Joseph Stagner Executive Director Sustainability & Energy Management November 2, 2012

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1 Joseph Stagner Executive Director Sustainability & Energy Management November 2, 2012

2 Energy and Climate Plan - Approach Energy Conservation in Existing Buildings innovatio n Energy Efficiency in New Building Design Energy Supply

3 1. Energy Conservation in Existing Buildings Existing Energy Conservation and Efficiency Initiatives Energy Retrofit Program Whole Building Retrofit Program Energy Conservation Incentive Program Building Operating Strategies Excessive Use Monitoring HVAC Recommisiosning High Efficiency Transformers Room Temperature Storage Stanford saved 240 Million KWH (a full year s consumption), over the last 15 years.

4 2. Energy Efficiency in New Building Design Stanford s building standards Require that new buildings be designed to use at least 30% less energy and 25% less water than standard buildings of the same type. LEED Gold Equivalent Jasper Ridge Field Station Recipient of the AIA/COTE Top Green Projects Award Carnegie Global Ecology Research Center Recipient of the AIA/COTE Top Green Projects Award Jerry Yang and Akiko Yamazaki Environment and Energy (Y2E2) Building

5 CURRENT ENERGY SYSTEM

6 Current Combined Heating & Power System (CHP) Cardinal Cogeneration Plant -50MW CCGT (1987) Third Party Owned & Operated- contract ends in % electricity for university- balance to Grid Steam & Chilled Water distribution to campus Overall trigeneration efficiency ~53% Accounts for 85% of university GHG emissions & uses 25% of fresh water supply

7 Current Combined Heating & Power System (CHP)

8 Electricity

9 Heating

10 Chilled Water

11 kwh electricity/ton-hrs cooling mmbtu steam 350,000,000 Stanford University Energy Demand Forecast 1,400, ,000,000 1,200, ,000,000 1,000, ,000, , ,000, ,000,000 Forecast based on Capital Plan Forecast based on Minimal Growth Scenario 600, ,000 50,000, ,000 Electricity Cooling Heating - -

12 Need for a New Central Energy Facility Support Academic Mission Expansion for Campus and Hospital Growth Successor for Cardinal Cogen (2015) Maintain Economic Viability Increase efficiency innovatio n Protect against gas and water cost increase Lead Sustainability By Example Reduce carbon footprint and water use Create foundation for green energy portfolio

13 NEW ENERGY SYSTEM

14 MMbtu MMbtu MMbtu Discovery of Heat Recovery Potential Current campus chilled water system think of as a system for collecting waste heat, not delivering cold currently collects unwanted heat from buildings and discharges it to the atmosphere via evaporative cooling towers at the CEF At Stanford Heat recovery can be used to capture 70% of this heat for re-use to meet 80% of campus heating needs Stanford University Heat Recovery Potential at Central Energy Facility Sample Date 7/23/2008 Thermal Overlap Cooling Heating Summer Stanford University Heat Recovery Potential at Central Energy Facility Sample Date 4/16/2008 Heating Cooling Hour of Day Stanford University Heat Recovery Potential at Central Energy Facility Sample Date 1/23/2008 Heating Cooling Thermal Overlap Thermal Overlap Spring & Fall Winter Hour of Day Hour of Day

15

16 Discovery of Heat Recovery Potential mmbtu 6000 Stanford University Heat Recovery Potential (2015) Cooling Heating Heat Recovery Potential

17

18 Waste Heat Being Discarded from Cardinal Cogeneration Plant

19 SESI- Combined Heating & Cooling (CHC)

20 NPV (Millions) GHG (million tons); Water (million ccf); Efficiency (1 to 10 scale) Comparison of Options Studied $2,000 Stanford University Central Energy Facility Replacement Options 9.0 $1,700 Steam Options On-site Gas Cogeneration Options On-site PV + Grid Options Hot Water Options Heat Recovery Options Grid Power Options $1,400 $1,256 $1,305 $1,346 $1,355 $1,291 $90 mil capital for onsite gas generation redeployed to PV = 20% of portfolio in 2020 (173 acres) Full required 33% Renewable Portfolio Standard (RPS) in 2020 met with onsite PV (285 acres) $1,217 $1,209 $1,243 $1, $1,100 $800 $500 $435 $549 $579 $546 $546 $566 $474 $ Electricity Natural Gas O&M Capital Water used (ccf) Total GHG $ $ $100 Extend Cogen to 2020, then Grid + Heat Recovery New Cogen (Steam) New Cogen (HW) Gas Power (Turbine) + Heat Recovery Gas Power (IC Engines) + Heat Recovery Grid + 20% Photovoltaic Power + Heat Recovery Grid + 33% Photovoltaic Power + Heat Recovery Grid + Heat Recovery Grid, No Heat Recovery 0.0

21 Benefits Financial & Economic Risk Lowest cost of the options studied (including new cogeneration plant). Savings due to: New higher efficiency equipment Free heat (heat recovery) 10% line loss reduction by converting to Hot Water Long term O&M savings of HW vs Steam distribution Move off 100% reliance on single fuel (gas)

22 metric tons per year Benefits 50% GHG Reduction 300, ,000 Stanford University Greenhouse Gas Emissions (Category I & II) Business As Usual 200, , ,000 50,000 AB-32 SESI Reductions IPCC -

23 Domestic Water use (mgd) Benefits 20% Water Savings 4.00 Stanford University Domestic Water Demand Projections Current water supply limit

24 Benefits Safety & Reliability Boiler Explosion Injures Employee Patient Airlifted To Vanderbilt Medical Center Steam explosion jolts Manhattan, killing 1 More than dozen injured, some seriously; crowds flee steam, flying rubble

25 SESI Schematic Chilled Water CWR (52F to 60F) CWS (40F to 48F) Cold Water Storage Full CEF + GSHE System & Water Loops Ground Water Heat Recovery Chiller Heat Exchanger 60F to 64F 38F to 46F (heat extraction) Hot Water Generator Heat Exchanger 80F to 105F Chiller 70F to 85F Heat Exchanger 60F to 64F Hot Water Storage Cooling Tower 76F to 95F (heat rejection) HWS (150F to 170F) HWR (120F to 140F) Hot Water Condenser Water

26 New SESI Central Energy Facility

27 New SESI Central Energy Facility OSHPD Plant Administrative Offices Work Shops Substation Heat Recovery Chillers Thermal Storage Tanks Cooling Towers

28 Project Components 12% New Hot Water Central Underground Energy Facility Piping and Building conversions 39% Hot Replacement Water Underground Central Energy Piping Facility and Building conversions 49% New Electrical Substation Total Investment $438 Million

29 Enhancements under study Utility scale on-site Photovoltaic power Replaces grid renewables at lower cost (free land and no transmission cost)

30 mmbtu Enhancements under study Ground Source Heat Exchange (GSHE) Augments heat recovery to meet remaining 30% thermal needs Ground Source Heat Exchange Stanford University Heat Recovery Potential (2015) 6000 Also provides additional Groundwater Supply GSHE in lieu of Gas for Heat and Cooling Towers for Chilling 62F 48F Heat Exchanger 56F 42F Chilled Water Loop to/from Campus Heat Recovery Chiller Base SESI Design Hot Water for Buildings 170F 130F Cooling Heating Heat Recovery Potential Potential for Ground Source Heat Exchange Heat Extraction (Winter) Heat Injection (Summer) (not shown) Potential for Ground Source Heat Exchange -6000

31 IMPLEMENTATION

32 Project Components 1. Replacement Central Energy Facility 2. Replacement High-Voltage Substation 3. New Hot Water Distribution System Process steam plant Temporary Heat Exchange Stations 4. Building Conversions

33 Overall Conversion Plan

34 SESI Website

35 Project Timeline Underground Piping June 2012-June 2015 Building Conversions June 2012-June 2015 Central Energy Facility October April 2015

36 Disruption Mitigations Advance notice Multiple shifts/night Work Overlay planned maintenance and capital projects Use existing tunnels and infrastructure where possible Use Logstor prefabricated piping system to reduce trenching requirements

37 Thank You Sustainable.stanford.edu/climate_action

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