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Renewable Energy
Up to 25 points are available for offsetting energy use with on-site renewable energy generation. One point will be awarded for every 4 % offset.
To calculate the total home energy use( including both annual energy use and miscellaneous electrical loads), perform the following tasks:
� Calculate the miscellaneous electrical loads( plugs and outlets) using the GreenPoint Near / Net Zero calculator.
� Compile the non-Time Dependent Valuation( TDV) annual energy consumption, using Title 24 compliance software reports.
� If necessary, convert the energy consumption figures to kBtus per year. For information on source energy conversions, see the U. S. Energy Information Administration’“ Energy Units and Calculators Explained” page.
� Add the miscellaneous electrical loads and the non-TDV annual energy consumption, in kBtu. This number represents the total estimated energy use.
� Calculate the contributions of the on-site renewable energy sources, in kBtus. Perform the calculations as follows:
– Photovoltaics: Use calculations from the New Solar Homes Partnership Calculator, or another CEC-approved calculation method.
– Solar water: Use calculations from the solar water F-chart( available through the Go
Solar California web site), or another jurisdiction-approved calculation method. – Wind: Use a jurisdiction-approved calculation method. – Micro-hydro: Use a jurisdiction-approved calculation method. – Other: Use a jurisdiction-approved calculation method.
� Divide the total contributions of the renewable energy sources by the total estimated energy use. This percentage is the renewable contribution of the project, and is the basis for the number of points awarded.
VERIFICATION
Field Verification: The Rater may conduct field compliance verifications to confirm systems and specifications identified in the documentation listed below.
Documentation: The Rater will collect the following:
INTENT
DRAFT
� Copies of energy compliance reports.
� An estimate of renewable energy production using the documents identified in the Criteria for Qualification section of this measure, the percentage of renewable contribution, and a supporting narrative from the builder or another appropriate expert. The contractor must supply a copy of the CF-6R-PV solar report( or other appropriate forms) based on what was actually built( that is, the system size, output, and percentage of load served by the photovoltaic system). If a Home Energy Rating System( HERS) Rater is completing the inspection, he or she will provide the CF-4R-PV after installation.
� Calculations of home energy use and offset.
To conserve fossil fuels used for energy generation. To reduce air and water pollution. TO reduce pressure on the electrical grid and natural gas sources by using on-site renewable sources.
DRAFT GreenPoint Rated New Home Rating Manual Version 6.0, September 2013 61 © Build It Green