four seconds and real-time operations control.
Shane began working for Arizona G&T Cooperatives in 1985 at Apache Generating Station. He transferred to the Benson headquarters as a power systems controller in 1991, and moved to power trading in 1999. In 2004, Shane became systems control manager. In 2007, he was promoted to manager of systems operations, where his responsibilities included the pre-schedule and transmission billing departments. In 2011, another promotion made him director of systems operations.
Pete Scott has been with Arizona G&T Cooperatives since December 2011. He has more than 20 years of finance and accounting experience. Before joining Arizona G&T Cooperatives, he was director of finance and human resources and assistant secretary to the board at Labcyte Inc., a biotech manufacturing company in California’s Silicon Valley. At Labcyte, he oversaw the financial operations of a worldwide technology company with subsidiaries in five countries. He helped the company raise several rounds of private equity investment, managed the financial and accounting details of two corporate mergers, and negotiated and managed numerous private lines of credit and venture debt.
Previously, he was senior manager of accounting at Picoliter Inc. in Sunnyvale, Calif., and accounting manager at AlphaGraphics in Tucson. He has a bachelor’s degree from Colorado College and completed his CPA coursework at the University of Arizona.
Emery Silvester’s career with Arizona G&T Cooperatives stretches over the past 24 years. Most of his time has been spent managing the human resources area. He started out as an employment representative, and his responsibilities grew to include managing administrative services and overseeing human resource management for the cooperatives’ more than 220 employees. His work involves relations with union and non-union employees.
Emery has been instrumental in developing employee health through a Wellness Committee that offers onsite programs. As a result of these programs, we expect to see savings in the cost of health care coverage over the years. We also offer training and education for the entire workforce, and develop future leaders through a management training program. He graduated from the University of Arizona with bachelor’s degrees in education and business.
Tisha Brackeen works with Arizona G&T Cooperatives management, member cooperative staff, and other customers, assisting with new services, operational issues, and driving program and project initiatives.
Tisha began her career in the Human Resources department as total compensation and benefits manager in 2002. Several years later, she transitioned to support manager for the cooperatives integrated accounting system, SAP, and helped install and implement the software system. In 2011 the SAP department and the IT department merged and Tisha managed that newly integrated group through 2012. These positions focused on organizational and financial analysis, contract administration and process development and improvement.
Prior to joining Arizona G&T Cooperatives, Tisha worked for a New Mexico municipal electric utility. She has a degree in business management.