1. CDAWG November 13, Ivanpah Solar Project: Helping to meet California’s Climate Change Goals by Shankara Babu, ESH Manager, NRG O&M Doug Davis, Senior Compliance Manager, BSE

2. Corporate Organization
Solar Partners Holdco, LLC - Equity Investors
NRG
Google
BrightSource
Three Individual Projects
Solar Partners II – Ivanpah #1. Selling power to PG&E.
Solar Partners I – Ivanpah #2. Selling power to SCE.
Solar Partners VIII – Ivanpah #3. Selling power to PG&E.
Southern California Edison Transmission Upgrade
Implementing their El Dorado to Ivanpah Transmission Project (EITP)

3. CSP - Technologies Linear Fresnel Reflectors Parabolic troughs
Parabolic dishes
Central Receiver / Heliostats

4. Energy from Sun
Insolation is a measure of solar radiation energy received on a given surface area and recorded during a given time.
Direct insolation is the solar irradiance measured at a given location on Earth, excluding atmospheric diffused insolation.
Absorbed solar radiation is converted to thermal energy, causing an increase in the object's temperature.

5. Overview

6. Power Block Configuration
SOLAR RECEIVER STEAM GENERATOR (RILEY POWER)
Concentrated sunlight converts water in a boiler to high-temperature steam.
OPTIMIZATION / CONTROL SOFTWARE (BRIGHTSOURCE)
Solar Field Integrated Control System is the proprietary optimization software to manage heliostat positioning and optimize concentrated sunlight on the boiler.
AIR-COOLED CONDENSER (SPX)
Environmentally friendly in design, using 95% less water than competitive technologies.
TURBINE (SIEMENS)
Steam powers turbine to produce electricity – then is converted back to water through an air-cooled condenser.
HELIOSTATS (BRIGHTSOURCE)
Software-controlled field of mirrors concentrate sunlight on a boiler mounted on a central tower.

7. Overview

8. Site Geography and Footprint Tower Project, about 3600 acres
Edge of U1 SF to edge of U3 SF = 5 miles
Unit 1 to Unit 3 Tower = 3.2 miles
Tower
Height 459” steel structure with the boiler on top
Tuned Mass Damper

9. Solar Steam Generator Boiler Controls 2646 psig / 1054 F Evaporator
Super Heater
Reheat
Controls
IR Cameras – 2/wall, total 8
Heat Flux Sensors – 24 pairs of TCs embedded in SH, RH, and EVA tubes.
About 1180 loops, 120 MOVs (networked), 17 CVs
100% steam bypass, no sky valves

10. Solar Steam Generator Layout
Superheat
Protection Panels
Evaporator
Reheat

11. Steam Turbine Generator
Siemens SST-900
HP and IP Turbine
HP – 7200 RPM
IP – 3600 RPM
Generator
135 MVA
3600 RPM
Design
Fast Startup
Daily Cycling

12. Air Cooled Condenser ACC
Water Consumption limited to 100 acre-ft / year
3 Streets of 5 fans / Unit
2 Speed

13. Solar Field 18

14. System Components Overview: Focal Length
Focus length too long
Heliostat focused on SRSG
Focus length too short

15. System Components: Heliostat
 LH-2.2 Heliostat
 Mirrors
 Metal support structure  Dual-axis drives
 Heliostat controller
 Focuses sun on SRSG
 Under SFINCS control

16. Solar Field Control System (SFINCS)
Heliostat desired aiming points calculating to:
Flux vs Load balancing
Implement quick flux reduction / defocusing
Measuring SRSG skin temperature
Alert on crossing temperature limits

17. Solar Field Control System (SFINCS)
Inputs:
Heliostat calibration data, heliostat reflectivity
Weather data
Skin temperature of panels
SFINCS state, operation mode and sensor info
DCS SP & control parameters
Outputs:
HAPA (Heliostat Aiming Point Array): a collection of aiming points (1/heliostat), sent to SF through SFC
Is there potential flux for operation?
Is tracking active (per SRSG section)?
Process information, flux and temperature maps
Alarms on flux / temperature deviation

18. Weather System Insolation Matr
East Weather Statio Tower Weather Statio Insolation Weather Statio West Weather Statio

19. General Description  Weather Station Measurements  Radiation  Wind
 Direct Normal Radiation (DNR) - Critical for optimizing performance  Global Horizontal (GH) radiation
 Diffused Horizontal (DH) radiation  UV horizontal radiation
 Wind
 Wind speed in different locations - Critical for SF safety during high winds  Wind direction
 Ambient weather
 Ambient temperature  Relative humidity  Barometric pressure  Rainfall

20. Instrumentation

21. California Renewables Portfolio Standards [RPS]
Under California's Renewables Portfolio Standard (RPS) statutes, all sellers of electricity in California, including publicly owned utilities (POUs), investor-owned utilities (IOUs), electricity service providers (ESPs), and community choice aggregators (CCAs), are required to procure a portion of their electricity retail sales from eligible renewable resources to meet the following goals:
20 percent by the end of 2013
25 percent by the end of 2016
33 percent by the end of 2020

22. Environmental Considerations
Flora and fauna – Protected Species
Desert Tortoises
Succulent Desert Plants
Weed Management
Water acre-ft/year
2 – onsite wells provide all the water
Air – Emissions
Title V
GHS/cap and trade
Avian and Bat - nesting and migratory birds
Surveys
Monitoring
Reports

23. Ivanpah Stats
7.8 Million man-hours worked without a lost time accident
2600 employees at the peak of construction
70 O&M employees post construction
2.3 Billion
3 units generating 373 MW
Will power 140K homes

24. Questions?