Better understanding of ‘albedo’ will unlock funding in bifacial solar

bifacial solar
Image by Bruno /Germany from Pixabay

The solar sector needs to improve its understanding of the ‘albedo’ resource to justify advertised production gains from bifacial modules and maintain investor confidence in projects built using the technology, a new study conducted by Solargis has found.

Albedo refers to the amount of sunlight (solar radiation) reflected by a surface, according to Energy Education.

Solar developers, asset owners, and independent engineers who take the initiative by adopting best practices to albedo assessment early, stand to make significant gains in a competitive market.

The study states that project developers are increasingly turning to bifacial modules to maximise the production of their sites – with the sector set to grow by a factor of ten between 2019-2024.

As bifacial module prices draw closer to monofacial, the technology has proliferated globally and helped drive a new wave of cost reductions for solar asset owners.

In key growth markets, the combination of bifacial modules and sun tracker technology has been behind record low bids. These bids have, in turn, put pressure on margins – requiring greater confidence in energy yield predictions.

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However, Solargis has found that the industry’s understanding of albedo is lacking. Bifacial modules are significantly more sensitive to variations in albedo than monofacial, leading to high uncertainty for energy yield estimates.

Projected performance gains of up to 17% for large-scale projects, widely accepted by investors, could fail to materialise in some cases, damaging trust in bifacial technology.

Solargis’ report pinpoints a high degree of temporal and spatial variability for albedo as a key challenge for accurate bifacial predictions. This means commonly available datasets lack the resolution to accurately assess the resource.

Additionally, at large-scale sites, albedo estimates based on a short-term measurement campaigns have a high level of uncertainty and cannot be relied upon.

Marcel Suri, CEO, Solargis, said: “High uncertainty around bifacial performance could cause issues when developers look to justify project design decisions. It may also raise questions around the long-term performance of bifacial modules, affecting financial modelling and projections. And this is why it is crucial to take proactive action as an industry to prevent these factors becoming an obstacle to the continued rollout of bifacial, so that solar investors can see the real efficiency gains these modules can bring to solar projects globally.”

Reports author Vicente Lara-Fanego, added: “Our work with asset owners and developers to optimise their bifacial projects showed us that the industry has a clear opportunity to build its understanding of the crucial albedo resource. We wrote these reports to explore the implications of albedo variations for solar asset owners and to set out best practice methodologies, ultimately helping the solar sector lay the groundwork for more widespread and effective use of bifacial technology.”

 Find out more about the report.

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