Australia's 'Vast' Solar Resources Closer to Being Tapped In a Big Way

Australia’s largest solar plant moves one step closer to completion with the first of 1.35 million solar photovoltaic (PV) modules being installed on Wednesday at AGL’s Nyngan Solar plant in central NSW.

Located on a 250-hectare site about 550 km north-west of Sydney, the $290 million plant will have a capacity of 102 megawatts, or enough to power about 33,000 homes.

The plant is expected to be completed by next July and generate an estimated $137 million for the regional economy over its 30-year life span, said Scott Thomas, AGL’s general manager power development.

“AGL has already invested over $3 billion in renewable energy generation in Australia and with projects like the Nyngan Solar Plant, (it) is increasing the proportion of zero-carbon emission generation in the National Electricity Market,” Mr Thomas said.

The Baird government has lately stepped up public support for the renewable energy industry, placing it at odds with Coalition counterparts at the state and federal level.

Last week, Environment Minister Rob Stokes called for NSW to be “Australia’s answer to California” in promoting solar and wind energy, and also backed leaving the national renewable energy target – now being reviewed for a possible cut by an Abbott-government appointed panel – at current settings.

AGL’s Nyngan plant and a sister 53-megawatt solar project in Broken Hill will cost about $440 million to build, including $166.7 million in grants from the Australian Renewable Energy Agency (ARENA) and $64.9 million from NSW coffers.

For Nyngan alone, the cost will be $290 million, with ARENA’s funds totalling $116.1 million and $43.3 million from NSW.

“The NSW government’s support for this project has been vital and a very important role in the widespread development of utility scale solar across NSW and across Australia,” Leslie Williams, Parliamentary Secretary for Renewable Energy, said.

“NSW has vast solar resources and has long been a standout leader in photovoltaic research,” Ms Williams said. “We are now taking the next step and becoming a standout leader in renewable energy development.”

Laid out end to end, Nyngan’s PV panels would stretch about 1600 km, or roughly the distance from Sydney to Melbourne and back.

The twin solar plants may be among the last large-scale renewable plants to be developed for some time as on-going investor concern about the future of the Renewable Energy Target (RET) has all but frozen new spending in the sector in Australia.

Just $40 million was invested in the first half of 2014 – the lowest since 2001 – and a fraction of the almost $2.7 billion poured into large-scale renewable energy in 2013, Bloomberg New Energy Finance reported earlier this month.

Small-scale renewable energy has seen a less precipitous decline although cuts in feed-in tariffs and other support have seen PV installations slide from 60,114 systems in the first quarter of 2013 to 45,369 in the three months to June 2014, according to the Australian Solar Council.

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Fotowatio Plans to Build Australia’s Largest Solar-Power Project

Fotowatio Renewable Ventures, the solar-power plant developer backed by U.S. energy investor Denham Capital Management LP, won the right to build a 20-megawatt project near Australia’s capital.

Fotowatio will participate in the Australian Capital Territory’s feed-in tariff program, which rewards generators of solar power by paying above-market prices for the electricity, Simon Corbell, ACT minister for the environment and sustainable development, said today in a statement.

The Royalla solar farm, to be built about 25 kilometers (16 miles) south of Canberra, will become the largest in Australia by 2014, according to the statement. The venture will help in an effort to lower carbon emissions and shift away from fossil fuels, the ACT government said.

Fotowatio, which is based in the Netherlands, sought a new project in Australia after losing a competition earlier this year for federal government funds to build a large-scale solar plant in New South Wales state. Denham Capital in March reached an agreement with Fotowatio to invest $190 million in solar projects in markets including Australia.

Clean Energy With a Pinch of salt

A sodium-ion battery being developed in Australia is set to increase solar energy use and reduce our dependence on fossil fuels, according to researchers.

Although bulkier than commonly used lithium batteries, sodium-ion batteries will be cheaper, less toxic, and more environmentally friendly, said Manickam Minakshi, a chemistry and mineral scientist at Murdoch University, in Perth Australia.

“Our water-based sodium-ion battery has shown excellent potential for affordable, low-temperature storage,” he said.

Better batteries

Other batteries used for renewable energy storage – such as molten salt or molten sulphur – only work at high temperatures, making them expensive and impractical. Also, like lead-acid batteries, they are very corrosive and environmental pollutants, which aren't problems with sodium-ion batteries, said Minakshi.

The Murdoch team is now moving towards large-scale commercialisation, and the future could see these batteries connected to solar panels in every home. “This is a very exciting time,” said Minakshi.
The new sodium-ion battery has particular potential when coupled with the green power of solar energy. Widespread use of power from solar panels is limited because there are periods known as ‘non-generation’ times, when power cannot be produced. These include, for example, overcast weather or night-times.

Power in the dark

“Using solar energy panels to get power will only make sense when you can store the power when the Sun’s not shining,” said Stephen Thurgate, vice-president of program development partnerships at Sydney’s Macquarie University.

Murdoch’s new sodium-ion batteries could have applications in small networks with their own battery systems or ‘smart grids’ that use information and communication technology to reduce dependence on centralised power stations, said Thurgate.

While commonly used rechargeable lithium batteries have a higher voltage, making them more suitable for transport and vehicular power sources, they come with a lot of issues, said Minakshi.

Sodium: cheap and abundant

Lithium, for example, is more expensive and far less abundant than sodium in the Earth’s crust.
Another advantage of sodium-ion batteries is that they have a higher density, meaning they are able to store more energy for their weight. Combined with their low costs, they could open up affordable green energy to the developing world.

Lithium and sodium share similar chemical properties, but the sodium ion is 2.5 times the size of lithium, and a big challenge for the Murdoch researchers was finding a ‘host material’ for these large ions.

“Ions travel out of the cathode and into the anode to form a current,” said Minakshi. “As an imperfect analogy, you can think of them as mesh filters that ions pass through. We had to find materials with larger gaps in their mesh.”

Paving a path for alternative energy technology

Murdoch’s new development doesn’t spell the death of the lithium battery, which is still ideal for transportation because of its lighter weight, said Danielle Meyrick, deputy dean of the School of Chemical and Mathematical Sciences. “Sodium is slightly heavier and is much more suitable for stationary energy storage applications [such as] industry,” she said.

The sodium-ion technology could also enable the use of renewable energy in households, moving away from traditional energy generation sources.

“This kind of battery facilitates security of supply and continuity of electricity supply to households," said Meyrick. “It facilitates storage in times when there’s no sunlight, when there’s no wind, [and] when there’s no snow.”

Although there is more research to be done on finding the optimum scale of the battery and cell size, Thurgate said the findings were promising.

“The fact that [sodium-ion batteries are] based on readily available materials, that it’s an aqueous solvent [water-based] – so there’s no fear of the thing being flammable – [and] the fact the energy density is very high... are all great,” she said.