HEADING TO NET-ZERO BY 2020 Jim Parks EECR&D Manager Energy Efficiency and Customer Research and Development

Background Building America – A Voluntary US Department of Energy Program Goals –60% Reduction in Energy Bill Initially –Target Annual Net-Zero Electricity Use –Use Commercially Available Technologies –Annual Net-Zero Energy Use by 2020

Initial Foray into ZEH Optional PV combined with EE Beazer Powerhouse –5 Subdivisions/18 PV Installs –Entry level –Optional PV –3,300 Watt ac Morrison Homes Lakeside 2003 –12 PV homes out of 90+ homes –Move-up, in-fill project –Spec’d and Optional Upgrade –>30% Title-24, 2 kW ac Solar

A Step Up PV in all homes + EE Premier Homes Premier Gardens –95 units –Entry level, in-fill project –>30% Title-24, 2 kW PV –Standard Feature Treasure Homes –32 units –Entry level, in-fill project –>40% Title-24, 2 kW PV –Standard Feature

Features 40% Better Than 2005 Title-24 Standards MeasureBaseZEH Attic InsulationR-38R-38 Radiant BarrierNoYes Wall InsulationR-13R ” R-4.2 Foam Quality InstallationNoYes Low Air InfiltrationYesYes WindowsVinyl, low U,SHGCVinyl, Low U, SHGC FURN AFUE A/C SEER13 (3.7 ton)14 w/TXV (3.1 ton) ACCA DesignNoYes -- Short Runs Duct TestingNoYes Water Heaterstorage EF.60Tankless EF.82 DistributionStandardPipe insulation Home Energy RatingNoYes Fluorescent LightingYes Yes (All fixtures) Solar ElectricNA2kW AC Solar System

Real Bill Savings – Hitting the Target Solar vs Non Solar Avg Monthly Bills 2007 $0.00 $20.00 $40.00 $60.00 $80.00 $ $ Avg. Mo. Bill Jan, 07Feb, 07March, 07April, 07May, 07June, 07July, 07Aug, 07Sept, 07Oct, 07 Premier Homes NON ZEH AVG BILL Treasure Homes Premier and Treasure Homes Avg monthly electric bills are 58% less than Non- Solar Homes.

Where We’re Headed CPUC and NAPEE goal of net-zero energy home by 2020 Two projects to move toward true net- zero homes: –One Zero Energy Home (80% goal) –Project with PIER/SDG&E/SMUD to build ZEH subdivisions

Current Energy Performance Goals Annual Source Energy: 80% Reduction Zero Net Summer Peak Electric Demand: 4 PM to 8 PM Demonstrate the features of the home to the public and builders (2500 ft2 floor area target)

Base Energy Performance Specs 2x6/R19-R21 cavity/R12 insulating sheathing (R30 wall assembly) R50 12” low-density foam ceiling assembly Tight Envelope,.0002 SLA (4 ACH 50 ), Third Party inspections & testing Low e/low SHGC glazing (0.3 U-value, 0.26 SHGC) 100% CFL/LED Lighting Evaporative Condenser with 15 EER and night ventilation (home); SEER 18/12.5 EER and 10 HSPF mini-split heat pump (apartment) Solar assisted hot water and hydronic heating with 97% efficient gas boiler Tested ducts inside conditioned space Gas clothes dryer and Energy Star dishwasher, clothes washer, and washing machine 3.86 kW AC PV with grid connected battery system Home automation system with energy display, communicating T-stat, lighting controls LEED Platinum Estimated cost increase relative to standard home: +$20.00/ft2

Peak Demand: 4kWac West Array T24 HOF

PIER/SDGE&/SMUD Project Scope of Work almost complete Expect to build two subdivisions – one in San Diego and one in the Sacramento area Homes will contain— –High efficiency windows, insulation, lighting, HVAC, water heating and appliances –Photovoltaic arrays –Demand response enabled –Energy storage (in some cases) –V2G and V2H test

Our Hope Results from these projects will: –be replicable –expand our knowledge –set the stage for the next level ZEH –have nationwide impact