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Revolutionising the energy network, one LED light at a time

Could something as simple as switching to LED lighting help to drive the transition to renewables?

Sydney electricity distributor Ausgrid says it can, receiving $1 million from ARENA to work with households and businesses to become more energy efficient and install solar panels.

ARENA’s funding will expand the Power2U program to 15 suburbs across Sydney, including Bankstown, Alexandria, Glebe and Pyrmont. The City of Sydney is chipping in an additional $750,000, bringing the project’s total budget to $3.5 million.

The project falls under ARENA’s work to improve energy productivity – an investment priority that aims to support projects that manage demand as the transition to renewables accelerates.

Targeting people in the community that have been slow to adopt renewables and are hard to reach, the program aims to reduce the need to replace ageing electricity infrastructure. This will be achieved by lowering demand on the grid, with a particular focus on permanently curbing energy use during the day.

What kind of impact can efficient devices and LED lights have, in conjunction with rooftop solar panels?

Ausgrid CEO Richard Gross says Power2U will help to reduce energy use, while making the grid more sustainable and providing hip pocket relief.

“Our network has the second lowest rate of solar take-up by customers due to the high number of apartments and businesses in our footprint,” Gross said.

“This project could realise a solution that would possibly increase the number of solar installations on apartment buildings and leased commercial properties.”

Ausgrid will install rooftop solar panels as part of the Power2U program

For a growing country like Australia, there are a spectrum of opportunities to make better use of the energy we generate. Global energy transition experts the International Energy Agency say the importance of improving efficiency cannot be underestimated – they believe it will be a vital element of the transition to renewables, if we have any hope of meeting global emission reduction targets.

The numbers show how important it will be to do more with less across the energy network. Data from Australia’s Bureau of Statistics shows that our population has grown by 3.75 million people in the last decade, and we are the only country in the developed world to have enjoyed uninterrupted economic growth for 27 consecutive years.

Despite the rising population and increased reliance on digital technology, Australia’s energy demand has been in decline since 2009.

The Australian Energy Market Operator’s March forecast predicts that demand is likely to remain relatively flat for the next twenty years. Despite our growing population, AEMO expect that residential demand will actually fall, thanks largely to new energy efficient appliances and rooftop solar.

The story is similar with energy demand from business. AEMO predict this will also remain flat, partly because of advances in energy efficiency, but also due to weakening demand for energy from the manufacturing sector.

How does this help with the transition to renewables? Reducing demand by enhancing productively will help to make the switch an energy system underpinned by renewables cheaper, easier and faster. In practice, using energy more efficiently could allow investments in expensive and unnecessary infrastructure to be delayed, or avoided altogether. Using energy more wisely could reduce peaks in demand, smoothing usage across the day.

One home shifting to efficient light globes won’t make a noticeable difference at a network scale, but everybody working together across a city or state can put a dent in demand, particularly when efficiency measures are partnered with solar panels. Reductions in demand for grid electricity as a result of the growth of rooftop solar are already apparent, according to AEMO.


ARENA CEO Darren Miller said the scheme will show the potential for efficiency technology to be combined with renewables to reduce energy costs and reduce load on network infrastructure.

“The project will provide Ausgrid and other distribution network service providers around Australia greater confidence in the ability of renewable and efficiency solutions to offset network expenditure, which has traditionally been very difficult to address with demand management.

“Ausgrid’s program will encourage greater uptake of low emission technologies and solutions, reduce energy costs for participating consumers and reduce demand on Sydney’s grid,” he said.

Schools set to shine with solar in 2019

In the Northern Territory, schools look to be set for a renewable energy revolution when they go back this year.

Last month, the Northern Territory Government embarked on a $5 million project to put solar PV on up to 25 schools, which is expected to cut energy bills by as much as 40 per cent.

Solar PV installed on a school building

Schools are ideally suited to solar energy, as their energy usage is highest during school hours during the day when the sun is shining. Unlike households where demand spikes as people get home in the evenings, demand for energy in schools drops off when class finishes in the afternoon.

The first round of the program has already allocated $1.5 million to kick off the planning process at the first ten schools. Eight are expected to be completed by the end of the financial year, with a further six scheduled for the second round in 2019/2020 and five more in 2020/2021.

The schools have been selected based on their energy consumption, with priority given to the highest users. Government primary and secondary schools are among the 19 included in the initial announcement.

The $5 million solar schools program is part of the government’s Roadmap to Renewables plan.

Making the announcement, Territory Minister for Renewables and Essential Services Dale Wakefield said the government is working towards a power system with more solar and less gas.

But it isn’t expected to be all plain sailing. In late 2018 ARENA hosted an A-Lab in Alice Springs to workshop ways to accommodate all the incoming renewable energy into a grid that is already straining with just eight per cent renewable penetration.

Themed “small enough to manage, big enough to matter”, Alice Springs was identified as a test case to overcome challenges facing the National Electricity Market  as more distributed energy and more renewables come online in the grid.


Territorians aren’t the only ones looking at how renewable energy could help ease energy costs and reduce demand on the grid for schools.

Western Sydney-based HIVVE have developed an innovative way to provide the benefits of solar to schools using solar powered portable classrooms.

With $368,000 in funding from ARENA in late 2017, the start-up has installed state-of-the-art modular relocatable classrooms, powered by rooftop solar PV and battery storage.

In November, the third HIVVE classroom was officially opened at Bracken Ridge High School in Brisbane’s northern suburbs.

Unlike their first two classrooms – located at Dapto High and St Christopher’s Primary in NSW – the newest relocatable will operate entirely off-grid. With energy generated on the roof of the classroom stored in a Tesla Powerwall 2 battery, the system is able to generate 7600 KWh of electricity beyond its own requirements.

The excess energy will be utilised across other school buildings with a behind the meter connection, reducing the school’s overall reliance on grid power.

When the Bracken Ridge portable was launched, HIVVE co-founder Richard Doyle said solar power has an energy profile perfectly matched to the demands of a school day.

He sees an opportunity for their technology to be rolled out widely, with the management system able to be retro-fitted to existing school buildings and relocatable classrooms.

While the Territory are focussed on solar energy to power schools, the potential for HIVVE portables to be equipped with batteries to run off grid can avoid the need for schools to pay significant upfront connection costs as schools expand or are redeveloped.

HIVVE believe their renewably powered classrooms could help to meet a NSW Government pledge to spend $500 million installing air conditioning at 1000 schools, without draining the grid.

Doyle said their system could have particular value given “many schools on the Eastern seaboard are currently at capacity on grid connection.”

Top marks for new off-grid solar classroom

The school bells have rung and class has started in Australia’s first 100 per cent solar and battery powered relocatable classroom.

Building on the success of Hivve’s first two solar portables installed at Dapto High and Sydney’s St Christopher’s Primary, a third renewable energy powered classroom has opened at Bracken Ridge High School in suburban Brisbane.

Unlike the first two solar Hivves, the newest classroom will be entirely powered by solar and batteries and won’t be connected to the electricity grid.

Hivve co-founder Richard Doyle said taking the solar classrooms off-grid was “an absolute no-brainer.”

“Demountables are often put in as a temporary solution and remain permanently. The Hivve has been designed to replace that model in a sustainable and smart way,” Richard Doyle said.

Faced with a bill of more than $35,000 for a grid connection, the decision was made to install a Tesla powerwall and only connect the classroom to the school to share excess solar power produced on-site. Based on data gathered from the two Hivves, it’s expected that Bracken Ridge High’s new high-tech portable will produce enough energy to power two additional classrooms.

With an energy profile perfectly matched to the demands of a school day, Doyle said the solar setup is pushed hard to “maintain a temperature of between 20-24 degrees during the school day.”

He sees an opportunity for their technology to be rolled out widely following a pledge from the New South Wales Government to spend $500 million installing air conditioning in 1,000 schools.

“We’re collecting performance data for these buildings to show how Hivve can deliver that with no impact on the grid,” he said.

Doyle says the model is also well-suited for use in remote communities.

ARENA has provided nearly $370,000 to the three classroom pilot program which Hivve developed in collaboration with Tesla. ARENA CEO Darren Miller says the program opens the door for more Australian schools to switch to renewables.

“Demand for energy at schools occurs during the school day, when the sun is shining. There is a great opportunity to power classrooms via solar, backed up by battery storage,” Darren Miller said.

Rapidly growing populations and the rising popularity of solar is pushing transmission infrastructure to the limit, giving the new off-grid setup extra appeal.

“Many schools on the Eastern seaboard are currently at capacity on grid connection. This Australian-developed solution could help schools reduce costs and emissions, while also reducing reliance and demand on the grid,” he said.

“This solar-and-battery powered Hivve classroom at Bracken Ridge is both sustainable and self-sufficient as it powers itself while being completely off grid. The school avoids the significant upfront cost of grid connection while also saving on ongoing energy costs,” Mr Miller said.

Benefits being shared with existing buildings

According to Hivve, the oldest relocatable classroom in New South Wales was built in the 1960s.

The new modular portables have lessons from their old, poorly insulated and ugly forebears, designed for the long-term with the realisation that demountables are often put in as a temporary solution that remains permanently.

With each Hivve able to generate around 7600KWh of solar power every year in addition to its own requirements, the state of the art classrooms will reduce their host school’s reliance on grid power and bring down electricity bills.

Dapto High School’s Hivve

They can also help to create a healthy environment for learning by measuring CO2 levels and alerting teachers when air quality deteriorates. Fresh air can be introduced through the heating/cooling system, or by opening a window.

While the new Bracken Ridge Hivve won’t be connected to the grid, all of the excess solar energy it produces will be captured on-site with a behind the meter connection to other school buildings.

The ARENA funded pilot will run for 12 months and data collected will be used to demonstrate how renewable energy could power schools.

The AFL solar scoreboard

After battling through a long, cold winter, footballers aren’t alone in benefiting from the recent sunny September days.

Clubs around the country are installing solar panels to reduce their energy bills and flex their environmental muscle. Given offices, gyms, recovery centres and pools chew through most of their electricity during daylight hours, solar is a perfect fit.

Grand Final week is the perfect opportunity to recognise the real AFL heroes – the football clubs taking a punt on solar.

Punt Road Oval. Image: Metrosolar

Collingwood and West Coast might be fighting to be Premiers, but other AFL clubs are the champions when it comes to embracing renewable energy.

This week as the Eagles and Magpies line up for the Grand Final bird fight, let’s celebrate something we can all get behind.

The votes are in, the sun is shining. Here’s to the AFL’s best on ground solar performances.

Gold Coast Suns ‘solar halo’

The appropriately named Gold Coast Suns were early adopters, integrating a ‘solar halo’ during construction of their Carrara training base in 2011. The ring of custom made panels circle the top of the stadium, making the most of the sunshine state’s natural advantages with a 200kW punch.

Metricon Stadium’s ‘solar halo’. Image: Watpac


Essendon – True Value Solar Centre

In one measure to enhance performance, the Essendon Football Club moved their training base from Windy Hill to the True Value Solar Centre in 2014. As well as sponsoring the football team at the time of the move, the solar installers also installed panels to offset the energy demand from Essendon’s state of the art home base.

Richmond – Punt Road PVs

Ousted reigning premiers 2018 Richmond installed a 100kW solar setup on the historic Punt Road Oval grandstand in 2014. The club’s former ‘sustainability partner’ Metro Solar fitted the system, which supplies power to their gym, treatment and recovery clinic, education spaces and offices.

North Melbourne – Arden Street shines

In 2016 the Kangaroos grabbed the ball and ran with it, fitting a massive 200kW array to the Arden Street Oval’s two major rooftops. Receiving funding from the Clean Energy Finance Corporation and local council, the 800 panel system was the biggest in the City of Melbourne when installed, reducing the club’s reliance on grid-supplied power by 22 per cent.

Fremantle Dockers – Cockburn solar boom

Fremantle have also seen the light, working with their sponsor Solargain to install a 100kW system on their Cockburn training base. The Docker’s rooftop panels are part of the largest rooftop system in Western Australia – 1MW of photovoltaics have been deployed at the Cockburn Aquatic and Recreation Centre where Fremantle are an ‘anchor’ tenant.

‘Solar superman’ scoops Global Energy Prize

UNSW Scientia Professor Martin Green has become the first Australian to win the Global Energy Prize, beating Elon Musk to the prestigious $820,000 award.

Professor Green was honoured for having revolutionised the efficiency and costs of solar photovoltaics, making this the lowest cost option for bulk electricity supply.

ARENA CEO Ivor Frischknecht with Professor Martin Green

Australia’s ‘father of photovoltaics’ – or ‘solar superman’ – requires little introduction. He is director of the Australian Centre for Advanced Photovoltaics at UNSW, and with his students has driven sharp reductions in costs of photovoltaic solar systems by establishing manufacturing centres in Asia.

The annual Global Energy Prize – which he will share with Russian scientist Sergey Alekseenko – honours outstanding achievements in research and technology that are addressing the world’s pressing energy challenges.

ARENA has been proud to fund some of Professor Martin Greens’ groundbreaking work, most recently awarding his University of New South Wales research unit $16.4 million when they took out 11 of the 20 successful projects in last year’s solar research funding round.

One of these projects is attempting to find a new form of adamantine compound that can be overlaid on top of silicon solar cells to create a more efficient cell. Professor Green is optimistic that the resulting “tandem cells” can break through the barrier of 25 per cent efficiency that limits most current cells.

Going back to 1989, Professor Greens’ team supplied the solar cells for the first photovoltaic system with an energy conversion efficiency of 20%. And in 2014, he headed the development team that first demonstrated the conversion of sunlight into electricity with an energy conversion efficiency of 40%.

Speaking at last year’s ARENA’s Innovating Energy Summit, Green told the audience that constructing one terrawatt of solar PV offers the best chance to keep global temperature rises below the 2 degrees pledged in the Paris climate accord.

Responding to the news that he had come out on top of the ten finalists – including Tesla founder Elon Musk – in the Global Energy Award, Professor Green said he was proud to receive the prize given the quality of candidates in the field.

“The efficiency of solar modules is an area whose progress has been faster than many experts expected, and this is good news.”

“We need to maintain the pace of research in Australia, not only to keep our international lead, but also to benefit society by providing a cheap, low carbon source of electricity,” he said.

Over his career Professor Green has received many scientific and industry awards. In 2003 he was awarded the Karl Boer Solar Energy Medal of Merit, and in 2004 he received the World Technology Award in the field of energy. He holds many patents and has authored eight books, as well as more than 750 publications.

Professor Green will be presented with the award in Russia in October.


Monash University Building Integrated PV Study

Funding boost for world-leading solar PV research

On behalf of the Australian Government, the Australian Renewable Energy Agency (ARENA) today announced it has awarded $29.2 million for 20 research projects to propel the development of solar photovoltaic (PV) technology.

The funding has been offered to research teams from the University of New South Wales, Australian National University, Monash University and the Commonwealth Scientific and Industrial Research Organisation (CSIRO).

ARENA’s third round of R&D funding supports early-stage research to reduce the cost and improve the efficiency of solar PV, from creating flexible solar devices to making semi-transparent, high-efficiency solar cells for integrating into windows.

Most of the projects will focus on silicon technologies, as the vast majority of solar panels worldwide are currently made using silicon. Some projects will aim to develop solar cells using new materials, such as organic photovoltaics and perovskites, which would be lower cost to manufacture, printable or more sustainable.

Together with contributions from industry partners and leading institutions from Asia, Europe and the United States, total value of the projects is approximately $102 million.

ARENA CEO Ivor Frischknecht said Australian innovation was already built into many silicon solar panels made globally, and this funding would accelerate solar PV technology.

“Australia is leading the world in solar PV research and development. Over the past five years, ARENA has funded breakthroughs which have helped make solar PV competitive with wind power and we want to take that even further.

“In this funding round, the candidates and the calibre was so high, we actually increased the total funding we awarded to nearly $30 million,” Mr Frischknecht said.

“This research will improve the technological and commercial readiness of new innovation in solar PV cells and modules, enhance Australia’s position as world-leaders in solar PV R&D and address Australian-specific conditions,” he said.

ARENA media contact:

0410 724 227 |

Download this media release (PDF 147KB)

How Aussie solar could power a new space race

Picture a world where satellites and self-navigating planes beam high-speed wireless internet to people from Adelaide to the Arctic, all of it powered by Australian solar technology.

That vision might not be too far from reality thanks to a group of solar-cell specialists from the University of NSW (UNSW).

Supported by ARENA and led by world-renowned photovoltaics researcher Professor Allen Barnett, the team has created a lightweight, flexible and incredibly efficient solar cell that is perfect for high-altitude applications.

Professor Barnett and his team. IMAGE: UNSW.



Most solar cells are made of silicon, which has become cheap and readily available. But it has some limits when it comes to efficiency.

Sunlight is made up of light particles (photons) with a wide range of wavelengths. The shorter a photon’s wavelength, the more energy it contains, and the higher a voltage it can produce when converted into electricity.  

However, silicon cells convert all photons to electricity at the same voltage. They can’t harness the energy contained in the low-wavelength, high-energy photons, which is one of the reasons why even the best silicon solar cells have been stuck at around 25 per cent efficiency for the past 20 years.


UNSW overcame this limitation by layering two extremely thin solar cells on top of each other. The bottom cell is a silicon alloy, while the top cell is made from Gallium-Arsenide-Phosphide (GaAsP).

The chemical properties of GaAsP let it capture the high-energy photons while letting the low-energy ones pass through to the silicon alloy layer. This dual-layer approach means that GaAsP solar cells could be up to 40 per cent more efficient than the best silicon cells in use today.

GaAsP solar cells could be up to 40 per cent more efficient than the best silicon cells in use today. IMAGE: UNSW.


The downside of GaAsP cells? They’re still not as cheap as the silicon ones. And there isn’t much incentive for the makers of rooftop systems and solar farms to fork out for ultra-efficient cells when they could just add more panels. (However, Professor Barnett has calculated that GaAsP may be cost-effective for solar plants with sun-tracking technology, like the Moree Solar Farm.)

Of course there are some places where low weight, high efficiency solar panels are worth paying a premium for.

Like space.

“Most satellites today are owned by telecommunications or the military, who don’t care about the cost of solar cells.” Professor Barnett says. “But the new applications that are coming are commercial.”

Virgin, Airbus and SpaceX are just some of the companies looking at using swarms of low-orbit satellites for high-speed communications. Other tech firms – including Facebook and Google – want high-altitude, long-endurance unmanned aerial vehicles (drones) to deliver wireless internet to virtually any point on Earth.

All of these projects need solar cells that are extremely efficient, ultra-light and resistant to radiation from outer space.

“We can do a fifth of the cost and a fifth of the weight of the military stuff.” Professor Barnett says. “Our designs are also radiation-hard and flexible enough to be built into a curved airframe.”


There are a couple of ways to make a multi-layer solar cell. “One is to just take two solar cells and glue them together, but that costs too much,” says Professor Barnett. “The other way is to grow them.”

That might conjure up images of farmers carefully nurturing fields of photovoltaic cells from seed, but growing a GaAsP cell is actually closer to baking than gardening.

A base layer of silicon is placed inside a vacuum-sealed reactor, which is heated up to 900ºC and filled with a vapour. This causes a chemical reaction that ‘grows’ incredibly thin layers of crystalline silicon alloy on the base. Layers of GaAsP are grown on top of the alloy using a different vapour before the pure silicon base layer is chemically removed.

The process takes less than five minutes and creates layers about 1/50 the width of a human hair, making GaAsP cells significantly thinner and lighter than a comparable silicon cell.

It’s also the same process used to make LEDs, meaning that manufacturing costs could be kept down by using existing tools and production lines.

A researcher at work in the UNSW lab. IMAGE: UNSW.


The team has a few more steps to complete before GaAsP cells will be powering Facebook-branded drones or satellites.

“We have to get third-party validation of the efficiency and then we have to use these LED tools to get the cost of growing them down.” Professor Barnett says. “We’re still three to five years away.”

But the potential is definitely there: the UNSW team has already had private talks with a number of companies and estimates that the market for satellite and plane-based solar cells will be worth $700 million a year by 2025.

“In that range of efficiency, we are by far the lowest cost and the lowest weight.” says Professor Barnett. “We are the absolute leaders in this space today.”

Read the full knowledge sharing report from this completed ARENA project HERE.


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‘It’s gunna get big’: the story of a new solar farm and the people behind its rise.

“It’s gunna get big.”

With those words Parkes local Sam Hawker hits on something that is true of both the solar farm he is helping to construct as well as the industry and technology it represents.

Something has happened in Parkes that has changed more than just the energy mix being created and consumed. It has changed the town itself.

“I’m a third generation farmer in the Parkes district,” says Ken Keith, the local Mayor and a landowner who adjoins the solar farm with his sheep property. “I’m sure my grandfather would never have thought that he would have a solar farm next to him.”

Sam Hawker at the Parkes Solar Farm where he works. IMAGE: ARENA.

These characters and the stories of many others living and working around them are captured in A Quiet Evolution, a mini documentary produced for ARENA by filmmaker Steve Doyle.

The film chronicles the birth of the Parkes Solar Farm, a 55 MW photovoltaic facility which features approximately 206,000 solar panels on 210 hectares near the NSW regional city.

It will soon be producing enough electricity to power 21,000 homes.

Parkes is one of 12 similar projects funded by ARENA’s Large Scale Solar funding round. The plant will use solar PV panels mounted on a tracking system that shifts the angle of the panels to follow the sun.

And that allows the maximum amount of sunlight to be captured by the solar panels for conversion into electricity.

Rows of solar panels greet the sun at the Parkes Solar Farm. IMAGE: ARENA

ARENA contributed almost $7 million to the $114 million cost of the project.

Filmmaker Doyle was hired by ARENA to spend some time in Parkes and tell the story of what happens in a regional community when large scale solar comes to town.

For one thing: jobs (around 120 of them). At the time of the company’s most recent report 57,378 hours of work had been poured into transforming the site into a solar farm.

Telling that story took time. Doyle prepared, researched, interviewed and shot the film over a two month period, interviewing local residents, workers on the project and representatives of the large companies behind it.

In total he captured almost eight hours of footage, distilling that into ten minute and three minute long films.

Tory Moon works on the farm and is Parkes “born and bred”. IMAGE: ARENA.

“The video captures the emergence of the Large Scale Solar industry into a maturity that will sustain it for the next 30 years & beyond,” he says.

“I loved the opportunity to tell the story of that emergence through the words & feelings of a range of people working on the site.”

A Quiet Evolution, introduces characters such as Tory Moon, a Parkes local “born and bred” who has risen to lead a team engaged in constructing the solar farm.

The film speaks to a number of people employed in the installation of the facility, which is owned and will be run by Neoen, an independent power producer that develops, finances, builds and operates renewable energy facilities.

The 12 large scale solar farms being supported by ARENA will increase the nation’s experience in planning and building renewable power plants, help to make such projects more commercial and also boost their attractiveness for private investors.

As the 12 projects near completion it is clear that they have played a massive role in transforming not just renewable energy but the communities in which they are situated.

Row upon row of gleaming panels have now been installed and the farm will soon be supplying clean, renewable energy. “It’s gunna get big,”  Sam Hawker predicted.

There can’t be much doubt he was right.

$20 million funding for solar PV’s next great leap forward

The Australian Renewable Energy Agency (ARENA) has announced a $20 million funding round to propel solar photovoltaic (PV) research and development.

ARENA’s third competitive research and development funding round seeks to drive innovation to make solar PV more affordable, more efficient and more competitive.

ARENA Chief Executive Officer Ivor Frischknecht said this would help reduce the future cost of solar PV. “This dedicated research and development funding for solar PV is part of our commitment to finding and supporting further breakthroughs in solar PV,” he said.

“Australia has some of the best solar PV researchers in the world, and we want to build what we’ve already accomplished. This leverage the impressive gains already made in cost reduction and cell efficiency. And that is just the beginning. We see a future where solar cells might be on every surface,” he said.

Since 2012, ARENA has committed $109.3 million in funding to solar PV R&D projects, fellowships and scholarships. ARENA funding has helped to break 14 solar efficiency world records.

Earlier this month,ARENA launched its Investment Plan, which sets out accelerating solar PV innovation as one of the top priorities for the coming years.

“By continuing to support innovation in solar PV, we believe that solar power could produce more than 30 per cent of Australia’s electricity within 15 years,” Mr Frischknecht said.

The funding round will be open to Australian solar PV researchers undertaking projects focussed on emerging and established solar PV cell and modules technologies. ARENA expects to award grants of between $500,000 and $5 million for any single project.

“We are calling for research projects that demonstrate the potential to lower the cost of

materials or improve performance that will reduce costs or increase efficiency,” he said.

The funding round will open from 24 May 2017 until 21 June 2017. Funding guidelines will be available from ARENA’s website on 24 May 2017. Information sessions will be held in Canberra, Sydney and Melbourne in early June 2017.

ARENA media contacts:

ARENA Media | Mobile: 0410 724 227 | Email:

Media release – ARENA SOLAR PV RD ROUND (PDF 121KB)

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