Roasting Coffee with the Rays of the Sun

Antonio Durbe, left, and Daniele Tummei overlook the functioning of the Purosole, Pure Sun, solar light coffee roaster, in Rome, Wednesday, Oct. 13, 2021. (AP)
Antonio Durbe, left, and Daniele Tummei overlook the functioning of the Purosole, Pure Sun, solar light coffee roaster, in Rome, Wednesday, Oct. 13, 2021. (AP)
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Roasting Coffee with the Rays of the Sun

Antonio Durbe, left, and Daniele Tummei overlook the functioning of the Purosole, Pure Sun, solar light coffee roaster, in Rome, Wednesday, Oct. 13, 2021. (AP)
Antonio Durbe, left, and Daniele Tummei overlook the functioning of the Purosole, Pure Sun, solar light coffee roaster, in Rome, Wednesday, Oct. 13, 2021. (AP)

Combining two of Italy's delights — coffee and sunshine — a couple of engineers in Rome have created an environmentally friendly way to roast coffee beans without electricity or gas.

Antonio Durbe and Daniele Tummei have spent almost six years building and perfecting their sunlight coffee roaster.

The result is a system that needs a piece of land about the size of half a tennis court and sunny weather to roast up to 50 kilograms (110 pounds) of coffee an hour.

The plant is run entirely by energy from the sun. Sunrays are concentrated by a set of mirrors on a coffee roaster and even the few electrical parts are powered by a small solar panel. Sensors controlled by a computer allow the mirrors to follow the sun throughout the day and focus its light on a rotating steel basket that contains the fresh coffee beans. The basket reaches peak temperatures of about 240-250 C (450-480 F), depending on the sun's brightness, and can roast the beans in 20 minutes.

The process isn't only environmentally friendly and economically convenient. According to Durbe and Tummei, it also better preserves the coffee’s aroma, giving it a richer flavor. Unlike conventional hot air ovens, which are typically gas-powered, the concentrated sunlight roasts the coffee without heating the air around it — by penetrating the grains in a more uniform way and without burning the exterior.

Naturally, the system does depend on good weather. On cloudy days or after sunset, coffee lovers need to turn elsewhere.

However, in sunny southern Italy, a plant with 40 mirrors is capable of roasting up to 30,000 kilograms (66,000 pounds) of coffee a year, saving about 60,000 kilowatt-hours of electricity, according to the inventors.

Their Purosole, or pure sun, coffee can be bought online, but the main goal of the inventors is selling their solar coffee roasting plants to small businesses who are sensitive to the environment. Right now, they are operating their plant in the garden of a friend.

The system can be put to other uses as well. At the end of a long work day, Durbe and Tummei place a grill in in front of the mirrors to prepare some delicious sunlight barbecue.



OpenAI Abandons Plan to Become For-profit Company

'OpenAI is not a normal company and never will be,' OpenAI CEO Sam Altman wrote in an email to staff posted on the company's website. JOEL SAGET / AFP
'OpenAI is not a normal company and never will be,' OpenAI CEO Sam Altman wrote in an email to staff posted on the company's website. JOEL SAGET / AFP
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OpenAI Abandons Plan to Become For-profit Company

'OpenAI is not a normal company and never will be,' OpenAI CEO Sam Altman wrote in an email to staff posted on the company's website. JOEL SAGET / AFP
'OpenAI is not a normal company and never will be,' OpenAI CEO Sam Altman wrote in an email to staff posted on the company's website. JOEL SAGET / AFP

OpenAI CEO Sam Altman announced Monday that the company behind ChatGPT will continue to be run as a nonprofit, abandoning a contested plan to convert into a for-profit organization.

The structural issue had become a significant point of contention for the artificial intelligence (AI) pioneer, with major investors pushing for the change to better secure their returns, AFP said.

AI safety advocates had expressed concerns about pursuing substantial profits from such powerful technology without the oversight of a nonprofit board of directors acting in society's interest rather than for shareholder profits.

"OpenAI is not a normal company and never will be," Altman wrote in an email to staff posted on the company's website.

"We made the decision for the nonprofit to stay in control after hearing from civic leaders and having discussions with the offices of the Attorneys General of California and Delaware," he added.

OpenAI was founded as a nonprofit in 2015 and later created a "capped" for-profit entity allowing limited profit-making to attract investors, with cloud computing giant Microsoft becoming the largest early backer.

This arrangement nearly collapsed in 2023 when the board unexpectedly fired Altman. Staff revolted, leading to Altman's reinstatement while those responsible for his dismissal departed.

Alarmed by the instability, investors demanded OpenAI transition to a more traditional for-profit structure within two years.

Under its initial reform plan revealed last year, OpenAI would have become an outright for-profit public benefit corporation (PBC), reassuring investors considering the tens of billions of dollars necessary to fulfill the company's ambitions.

Any status change, however, requires approval from state governments in California and Delaware, where the company is headquartered and registered, respectively.

The plan faced strong criticism from AI safety activists and co-founder Elon Musk, who sued the company he left in 2018, claiming the proposal violated its founding philosophy.

In the revised plan, OpenAI's money-making arm will now be fully open to generate profits but, crucially, will remain under the nonprofit board's supervision.

"We believe this sets us up to continue to make rapid, safe progress and to put great AI in the hands of everyone," Altman said.

SoftBank sign-off

OpenAI's major investors will likely have a say in this proposal, with Japanese investment giant SoftBank having made the change to being a for-profit a condition for their massive $30 billion investment announced on March 31.

In an official document, SoftBank stated its total investment could be reduced to $20 billion if OpenAI does not restructure into a for-profit entity by year-end.

The substantial cash injections are needed to cover OpenAI's colossal computing requirements to build increasingly energy-intensive and complex AI models.

The company's original vision did not contemplate "the needs for hundreds of billions of dollars of compute to train models and serve users," Altman said.

SoftBank's contribution in March represented the majority of the $40 billion raised in a funding round that valued the ChatGPT maker at $300 billion, marking the largest capital-raising event ever for a startup.

The company, led by Altman, has become one of Silicon Valley's most successful startups, propelled to prominence in 2022 with the release of ChatGPT, its generative AI chatbot.