AT-15-C002 — The Path to Achieving Zero Net Energy Homes–Energy Choices, Consumer Costs, and the Environment

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The U.S. Department of Energy (DOE) and the State of California have established aggressive targets for new home energyperformance. DOE’s Building America goal is to reduce energy consumption in new homes by 50% from the 2009 International EnergyConservation Code levels. California’s goal is for all new residential construction in the state to be zero net energy (ZNE) by 2020. Akey strategy to achieve these goals is to use on-site renewable energy to offset purchased electricity and natural gas from the utilities. Offsettinggrid electricity with rooftop solar photovoltaic (PV) generation is a fairly straight-forward concept using net metering, but balancing on-sitePV and direct use of purchased natural gas requires additional study. In this paper, PV capacities necessary to achieve ZNE applied toall-electric and mixed fuel houses are evaluated based on Time-Dependent Valuation (TDV) and site energy metrics. Results of theanalysis using the California TDV methodology show that the direct use of natural gas reduces the size and cost of the PV system requiredto achieve ZNE compared to an all-electric house, while providing similar carbon emission reduction benefits.

Product Details

Published:

2015

Number of Pages:

8

Units of Measure:

Dual

File Size:

1 file , 680 KB

Product Code(s):

D-AT-15-C002

Note:

This product is unavailable in Russia, Belarus