| Solar power
conventional crystal silicon solar cells and feature flexibility, enabling them to be installed and generate power on curved surfaces and other places impossible for crystal silicon solar cells.” They can also “maintain a relatively high-power generation efficiency even in low light.”
Right: Tandem solar cells make better use of the solar spectrum’s wave-lengths (on the left) to achieve higher efficiency. In this example, the perovskite cell of the tandem uses the area of the spectrum marked blue, while the silicon or CIGS cell uses the area in green. Graphics: ZSW
Sun spectrum 1.5 1.0 0.5 0.0
400 600 800 1000 1200 1400 Wave length (nm)
Bottom cell Top cell Stacked tandem cell
All change at Atacama
The Atacama 2 solar power plant in Chile, previously envisaged as a hybrid of CSP and PV, like Atacama 1, will now consist entirely of PV and its installed capacity will be increased significantly. Its name will also be changed, to Pampa Union Solar Plant.
Atacama 2, like Atacama 1, was to have consisted of 110 MW of CSP plus 100 MW of PV. The new plan calls for 600 MW of PV, to be supplied via power line to the existing Centinela substation. The revised project involves changing the route of the transmission line and the layout
of the construction site and camp.
The developer/owner of both projects is Cerro Dominador, owned by funds managed by EIG Global Energy Partners.
The 110 MW CSP component of Atacama 1 (aka Cerro Dominador), inaugurated in June 2021, was the first concentrated solar power facility to enter operation in Latin America. It was built by an Acciona-led consortium, with Abengoa (which declared itself insolvent in February 2021) as main constructor and technology partner. The plant is located near the town of María Elena in the Atacama Desert (Antofagasta region), which benefits from some of the highest levels of solar radiation in the world.
The CSP plant has a 17.5 hour thermal storage capacity based on its use of molten salts as the heat transfer medium. The solar field, covering 700 hectares, has 10 600 heliostats that reflect the sun’s radiation onto a receiver located at a height of 252 m. The CSP facility employs a Doosan Skoda Power steam turbine.
Left: Atacama 1 CSP plant
Nordic region’s largest roof-based solar park
NREP’s logistics branch, Logicenters, is to install the Nordic region’s largest ever roof-based solar park, on the roof of DLS Bålsta, an ultra-modern logistics centre (pictured) located on the outskirts of Stockholm.
The 8.9 MW solar park will cover an area of about 80 000 m2
.
It will be installed by Logicenters and will enable DLS Bålsta’s tenant, Axfood’s purchasing and logistics company Dagab, to operate using renewable power.
The DLS Bålsta logistics facility, 30 m high, with fully automated order picking system, is due to become operational in 2023.
The solar park is being installed by Solkompaniet and will comprise 16 553 bifacial panels. Power will be provided to Axfood via a power purchase agreement), whereby the company purchases all electricity produced over the next 25 years, with the opportunity to resell any surplus production.
Matthias Kettelhoit, chief executive officer of Logicenters, said: “The rooftops of logistics properties provide a fantastic opportunity to [become] a significant producer of renewable electricity that can be used by both tenants and external parties, with any surplus going into the grid.”
www.modernpowersystems.com | May 2022 | 33
AM1.5 Intensity (W/m2
/nm)
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