Categories: Solar

LA city raises rooftop solar mandate, requires “zero net energy” homes

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CleanTechnica
Lancaster, California, is located northeast of Los Angeles near Edwards Air Force Base. It lies at the edge of the Mojave Desert, where abundant sunshine is the order of the day. The city has been a leader in clean, renewable energy since 2011 and has been requiring builders to install solar panels on all new homes since 2014. Its policies have served as a model for other California communities, including SebastopolSanta Monica, and San Francisco. Now, the city seeks to raise the bar by requiring each new home to have a rooftop solar system large enough to meet its full energy needs.

First, a disclaimer: The new requirement for rooftop solar is computed based on the square footage of the home. How much electricity each family actually consumes will vary widely. Couple A may have an in-ground pool, a hot tub, and two Teslas. Their energy usage will naturally be higher than Couple B, who have none of those things. Lancaster’s “Zero Net Energy” policy, passed last week, mandates that rooftop solar systems generate 2 watts per square foot of living space.
“The Zero Net Energy Home Ordinance expands upon Lancaster’s residential solar ordinance so that new homes built in Lancaster now will not only be environmentally friendly, but have a zero net impact on our environment, while reducing energy costs for the homeowners,” said Republican Mayor R. Rex Parris in a statement. “This is a great stride in Lancaster’s journey to become a Zero Net City.”
The implementation of the new rooftop solar policy must wait for a feasibility study to be concluded. That is expected to happen in April. Then, Lancaster will seek approval from the California Energy Commission. If everything goes smoothly, the rule will take effect before the close of 2017. One of the advantages for homeowners is that the cost of the solar system is included in the price of the home. That means the extra cost of the system only increases the monthly mortgage payment slightly. In addition, it eliminates the homeowner having a separate loan to pay in addition to the mortgage each month.
An analogy could be made to a heating and air conditioning equipment. Adding those items into the purchase price of the home just makes sense. Also, contractors are accustomed to dealing with suppliers and subcontractors. Letting professionals deal with those details rather than making individual homeowners research the best combination of equipment, warranty, and price is only sensible.
The new policy is in line with legislation filed just last week in the California legislaturethat would mandate 50% of the electricity used in the state come from renewable sources by 2025 and 100% by 2045. The Lancaster policy may serve as a model for other communities in the state as they devise ways to meet those goals.
By the way, Lancaster is also where BYD builds its electric buses for the USA.
Source: CleanTechnica. Reproduced with permission. 

This post was published on March 3, 2017 1:10 pm

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  • No big deal. A home of 120m^2 would only need 2.5kW of PV. Now if they only were to specify good insulation plus perhaps a usable 10kWh of storage then that would really take a load of the local grid.

      • 1m^2 =10.7639 ft^2. For a 120m^2 home at 2W/ft^2 results in 2583.34 W. My estimate was 3% low, yours is 60% high.

        • Umm, 30cm = 1ft, 100cm/30cm=3.33sqft x 2 watts=6.66w per sqm x 120 sqm=799.99 watts. So I think we were both wrong.

          • Ok, according to online conversion table there is 3.28ft in a metre, so to get 1 sqm x 2=6.56ft x that by 2 watts=13.12watts per sqm. So 13.12 watts per sq x 120sqm=15.744kw. I think we on to something here. If not I will I will have another drink and enjoy what little time I have left before my brain says WGAF.

          • According to "the US Census Bureau reports that the average size of a new single family house in 2015 was 2,687 square feet (249.6m²)" according to ComSec Economics | October 31 2016 report. A tad more than the 120m2 assumed.

          • I assumed nothing and neither did the other guy. 120sqm was plucked from the air as an example, that's all.

        • Further calc shows you were correct. But I don't think 2.58kw would be enough unless they mandate SHW as well. I would like to see 4kw.
          A good start though!

  • Brilliant, we need to do the same here, plus all new housing estates and the blocks on them designed to allow correct north orientation of homes. And those homes to maximize north roof area for PV and SHW collectors. Passive solar design principles as well and beefed up insulation. Oh and 14kwh of battery storage minimum!

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