Singapore Scientists Seek Power from Darkness through Shadow Energy

Dr. Swee Ching Tan holds a cardboard panel to cast a shadow over the shadow effect generator device next to an electrometer at a lab in the National University of Singapore June 26, 2020. (Reuters)
Dr. Swee Ching Tan holds a cardboard panel to cast a shadow over the shadow effect generator device next to an electrometer at a lab in the National University of Singapore June 26, 2020. (Reuters)
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Singapore Scientists Seek Power from Darkness through Shadow Energy

Dr. Swee Ching Tan holds a cardboard panel to cast a shadow over the shadow effect generator device next to an electrometer at a lab in the National University of Singapore June 26, 2020. (Reuters)
Dr. Swee Ching Tan holds a cardboard panel to cast a shadow over the shadow effect generator device next to an electrometer at a lab in the National University of Singapore June 26, 2020. (Reuters)

Scientists in Singapore are hoping to perfect a new method of power generation driven largely by shadows, with the hope that it could one day help highly urbanized cities power themselves.

The shadow-effect energy generator (SEG) being developed by the National University of Singapore has the potential to harness power like solar cells, but without needing open spaces with uninterrupted light.

To work effectively, the SEG requires both light and dark and, like solar panels, relies on light to shine on silicon to energize electrons.

However, using panels that feature a thin layer of either gold, silver, platinum or tungsten, the difference in light intensity drives electrons from lit areas towards the shade, creating electricity in the shaded areas.

“Our shadow effect generator comes in handy. It can be placed in those areas to harvest obstructed light,” said research team leader Dr. Swee Ching Tan.

The research is still in its early stages yet Tan’s team is already thinking about the potential of establishing a company to make SEG available for home use.

The panels the team have been testing are about 6 sq cm in size and capable of producing just 0.25 volts, meaning about 20 are needed to power a light bulb, or charge a cellphone.

The ideal environment for use would be cities, Tan said, with constantly shifting levels of light and shade throughout the day from clusters of tall buildings and the sun’s changing position in the sky.

“It’s not practical to place solar cells in such cities. So the device might come in handy in places like very densely populated cities, where skyscrapers are everywhere, where shadows are always persistent,” Tan said.



Britain to Introduce Digital Driving Licences this Year

A gaggle of geese stop traffic on The Mall as they cross the road in front of Buckingham Palace, in London, Britain October 10, 2022. REUTERS/Hannah McKay/File Photo
A gaggle of geese stop traffic on The Mall as they cross the road in front of Buckingham Palace, in London, Britain October 10, 2022. REUTERS/Hannah McKay/File Photo
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Britain to Introduce Digital Driving Licences this Year

A gaggle of geese stop traffic on The Mall as they cross the road in front of Buckingham Palace, in London, Britain October 10, 2022. REUTERS/Hannah McKay/File Photo
A gaggle of geese stop traffic on The Mall as they cross the road in front of Buckingham Palace, in London, Britain October 10, 2022. REUTERS/Hannah McKay/File Photo

Britain will introduce digital driving licences later this year in a push to use data to transform public services, the government said on Tuesday.

The licence will be held in a new GOV.UK digital wallet on smartphones and it will enable users to easily prove their age when buying age-restricted items as well as proving a right to drive.

Security features built into smartphones like facial recognition will ensure digital documents are secure even if a device is lost, the government said.

Other credentials issued by the government such as veteran cards and criminal record checks will be added by the end of 2027, it said, while physical documents would also remain available, according to Reuters.

The wallet will come alongside a government app, due this summer, that will make using services like applying for childcare or reporting a lost passport easier.

Science Secretary Peter Kyle said the GOV.UK wallet would mean that every letter or identity document received from the government could be issued virtually.

"For people who choose to use GOV.UK Wallet, they will find it easier to prove they're entitled to benefits or check their age when buying alcohol or DIY equipment, with more security and trust than ever before," he said.

"Crucially, it also opens huge opportunities to make interacting with public services much easier by putting people in control of their own data."

A government review published on Tuesday said the full digitisation of public services could result in more than 45 billion pounds ($55 billion) a year of savings and productivity benefits.

Digital driving licences already exist in Australia, Denmark, Iceland and in some US states.