Proprietary & Confidential © BrightSource Energy, Inc. All rights reserved. 1 January 26, 2011 Nuts and Bolts of Technology: Closer Look at Utility-Scale Solar Power

Proprietary & Confidential © BrightSource Energy, Inc. All rights reserved. 22 BSE Overview Robust Commercial Pipeline & Project Dev.:  2.6GWs of signed PPAs with PG&E and SCE  Ivanpah ~400MW Electric for PG&E and SCE  Bechtel as EPC and Investor  Siemens Turbine/Riley Boiler  $1.37B DOE loan guarantee  ITC cash grant eligible  NRG Energy lead project investor  Shortlisted for a project in Israel  Selected and approved for a project in Crete Proven, Environmentally-Responsible Technology:  Highest temperature and pressure solar steam  Dry-cooling reduces water use  Environmentally-friendly design World Class Team:  Includes the key senior managers of Luz Int’l., which designed & built over 350 MW of solar thermal plants in the 1980’s  Project development team with over 20GW power projects developed, constructed, and managed Successful Pilot and Demonstration Projects:  SEDC Pilot generating ~100% of modeled energy at ~97% availability; exceeded 6MW design point by ~20%  Chevron Demonstration Solar-to-Steam for Enhanced Oil Recovery (EOR) nearly complete (solar field 95% erected, tower erection complete; boiler erection in process, SFINCS control system onsite)

Proprietary & Confidential © BrightSource Energy, Inc. All rights reserved. 3 Luz Power Tower (LPT 550) Technology Boiler Power Block steam water Heliostats

Proprietary & Confidential © BrightSource Energy, Inc. All rights reserved. 4 LPT: Technology to Meet Evolving Performance Needs Solar Capture: Flexible Field & Fine Control Thermal Energy: Multiple Modes High-Performance Versatile Turbine RPS and Reliability Thermal energy is delivered at the precise times and quantities needed in each season through: Optimized Solar Field Layout Fine Control of Tens of Thousands of Heliostats State-of-the-art turbine efficiently provides multiple products: High quantities of energy (& RPS) Reliability services (RA, frequency & voltage support, reactive power, spin, ramping, AGC)= Flexible, high- quality steam + High-performance conventional turbine Dispatchable, Shaped Output + Grid Support / Reliability Services + Maximum RPS (w/o tradeoffs) Inexpensive, high- performance thermal storage High- temperature, high-pressure steam Natural gas augmentation

Proprietary & Confidential © BrightSource Energy, Inc. All rights reserved. 55 Low-impact Design : Fitting the Natural Environment  Plant Design:  Maximizes retention of existing vegetation, land contours & natural features  Solar field does not require concrete foundations, and grading and leveling is extremely limited Mirrors on pylons placed directly in the ground to fit natural contours of area, without need for foundations Vegetation in the solar field will co-exist below the mirrors, trimmed so mirrors can track the sun Soils and vegetation disturbed during construction and operation will be restored

Proprietary & Confidential © BrightSource Energy, Inc. All rights reserved. 66  Water Use: Dry-cooling, Conservation & Closed-loop recycling Low Impact Design – Limited Water Use  Uses air instead of water to condense steam  95% less water use when compared to CSP using traditional wet-cooling  Uses 25 times less water than competing trough technologies  Uses less than 100 acre feet per year; equal to 300 homes worth of water  Closed-loop steam cycle & conservation measures further reduce usage  Efficiency trade-off: Additional costs incurred by using dry-cooling are merited by environmental benefits

Proprietary & Confidential © BrightSource Energy, Inc. All rights reserved. 7 Wet CSP/Conventional Cooling vs. Dry CSP Cooling *Source: California Energy Commission ^Source: Nuclear, Coal and Combined Cycle numbers from World Economic Forum report - Thirsty Energy: Water and Energy in the 21st Century

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