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Understanding Zero Net Energy Homes: Definitions, Benefits, and Financial Models

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This document provides an in-depth analysis of Zero Net Energy (ZNE) homes, emphasizing their efficiency and sustainability. It explores California's policy landscape, including AB 32 and Title 24, which set stringent energy goals. Key distinctions are made regarding what ZNE homes are not, such as not being entirely off the grid or fossil fuel-free. Cost-effectiveness is analyzed, demonstrating that energy efficiency and renewable energy can result in positive cash flow from day one. The text also addresses affordability and financial models for incorporating ZNE in housing development.

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Understanding Zero Net Energy Homes: Definitions, Benefits, and Financial Models

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  1. Zero Net Energy Homes: Background and Definitions Ted Bardacke Nueva Vista, Santa Cruz Colorado Court, Santa Monica

  2. Policy/Regulatory Landscape • AB 32 - Buildings are high priority and seen as high opportunity • Title-24 Energy Code - 15% more stringent every 3 years • California Energy Commission - Recommended 2020 goal • Public Utilities Commission - First goal of long-term strategic plan for 2020

  3. What Zero Energy is Not? • Not Off the Grid - Utilizes net metering • Not Fossil Fuel-Free - Still might have natural gas or “dirty” electricity • Not Carbon Neutral - emissions still dramatically reduced

  4. What is a Zero Net Energy Home? Greatly reduced needs for energy through efficiency gains, with the balance of energy needs supplied by renewable technologies.

  5. What is “Cost Effective?” • Net cash positive from day one when first costs for energy efficiency and renewables are folded into mortgage. • Annual utility bill savings are greater than the additional monthly mortgage payment needed to pay for energy efficiency and renewable components

  6. Cost Effective?

  7. Cost Effective? ($22k) With Tax Benefit Without Tax Benefit

  8. Cost Effective? ($32k) With Tax Benefit Without Tax Benefit

  9. Affordability • Affordable/subsidized mortgage products will need to adapt to look at true “housing burden” including utilities • Affordable rental housing business model, utilizing low income housing tax credits, exists and is being utilized.

  10. 3 : 1 Density 1 : 1 2 : 1

  11. Density • Near-site option -- adjacent, contiguous, or within a limited radius • Working on additional mechanisms to ensure that policy does not induce sprawl • Want to recognize environmental, GHG, and livability benefits of compact development

  12. Financial Models • Single Family = Incorporate into Mortgage • Reduced utility bills more than offset increased mortgage costs • Condos = Power Purchase Agreements • HOA turns into a power-purchase co-op • Affordable Housing/REITs = Incorporate into Deal • Developer buys/owns system and gets payback

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