Solar power gaining momentum

PARIS (AFP) — Generating power from sunlight bouncing off the ground, working at night, even helping to grow strawberries: Solar panel technology is evolving fast as costs plummet for a key segment of the world’s energy transition.

The International Energy Agency (IEA) says solar will have to scale up significantly this decade to meet the Paris climate target of limiting temperature rises to 1.5 degrees Celsius above pre-industrial levels. The good news is that costs have fallen dramatically.

In a report on solutions earlier this year, the Intergovernmental Panel on Climate Change (IPCC) said solar unit costs had dropped 85 percent between 2010 and 2019, while wind fell 55 percent.

“There’s some claim that it’s the cheapest way humans have ever been able to make electricity at scale,” said Gregory Nemet, a professor at the University of Wisconsin–Madison and a lead author of that report.

Experts hope the high fossil fuel prices and fears over energy security caused by Russia’s invasion of Ukraine will accelerate the uptake of renewables.

Momentum gathered pace on Sunday with the ambitious United States (US) climate bill, which earmarks $370 billion in efforts to cut greenhouse gas emissions by 40 percent by 2030.

An analysis by experts at Princeton University estimates the bill could see five times the rate of solar additions in 2025 as there were in 2020.

Nemet said solar alone could plausibly make up half of the world’s electricity system by mid-century, although he cautioned against looking for “silver bullets.”

“I think there really is big potential,” he told AFP.

The “photovoltaic effect” — the process by which solar cells convert sunlight to electrical energy — was first discovered in 1839 by the French physicist Edmond Becquerel.

After decades of innovations, silicon-based solar cells started to be developed in the US in the 1950s, with the world’s first solar-powered satellite launched in 1958.

The IPCC said of all energy technologies, small-scale ones like solar and batteries have so far proved quicker to improve and be adopted than bulkier options like nuclear.

Today, almost all of the panels glimmering on rooftops and spreading across vast fields are made in China using silicon semiconductors. But the technology is changing quickly.

In a recent report, the IEA said these new solar cells have proven to be one-fifth more efficient in converting light to energy than standard modules installed just four or five years ago. There are also a host of new materials and hybrid cells that experts predict could supercharge efficiency.

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