San Francisco Uses Solar Energy to Offset GHGs Associated with Wastewater Treatment Plant

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CITY AND COUNTY OF SAN FRANCISCO

• San Francisco Uses Solar Energy to Offset GHGs
  Associated with Wastewater Treatment Plant

Laura Spanjian Assistant General Manager,
External Affairs San Francisco Public Utilities
Commission USCM Water Summit - November 19, 2008
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Mission and Vision

• To provide our customers high quality and
  reliable water, power, and wastewater services in
  a manner that is efficient and inclusive of
  environmental and community interests.
• The San Francisco Public Utilities Commission
  strives to be the utility leader in service,
  sustainability and innovation with results.

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WATER Enterprise
System Overview

• SFPUC provides an average 265 million gallons of
  water per day to 2.4 million San Franciscans and
  wholesale customers
• 167-mile water delivery system from Hetch Hetchy
  in Yosemite National Park to San Francisco

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WASTEWATER Enterprise Vision

• A sustainable system a green city
• Public health protection
• Reliable wastewater collection and treatment at
  all three plants
• Clean environment
• Clean neighborhoods

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Sustainable Wastewater System

• Low Impact Development (LID)
• Maximize Renewable Energy Opportunities
• Water Reuse
• Biosolids Reuse/Disposal
• Biofuel SFGreasecycle a model for other cities

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POWER Enterprise Goals

• Reliable
• Greener
• Lowest Net Cost
• Control
• Energy Efficiency
• Self-Sustaining
• SFPUC Power Enterprise serves approx 20 percent
  of San Franciscos energy demand

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Renewable Power Projects

• Expanded Solar Power, with emphasis on
  large-scale solar projects
• Cruise Ship Shoreside Power Services
• Geothermal potential in watershed lands
• Tidal Power
• Green Communities in Redevelopment Areas
• Community Choice Aggregation

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Summary of San Francisco Solar Projects

• The SFPUC currently operates over 2MW of
  photovoltaic projects located throughout San
  Francisco with another 5 MW to be completed in
  2009.
• These projects utilize a variety of photovoltaic
  technologies.
• Funded by Sustainable Energy Account, derived
  from SFPUC Power revenues
• CREBS
• Power Purchase Agreements
• Design-Build construction

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Location of Solar Projects
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San Francisco Solar Resource
San Francisco has a good and consistent solar
resource
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Design Summary
Project Size (KWp) Solar Technology Cost () Millions Construction Duration (months) Date in Service
Moscone Convention Ctr 675 Sanyo 175 / Siemens SP75 4.7 17 October 2003
Southeast Treatment Plant 255 Sanyo 190 1.9 11 October 2005
Pier 96 245 Kyocera 190 2.3 10 January 2007
CDD Yard 134 Open Energy SP480 1 12 December 2007
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Design Summary, contd
Project Size (KWp) Solar Technology Cost () Millions Construction Duration (months) Date in Service
North Point Treatment Plant 241 Sharp 180 2 12 December 2007
Maxine Hall 32 Solar World 175 0.35 10 December 2007
China Town 10 Solar World 175 0.15 11 December 2007
SFO 492 SunTech 175 5.5 14 February 2008
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SF International Airport
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Moscone Center
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Pier 96
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SoutheastWater Treatment Plant
High Efficiency Sanyo 190W Photovoltaic Solar
Panels
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North PointWater Treatment Plant
Sharp 180 Wp Solar Photovoltaic Panels
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Energy Generation

• In total, these projects have generated over 4
  million kilo-watt-hours of clean renewable
  electricity for the City of San Francisco.
• They have met 99 of the energy expectation

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Funding CREBS

• Clean Renewable Energy Bonds (CREBS)
• Provides zero interest financing for renewable
  energy projects under federal IRS program
• Benefits the City by providing early capital
  which can then be used to construct additional
  projects.

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Future Municipal Facility Projects

• Chinatown Public Health Center (26
  kWp)
• Muni Woods Motor Coach Facility (104 kWp)
• Muni Ways and Structures Facility (127 kWp)
• City Hall (200 kWp)
• Davies Symphony Hall (200 kWp)

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Funding PPA forLarge Scale Solar

• 5 MW at Sunset Reservoir in SF
• RFP issued April 2008
• Bid awarded to Recurrent Energy
• 25 year term with buyout option after 7 years
• PPA will take advantage of 30 federal tax credit
• Congress Extended Tax Credits for 8 years

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Artist Rendering of Sunset Reservoir
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Future Large Scale Solar Projects

• SFPUC Facilities
• Reservoirs 15.3 MW
• Municipal facilities 5.0 MW
• Sunol open land 25.0 MW
• Tesla open land 5.0 MW

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GoSolarSF
GoSolarSF Program Highlights

• Incentive program to encourage more solar
  installations for residences and business
• Coupled with Federal tax incentives and the
  California rebate program (California Solar
  Initiative), can pay up to half the cost

• 25,000 is average installation cost
• Incentives for residences range from 3,000 to
  6,000, and up to 10,000 for businesses
• Additional incentive of 5,000 available to low
  income households

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Energy Efficiency Projects at SFPUC Wastewater

• Energy-Efficient Lighting Retrofit Phase 1
• Replace lamps and ballasts in approximately 1200
  fixtures containing T12 fluorescent lamps with
  high output T8 fluorescent lamps at Southeast,
  North Point and Oceanside Plants
• Better lighting quality
• Projected savings of 250,000 kWh/year
• Demand reduction of 49 kW

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Southeast Plant Aeration Basin Mixer Project

• Plant replaced 48 aeration mixers and upgraded a
  series of electric motors
• Energy savings of 1,500,000 kWh/year
• Demand reduction of 156kW peak

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Southeast Plant Aeration Basin Mixer
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Future Projects

• Energy-Efficient Lighting Retrofit Phase 2
• Replace inefficient lighting fixtures, lamps,
  ballasts, and controls with new energy efficient
  technologies across Wastewater Enterprise
• Projected savings of 750,000 kWh/year
• Demand reduction of 41 kW

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Cogeneration at SFPUC Wastewater

• Southeast Plant
• Cogeneration plant currently in the process of
  being retrofitted
• Gas Handling Project designed to improve quality
  of digester gas
• Plant will produce 1700 kW, approximately 55 of
  total facility load
• Project estimated to be complete in 2009

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Cogeneration at SFPUC Wastewater

• Oceanside Plant
• Currently has two 550 kW internal combustion
  engines
• Typically one engine runs, 95 of time
• Augmented with natural gas
• Plant output over 1/3 of total facility load

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Energy Usage/Offsets for Wastewater Treatment
PlantsSeptember 2007-August 2008

• Southeast Treatment Plant (Avg Demand 3100 kW)
• Solar Offset Approx 1
• Cogeneration Approx 55 (2009)
• Northpoint Treatment Plant (Avg Demand 55 kW)
• Solar Offset Approx 57
• Oceanside Treatment Plant (Avg Demand 1400 kW)
• Cogeneration Approx 38
• Energy Efficiency Demand Reduction for 3 plants
• 2 currently
• Another 0.6 in 2009

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CIVIC CENTER SUSTAINABLE DISTRICT

• In partnership with
• City departments
• Local agencies
• Community groups
• Businesses
• create a Civic Center Sustainable District

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CIVIC CENTER SUSTAINABLE DISTRICT

• District Sustainability Goals
• Reduce energy demand by 33
• Meet 35 peak energy power demand with renewable
  sources (solar and wind)
• Decrease potable water demand by 80
• Lessen wastewater treatment capacities by 45
• Reduce carbon footprint by 2,480 tons, equivalent
  to 1,433 SF households/year

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CIVIC CENTER SUSTAINABLE DISTRICT

• The District
• Showcase of green and sustainable practices
• Blueprint for urban redesign using a community
  approach to development
• Destination

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• Artist rendering of example concepts

RETHINKING CIVIC CENTER
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For More Information

• www.sfwater.org
• Laura Spanjian
• Assistant General Manager, External Affairs
• San Francisco Public Utilities Commission
• 1155 Market Street, San Francisco, CA 94103
• 415-554-1540