A leap ahead for energy efficient homes in Australia | RenewEconomy

A leap ahead for energy efficient homes in Australia

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How Australia’s widespread adoption of Energy Scores holds important lessons for the U.S. residential housing market.

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Last month REA Group—the global online real estate advertising company and owner of realestate.com.au—launched Energy Scores on its popular real estate platform in partnership with U.S.-based Tendril to provide an instant snapshot of whole home energy performance across more than 80 percent of Australia’s home market.

Based on Tendril’s HomeFit platform, Energy Scores delivers an energy score of 1 to 100 by aggregating both electricity- and gas-related cost and consumption data for single and multifamily properties. Energy Scores also provides details specific to a particular address to help owners better understand total cost of ownership, the estimated value of their home, and relative efficiency compared with other similar homes by size or neighborhood.

Several factors, including consumer demand and competitive advantage, motivated REA and Tendril’s partnership.

“In Australia’s deregulated utility environment, electricity is expensive. In response, homeowners have embraced renewable energy and energy efficiency to lower their bills, but they have lacked the basic information on what performance measures make the most sense for their home, and how these changes will impact overall home operating costs or real estate value,” said Jeff Woodward, business development manager with Tendril. “REA therefore saw a consumer need that it could fulfill with the Energy Scores tool.”

Mounting evidence shows that the economic benefits of improved energy performance are inspiring action among homeowners. Survey results included by realestate.com.au in the Energy Scores media release state that about 79 percent of homeowners were actively trying to conserve as much energy as they could to reduce costs.

Energy Scores’ “claim your home” feature empowers renters and homeowners to capture more energy savings. Renters and homeowners can use the feature to improve their listing’s score on realestate.com.au by adding additional information about their energy usage, habits, and any completed energy upgrade projects for their home.

“Nobody wants a low score,” said Woodward. “It’s positive to see that homeowners are motivated to boost their rankings by making updates that have the biggest bang for the buck, such as attic insulation, which can improve a monthly bill and has a higher return as compared to other renovation projects.”


Signaling increased global momentum toward improved energy transparency in the residential market, REA Group’s announcement follows the release of similar tools on U.S. platforms, including Hotpads (a Zillow Group property which, like others, is working with UtilityScore) and Estately (which recently announced a partnership with Clearly Energy). This market trend is something Rocky Mountain Institute’s (RMI) Residential Energy+ team is following closely as a way to institutionalize energy performance and upgrade value, and make that value visible to consumers.

There are fundamental differences between the Australian and U.S. real estate markets. For example, Australia does not have a multiple listing service (MLS). Real estate agents in Australia also only act as sellers’ agents and don’t represent buyers. Regardless, growing integration of energy performance metrics into property listings indicates where the market is heading. That integration can motivate real estate platforms, homeowners, service providers, and realtors looking to gain competitive advantage and move the market in the “race to transparency.”


Both U.S. and Australian homeowners are equally concerned with the cost and performance of their homes. However, these groups differ in their willingness to do anything about it.

Two-thirds of U.S. homeowners consider home energy performance a top priority, yet almost half of homeowners have done nothing to improve it, and the adoption of energy upgrades in the U.S. is currently increasing at a rate of less than 1 percent per year. Meanwhile, 76 percent of Australian homeowners are worried about growing energy costs, but this concern is, as mentioned above, being channeled into actions that improve home performance (for example, 20–25 percent of Australian homeowners have installed rooftop solar).

Lack of homeowner action in the U.S. can be attributed to several factors. First, there isn’t yet a widely used equivalent to a miles per gallon (mpg) metric for homes for U.S. homes—meaning consumers don’t have easy access to data about a home’s performance or the full cost of homeownership. Also, home energy upgrades don’t have broad appeal in the way they are being marketed and delivered today. Energy upgrades also usually can’t be seen, so they don’t have the same visibility or curb appeal of, say, rooftop PV—although residential service providers have an opportunity to help homeowners better showcase these upgrades.

“Currently, U.S. real estate platforms offering energy scores represent a small fraction of the market,” said Rachel Gold of RMI’s Residential Energy+ team. “This shows great leadership by early movers, but also leaves a large market gap for a big player to step in and provide the home energy performance data that America’s 83 million homeowners need to make informed decisions and gain significant competitive advantage—as evidenced by the scale and positive outcomes achieved by REA.”


REA and Tendril point out that consumers in Australia were the driving force in the successful release of Energy Scores. But additional influences on consumer decisions can help homeowners channel heightened awareness into action.

In the U.S., realtors, contractors, and installers looking for a competitive edge can play an equally powerful role in promoting the benefits and transparency of home performance to influence a customer’s decision in the absence of a widespread energy score for homes, as detailed in RMI’s newly released Peer Diffusion report. One way this can be achieved—notes the report—is for service providers to communicate with homeowners that better-performing homes are simply better homes.

“A home energy score, while providing an at-a-glance rating for overall efficiency and carbon footprint, is also a description of the performance and comfort within a home. This comfort and performance comes from quality construction practices that reduce the inherent symptoms of shoddy construction, like air infiltration, noisy equipment, leaky ducts, cold floors, the list goes on,” said Steev Wilson, owner of Forum Phi Architecture, an award-winning firm based in Colorado. “I believe that as scores become more prevalent, they will not only be valued as a means to identify energy efficient buildings, but will become a measure of the quality of the product being purchased and gauge the expectation for the quality of life and health that product is associated with.”


As leaders like REA, Tendril, and others offer new solutions that provide the transparency needed in the market to inform demand among homebuyers for greater energy performance—including the options available for energy upgrades—the scales will continue to tip in the direction of both improved supply of and demand for home energy upgrades as a means to boost property value, comfort, air quality, and monthly cost savings.

Australia lights the way for North American real estate businesses, which have yet to live up to the promise of sharing this critical information with consumers.

“It’s only a matter of time until smarter, more efficient homes are the sought-after standard because comfort and performance are marketable as earmarks of a luxury product,” said Wilson. “I look forward to homes having a metric for evaluating these qualities and giving them value in the marketplace.”

Meanwhile—homeowners take note. Home energy upgrades and whole home performance won’t be invisible for long.

Source: RMI OUTLET. Reproduced with permission.

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  1. Vicki Stevens 3 years ago

    Well done REA, as a sustainable building consultant, I quite often ask RE agents at open houses what the energy efficiency rating is, they never have any idea, even in new homes that should have certificates to prove they are the mandatory (but unfortunately, not enforced) 6 star energy rated.
    The information your provide is vital, and will push demand for more sustainable, energy efficient homes as home buyers and investors seek out homes with low running costs – a big plus for the environment and health of the planet. Thankyou !!

    • juxx0r 3 years ago

      Unfortunately the 6 stars are rubbish, you can have a 6 star house and still need a 15hp airconditioner bolted to it. Or the 6 star house i lived next door to that had 8 split systems hanging off it.

      • Vicki Stevens 3 years ago

        Unfortunately I agree, there is no accountability, no governance, and builders see 6 stars as just having to insulate the building envelope (which cowboy builders just don’t do properly), adding a very small water tank and a few led’s as there is no incentive for them to do any better because it just isn’t monitored. If energy rating certificates were mandatory at handover and issued by suitably trained inspectors, as well as a requirement for an updated certificate for re-sales, we might make headway into properly built, energy efficient, durable homes. As with most aspects of society – money talks, so while ever big property developers can pay / bribe authorities and inspectors, crap continues to be built.
        It is in the hands of real estate agents to promote energy efficiency as a key selling point – we all want to maintain our homes at minimal cost, and this will drive demand.
        I’m playing my part to influence better building practices – it’s a hard slog when most people assume an energy efficient building costs more to build, but demand is growing as more people are educated to all the benefits of going green – which is much more than just solar panels on the roof.

        • solarguy 3 years ago

          Keep up the good fight Vicki girl, things have to change. It has long been a thorn in my side how the industry gets away with making energy inefficient shit boxes.

      • solarguy 3 years ago

        Your right about the rating being rubbish as it doesn’t account for poor orientation either, even if the build is good. Keep the sun out in the warm and hot months, but allow it in the cooler months goes along way to making it efficient.

        Think about the house next door 8 split systems. 1) they didn’t use them all at the same time I’m sure. 2) they were there when and if needed. 3) I have 4 splits at my place and when on hot days over 38c and it’s sunny all are going as my solar does the work, even though if I didn’t have solar cheaper than ducted to run, which never gets used anymore.

  2. George Darroch 3 years ago

    If this merely aggregates data on recent use then scores might tell you more about the last tenant – who had long showers, owned a plasma TV, and put everything in the drier – than it does about the house itself.

    • Rod 3 years ago

      Yes, a lot of energy efficiency comes from Attitudes and Actions.
      If a homeowner or tenant has no real desire to use less energy it matters less how efficient the property is.
      The actions are things like opening windows to provide natural ventilation, using external blinds in Summer, opening blinds and curtains in Winter, using fans instead of AC etc. and as you say how they use their appliances.

    • solarguy 3 years ago

      Damn good point George. But I dare say it will be on how much it takes to heat or cool the place. Well at least it should be.

  3. john 3 years ago

    I did Architecture studies in the early 70’s.
    At that time i went and interviewed builders and developers.
    They did not care about energy efficiency.
    In the years from there I have watched the pathetic types of housing being erected with black roofs no ventilation no thought about using prevailing breezes let alone the heat load from the sun.
    We have now a stock of very poor built building which would suit North America, after all that is where the plans come from and are for heat gain not heat mitigation.
    I do not see this changing anytime soon due the very poor knowledge within the general community.

    • solarguy 3 years ago

      What your saying John certainly isn’t news to me, my wife works for a building company how also don’t have clue and don’t seem to give a shit either.

  4. Tim Forcey 3 years ago

    Hopefully some of our members at “My Efficient Electric Home” will try this thing out… https://www.facebook.com/groups/996387660405677/

  5. solarguy 3 years ago

    Wow, that means my place would get a score of close to zero MPG.

  6. Greg Hudson 3 years ago

    As soon as I read about this, I went on the the REA website (realestate.com.au) and saw that the score for my current house (that I have just sold) was a mere 11 out of 100. After updating their data with the actual building features that I have added (like solar panels, LED lighting, a 5 star rated brand new refrigerator, all new energy efficient appliances, double glazing, insulated floor, R6 rated ceiling insulation) and a bunch of other stuff, my rating jumped to 86/100. Quite an improvement. Unfortunately it doesn’t really help me, as I have just sold this ‘efficient’ house, and am moving into a ‘6 star rated’ brand new house – even though it has no solar or double glazing. How this 6 star (Govt required) rating was achieved, I am yet to find out (the builder, who lives behind has not provided any certificates). The new house was undervalued by $150k according to similar sales in the area, so we will be flipping it ASAP, but as part of the ‘experiment, I am *NOT* going to do any upgrades this time. I have a feeling my wife is going to get bill shock once the first power bill comes in. The only heating and cooling comes via a 14Kw energy sucking monster ducted aircon in the ceiling. I am dreading the expenses myself too, but what can I do. This is the house she fell in love with (well for the moment at least). Mind you, she has already been on REA looking for the next one, and we have not even moved in yet ! I have already booked a real estate agent to sell it on 1st March 2018 (I can’t sell it sooner, because we have to live in it for 12 months, or we pay capital gains tax – which I don’t want to do.)

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