Skip to Content
77 Mass Ave

Covid-19’s sunny side

Lockdowns eliminated so much pollution that solar panels were able to produce more power.
October 20, 2020
solar panel covid illustration
solar panel covid illustration
Jose-Luis Olivares, MIT

As covid-19 brought travel and commerce to a standstill, air pollution cleared significantly enough to boost the performance of solar panels. In Delhi, one of the world’s smoggiest cities, output from solar installations increased more than 8%, according to a study by MIT mechanical engineer Tonio Buonassisi, former MIT research scientist Ian Marius Peters,  and colleagues.

The study was an extension of research the team has been conducting in Delhi for several years. Using pollution data collected at the US embassy and meteorological data collected by monitors at the solar installations, they had concluded that pollution generally reduced output by about 10%.

To assess the pandemic’s impact, they compared the data from before and after India went into mandatory lockdown on March 24, and also compared this with data from the previous three years. Pollution was down by about 50% after the shutdown, they found, and total solar output increased by 8.3% in late March and 5.9% in April—three to four times the typical fluctuations. 

An 8% increase might not sound like much, Buonassisi says, but “the margins of profit are very small for these businesses.” The findings demonstrate, he says, that the very act of using more solar electricity to displace dirtier fossil fuels makes the solar systems more efficient: putting solar panels on one’s house is “not only putting money in your pocket, but it’s also helping everybody else out there who already has solar panels installed, as well as everyone else who will install them over the next 20 years.”

Keep Reading

Most Popular

Rendering of Waterfront Toronto project
Rendering of Waterfront Toronto project

Toronto wants to kill the smart city forever

The city wants to get right what Sidewalk Labs got so wrong.

Muhammad bin Salman funds anti-aging research
Muhammad bin Salman funds anti-aging research

Saudi Arabia plans to spend $1 billion a year discovering treatments to slow aging

The oil kingdom fears that its population is aging at an accelerated rate and hopes to test drugs to reverse the problem. First up might be the diabetes drug metformin.

Yann LeCun
Yann LeCun

Yann LeCun has a bold new vision for the future of AI

One of the godfathers of deep learning pulls together old ideas to sketch out a fresh path for AI, but raises as many questions as he answers.

images created by Google Imagen
images created by Google Imagen

The dark secret behind those cute AI-generated animal images

Google Brain has revealed its own image-making AI, called Imagen. But don't expect to see anything that isn't wholesome.

Stay connected

Illustration by Rose WongIllustration by Rose Wong

Get the latest updates from
MIT Technology Review

Discover special offers, top stories, upcoming events, and more.

Thank you for submitting your email!

Explore more newsletters

It looks like something went wrong.

We’re having trouble saving your preferences. Try refreshing this page and updating them one more time. If you continue to get this message, reach out to us at customer-service@technologyreview.com with a list of newsletters you’d like to receive.