Video | Agriculture | Confidence | Economy | Energy | Employment | Finance | Media | Property | RBNZ | Science | SOEs | Tax | Technology | Telecoms | Tourism | Transport | Search

 


Intelligent Solar Roof puts an end to power bills

7 May, 2014

Intelligent Solar Roof puts an end to power bills

The country’s first Zero Energy House has used solar to generate double the electricity it needed over a year, earning the owners a net income [1] for electricity bills.

In 2012, SolarCity supplied the home’s owners Joanna Woods and Shay Brazier with an Intelligent Roof deploying both a photovoltaic and a solar hot water system on their Point Chevalier-based Zero Energy House (ZEH). The home aimed to achieve net-zero energy by generating as much electricity as it consumed, through a blend of energy-efficient features and an Intelligent Solar Roof. Results released today show it exceeded expectations with the award of the international living futures’ certification.

“Two years ago Shay and Jo set out to see if they could build a zero energy house,” says Andrew Booth, CEO of SolarCity. “The home’s performance and energy use was tracked in detail, and over 12 months their solar power system generated more than double the electricity required by the home and delivered a net income to the family of $360 at the end of that year.”

As the price of power continues to rise and the price of solar continues to fall Shay and Jo’s home shows a way forward for the nation’s families.

“Our Zero Energy House protects us from the impact of electricity rate increases while safeguarding the environment,” Shay Brazier says. “The country needs to start thinking about making their roofs more intelligent, and about the cost of running a house per square metre, rather than just the cost of building a house per square metre.

“An Intelligent Roof works for you, rather than sits dormant,” he says. “It uses the free sunshine and turns it into electricity, which can be a huge monthly cost for everyone. There are systems available today that, on a house with this energy profile and feed-in tariff, cost substantially less than the value they would generate over the home’s lifetime.”

To build on the success of the Zero Energy Home, SolarCity is working alongside developers like Maxim in Christchurch, who are building the nation’s largest solar sub-division with 2,200 homes being equipped with solar as standard. Nationally, leading homebuilders Jennian are already pre-wiring homes for solar.

“Our Jennian homes are already ‘solarsmart’ and are pre-wired for solar photovoltaic systems,” says Richard Carver, CEO of Jennian Homes. “Net-zero homes are an important next step to help protect owners from the impact of rising electricity costs while safeguarding the environment for the next generation.”

[1] Net income for electricity bills is calculated by subtracting the payments made to the ZEH owners for exported electricity, less the payments they made to the retailer for imported electricity. It does not include the cost of repayment of the solar system or consider the benefit relative to a house with the same energy usage profile, but without a PV system installed.

Zero Energy House Results
• Amount generated 5,400 kWh.
• Amount used 2,400 kWh.

Economic case for PV system
Economics of PV are based on the value the system generates, and what it costs.

Value is calculated by adding the savings it provided on the electricity bill to the income generated by selling surplus electricity.
• If the PV hadn’t been on the roof the house would have cost $610 to run (based on importing all 2,400 kWh).
• The actual bill was $390. The savings the system provided were then $610 - $390 = $220.
• The income generated by selling surplus electricity was $750. $750 - $390 = $360 profit.
• Total system value was therefore $220 + $750 = $970.

A standard system of the size installed at the ZEH could be purchased for $12,500. Added onto a 25-year mortgage at 6%, annual cost would be ~$970.

Key inputs:
• Fixed daily charge $ 0.259974/day (after prompt payment discount)
• Variable charge $0.218665/kWh (after prompt payment discount)
• Prompt payment discount 22%
• Feed-in tariff $0.17285/kWh
• Amount generated 5,387 kWh.
• Amount used 2,361 kWh.
• Imported 1348 kWh.
• Exported 4341 kWh.

For more go to: www.zeroenergyhouse.co.nz

About SolarCity
SolarCity is the nation's leading solar power company. It is also one of the top five fastest growing Green companies in New Zealand, and is one of the Government’s Focus 500 companies targeted to contribute significant benefits to the New Zealand economy. It is the world’s first solar company to achieve CarboNZero accreditation and is under contract to install 3.4Mw of solar on the nation’s largest solar sub-division. www.solarcity.co.nz

ENDS

© Scoop Media

 
 
 
 
 
Business Headlines | Sci-Tech Headlines

 

Cosmetics & Pollution: Proposal To Ban Microbeads

Cosmetic products containing microbeads will be banned under a proposal announced by the Minister for the Environment today. Marine scientists have been advocating for a ban on the microplastics, which have been found to quickly enter waterways and harm marine life. More>>

ALSO:

NIWA: 2016 New Zealand’s Warmest Year On Record

Annual temperatures were above average (0.51°C to 1.20°C above the annual average) throughout the country, with very few locations observing near average temperatures (within 0.5°C of the annual average) or lower. The year 2016 was the warmest on record for New Zealand, based on NIWA’s seven-station series which begins in 1909. More>>

ALSO:

Farewell 2016: NZ Economy Flies Through 2016's Political Curveballs

Dec. 23 (BusinessDesk) - New Zealand's economy batted away some curly political curveballs of 2016 to end the year on a high note, with its twin planks of a booming construction sector and rampant tourism soon to be joined by a resurgent dairy industry. More>>

ALSO:


NZ Economy: More Growth Than Expected In 3rd Qtr

Dec. 22 (BusinessDesk) - New Zealand's economy grew at a faster pace than expected in the September quarter as a booming construction sector continued to underpin activity, spilling over into related building services, and was bolstered by tourism and transport ... More>>

  • NZ Govt - Solid growth for NZ despite fragile world economy
  • NZ Council of Trade Unions - Government needs to ensure economy raises living standards
  • KiwiRail Goes Deisel: Cans electric trains on partially electrified North Island trunkline

    Dec. 21 (BusinessDesk) – KiwiRail, the state-owned rail and freight operator, said a small fleet of electric trains on New Zealand’s North Island would be phased out over the next two years and replaced with diesel locomotives. More>>

  • KiwiRail - KiwiRail announces fleet decision on North Island line
  • Greens - Ditching electric trains massive step backwards
  • Labour - Bill English turns ‘Think Big’ into ‘Think Backwards’
  • First Union - Train drivers condemn KiwiRail’s return to “dirty diesel”
  • NZ First - KiwiRail Going Backwards for Xmas
  • NIWA: The Year's Top Science Findings

    Since 1972 NIWA has operated a Clean Air Monitoring Station at Baring Head, near Wellington... In June, Baring Head’s carbon dioxide readings officially passed 400 parts per million (ppm), a level last reached more than three million years ago. More>>

    ALSO:

    Get More From Scoop

     
     
     
     
     
     
     
     
    Business
    Search Scoop  
     
     
    Powered by Vodafone
    NZ independent news