Lori Singleton Manager, Sustainability Initiatives and Technologies September 14, 2010 Maricopa Solar Plant Tessera / Stirling / SRP

209/14/2010L.A. Singleton Tessera Solar / Stirling Energy Systems  Tessera Solar, Independent Global Power Producer, exclusively responsible for the worldwide deployment of the SunCatcher™ Solar Dish  Stirling Energy Systems, Scottsdale-based company, formed in 1996, manufacturer of SunCatcher™ Solar Dish Maricopa Solar Plant

309/14/2010L.A. Singleton Tessera Solar / Stirling Energy Systems  1.5 MW Plant (Maricopa Solar) consists of 60 SunCatcher™ Solar Dishes − 38 ft tall, 40 ft wide, 25 kW, 40 mirrors − Dish concentrator tracks, collects and focuses the sun’s rays to produce heat − Stirling Engine converts thermal energy to electricity Maricopa Solar Plant

409/14/2010L.A. Singleton  Dedication and ribbon cutting ceremony on January 22, 2010  Project provides hands-on access to performance of the technology, grid integration  Local company, economic development, green jobs  Low water use (fraction of acre ft / year)  Project helps establish Arizona as a solar energy leader Maricopa Solar Plant Maricopa Solar Plant Ribbon Cutting & Dedication

509/14/2010L.A. Singleton  Partner with DMB on 40 − 50 acre solar technology demonstration park − DMB would own site − Solar companies would lease location − SRP would purchase energy and RECs  Targeting 3 − 4 projects, 1 MW each  Select new solar technologies past R&D stage, but not yet demonstrated at MW scale in US  Discussions with numerous solar companies DMB Solar Demonstration Park