IM 2021 January 21 | Page 29

MINE POWER a 2 MW / 1 MWh battery system .
Once fully operational , it will reduce the mine ’ s fuel consumption by 10-13 % – the equivalent of removing 2,000 cars from the road , according to Aggreko .
George Whyte , Managing Director , Australia Pacific and Global Mining Sector Leader at Aggreko , said the Granny Smith solution was “ very representative ” of the type of renewable integration possible in mining , referencing the even greater 20 MW of solar PV units installed alongside the hybrid microgrid at Syama .
He expanded on this for IM : “ When designing these solutions , our experts do of course need to take a look at the requirements and conditions at the particular site , with the location and solar irradiation at the site also playing a big role .
“ However , on the whole , hybrid solutions are becoming an increasingly popular option for customers , offering both a cost reduction as well as a huge saving in emissions . The microgrid installed at Granny Smith will save approximately 9,500 t CO 2e across the project ’ s lifetime .”
One of the biggest hybrid projects currently under construction within mining is taking place in Western Australia .
Fortescue Metals Group ’ s Pilbara Generation project will see 150 MW of gas-fired generation integrated with 150 MW of solar PV generation and large-scale battery storage to power the company ’ s iron ore assets in the state . The hybrid energy system will be connected to a new transmission network Fortescue is building in the Pilbara , ensuring the right
IM reported on the latest developments with 247 Solar ’ s modular , scalable concentrated solar power technology in this same issue last year .
Using heliostats as opposed to PV cells and not requiring battery back-up for power storage , the technology could soon make a debut in California , USA ; a development the off-grid mining industry is watching intently .
The company recently reported that it , along with microturbine supplier Capstone Turbine Corporation , had successfully tested a revolutionary commercial turbine that can generate electricity using hot air at atmospheric pressure without combustion .
This significant breakthrough is made possible by an ultra-high temperature heat exchanger with technology that has its origins at the Massachusetts Institute of Technology ( MIT ). The 247Solar Heat Exchanger™ uses a proprietary nickel-chromium-aluminium-iron alloy engineered for sustained operation at very high temperatures , 247 Solar said .
This turbine is the heart of the first operational 247Solar Plant™ being built in California . The plant includes a system that concentrates sunlight to heat ambient-pressure air to 970 ° C , a high-enough temperature to drive the turbine to produce electricity without burning fuel .
The plant also includes the 247Solar Thermal Storage System™ , which stores sunlight as heat instead of electricity at a fraction of the cost of batteries , according to the company . The stored heat powers the turbine up to 20 hours at night and on cloudy days , reducing fuel consumption by up to 90 % – far more than PV and batteries , 247 Solar says .
To guarantee electricity 24 / 7 , even when there is no solar-heated air available , the turbine includes an optional combustor . The combustor is external to the turbine and can be engineered to burn most liquid and gaseous fuels , including hydrogen and biogas .
amount of electricity is supplied in a reliable , efficient This will help power FMG ’ s Iron Bridge magnetite and environmentally friendly manner . project specifically , with Pacific Energy subsidiary , Part of the gas-fired generation segment of the Contract Power Australia , installing the gensets . equation is being filled by Rolls-Royce and its agent juwi AG , which provides not only the microgrids Penske Australia , which is providing 15 medium but the full renewable energy installation on projects , speed gas gensets using 20-cylinder B36:45 gas also has much input to offer in this field . Its engines from Rolls-Royce ’ s Bergen Engines brand . fingerprints are on both the 23 MW solar

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