community energy independence initiative demonstration project march 14, 2006
TRANSCRIPT
• A City-wide Program that integrates:• Comprehensive energy efficiency• Optimal solar potential of rooftops• Distributed generation where appropriate (e.g.
microturbines, fuel cells)
• Provides greater consumer and City control over costs
• Enhances electric reliability• Reduces greenhouse gas emissions• Achieves Sustainable City Plan goals• Potential to create “Net-Zero” Energy City
What is the Community Energy Independence Initiative?
Solar Potential Analysis –Ensure Roof Compatibility
• Determine roof type (validated with on-site survey)
Examples:
_ Tile
_ Asphalt Shingle
_ Composite
_ Tar and Gravel
Solar Potential –Roof Area Determination
• Measure dimensions of roof from aerial
400 + 2,800 = 3,200 sf
Solar Potential –Roof Area Determination
• Measure dimensions of roof from aerial• Estimate shaded portion (%)
35%
Solar Potential –Roof Area Determination
• Measure dimensions of roof from aerial• Estimate shaded portion (%)• Estimate obstructed area (%)
40%
Solar Potential –Roof Area Determination
• Measure dimensions of roof from aerial• Estimate shaded portion (%)• Estimate obstructed area (%)• Account for roof type
__ Tile
__ Asphalt Shingle
__ Composite
__ Tar and Gravel
Example: 3,200 sf
- 35% - 40% = 800 sf
Solar Study Results• 24 million sq.ft. total usable roof area for
solar• 103 MW capacity potential from solar
photovoltaics• 350,000 sq.ft. of solar thermal for pool
heating and commercial heating needs• Ability to estimate any building’s solar
potential
Solar Survey Results
• Interviewed more than 250 property owners• Considerable support for investing in cost-
effective, integrated energy systems• City should fill the role of program facilitator
Energy Efficiency Potential:• Overall savings of 38% in electricity• Overall savings of 34% in gas consumption
Solar Potential:
Distributed Generation:
CEII Program Potential
• 103 MW peak electric (69% of total peak) 350,000 sq.ft. of solar thermal
• 41 MW of DG electric capacity w/ heat recovery
Citywide Potential for Reduction in Electricity Peak Generation Need
-100
-50
0
50
100
150
200
Baseline with Energy Efficiency with Non-SolarDistributed
Generation (DG)
with Solar
MW
Cap
acit
y
Municipal
Industrial
Commercial
Residential
Potential Export During Peak*
* In this case all electricity is generated within the city on a net basis, which means we will still be using natural gas for distributed generation.
Environmental Benefits of CEII
• Greenhouse gas (CO2) reduction
• Smog (NOX) reduction
• Building Quality Improvements• Reduced need for centralized power
plants
CO2 Emissions Reductions (Stationary Sources)
0
200
400
600800
1,000
1,200
1,400
1,600
Baseline Post-Implementation
CO
2 E
mis
so
ns
, mill
ion
lb/y
r
Electricity
Gas Heat
Economic Benefits of CEII
• Most energy savings remain in community
• Increased property value• Potential job creation• Business retention and attraction
Two-year CEII Demonstration Project
• Install integrated energy systems in 50 residential, commercial, and municipal buildings
• Prepare implementation plan for Community-wide CEII
• Develop website/marketing plan for Community-wide CEII
• Revise City code to facilitate permitting of CEII projects
• Develop business model and financing plan for Community-wide CEII