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Jeffrey Char

@JSeedVentures

Jeffrey Char is a serial entrepreneur, investor and educator focusing on sustainable energy systems, climate tech and agtech. #energy

 Tokyo, Japan
about.me/jeffchar
Joined July 2009
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  • Followers1.4K
1.3KMedia
Photo by Jeffrey Char (@JSeedVentures)Photo by Jeffrey Char (@JSeedVentures)Photo by Jeffrey Char (@JSeedVentures)Photo by Jeffrey Char (@JSeedVentures)Photo by Jeffrey Char (@JSeedVentures)Photo by Jeffrey Char (@JSeedVentures)Photo by Jeffrey Char (@JSeedVentures)Photo by Jeffrey Char (@JSeedVentures)Photo by Jeffrey Char (@JSeedVentures)
Learning from rejection seths.blog/2026/11/learning-…
Learning from rejection

Learning from rejection

If you’re doing something creative, something important or something new, you’re certain to be rejected along the way. It’s a signal. It might be proof that you offered it to the …

seths.blog
18
Fervo Energy Expands Geothermal Pipeline With Landmark Google Power Agreement alphaxioms.blogspot.com/2026…
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How fracking paved the way for epic geothermal growth
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Excellent post by Ikuo Hiraishi. The Last Analog Empire: Construction substack.com/home/post/p-223…
28
Amid questions over Japan’s cybersecurity, just how safe is the My Number system? japantimes.co.jp/news/2026/1…
Amid questions over Japan’s cybersecurity, just how safe is the My Number system?

Amid questions over Japan’s cybersecurity, just how safe is the My Number system?

With over 80% of the population using My Number, concerns have emerged over the country’s all-in-one card and the personal information stored in it.

japantimes.co.jp
12
World-first hollow-core fiber test sends data over 626 miles in China interestingengineering.com/i…
World-first hollow-core fiber test sends data over 626 miles in China

World-first hollow-core fiber test sends data over 626 miles in China

China sets a new record with a 625-mile hollow-core fiber test, transmitting 64 Tbps in both directions.

interestingengineering.com
18
New Metal Panel Turns Seawater Into Drinking Water Using Sunlight studyfinds.com/metal-panel-s…
New Metal Panel Turns Seawater Into Drinking Water Using Sunlight

New Metal Panel Turns Seawater Into Drinking Water Using Sunlight

Seawater desalination usually leaves harmful brine behind. A new laser-etched panel captures nearly all the salt instead.

studyfinds.com
10
Ambiguity or clarity?
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Microsoft plans to use fewer neoclouds as AI buildout shows signs of strain
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Geothermal Beyond the Constraints of Subsurface Fluids: Technology Trends in Closed-Loop Geothermal and Prospects for Deployment in Japan Markets | GeoVanguard Intelligence geovanguardintelligence.com/…
Geothermal Beyond the Constraints of Subsurface Fluids: Technology Trends in Closed-Loop Geothermal...

Geothermal Beyond the Constraints of Subsurface Fluids: Technology Trends in Closed-Loop Geothermal...

—Multilateral and Coaxial Designs, the Technology Strategies of Three Overseas Companies, and Long-Term Thermal Performance in Hot-Spring Regions— The

geovanguardintelligence.com
21
Beyond Dependence on Natural Hydrothermal Resources:Advances in EGS Technology and the Conditions for Deployment in Japan and Asia | GeoVanguard Intelligence geovanguardintelligence.com/…
Beyond Dependence on Natural Hydrothermal Resources:Advances in EGS Technology and the Conditions...

Beyond Dependence on Natural Hydrothermal Resources:Advances in EGS Technology and the Conditions...

—Technology Transfer from the Shale Industry, Induced Seismicity Risk Management, and Deployment Challenges in Tectonically Active Regions— Geothermal

geovanguardintelligence.com
21
“Not yet” seths.blog/2026/11/not-yet/
“Not yet”

“Not yet”

The reason we train is to get better. Every successful product goes from version 1.0 to 2.0, eventually. Very few people still drive a Model T. It’s not perfect, not yet. But we ship the work…

seths.blog
26
New titanium thin film turns waste heat into power 250 times better interestingengineering.com/i…
New titanium thin film turns waste heat into power 250 times better

New titanium thin film turns waste heat into power 250 times better

Researchers added titanium to thin films in electronic devices, improving their heat-to-electricity-generating capacity by 250 times.

interestingengineering.com
16
SVOLT launches series production of its semi-solid-state battery - electrive.com electrive.com/2026/10/27/svo…
electrive – the industry's leading emobility media

electrive – the industry's leading emobility media

We offer comprehensive reporting of the highest quality - as a central platform for the rapid ramp-up of electromobility. With news, background information, driving reports, interviews, videos and a...

electrive.com
16
Singapore to study geothermal power after survey finds vast potential beneath the city-state eco-business.com/news/singap…
Singapore to study geothermal power after survey finds vast potential

Singapore to study geothermal power after survey finds vast potential

METI minister Tan See Leng also unveiled plans to triple battery storage, a S$75 million fund for cleaner power generation, approval for a 1.3GW renewable import project to Sembcorp and a deal to...

eco-business.com
13
Inside Intersect’s behind-the-meter gamble
27
How Cacao Can Do So Much More Than Make Chocolate wri.org/insights/hidden-bene…
How Cacao Can Do So Much More Than Make Chocolate

How Cacao Can Do So Much More Than Make Chocolate

The cocoa industry produces 700,000 tons of waste, yet much of the discarded organic material can be transformed into valuable byproducts benefiting the land and farmers.

wri.org
20
Interesting discussion on how the AI-driven clean-energy boom is undergoing a market correction as investors to demand proven commercial viability. The AI Stock Selloff Is Hitting Clean Energy youtube.com/watch?v=8cLmUni0…
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Mitsubishi Power Deliveries Stretch to 2031 as Gas Turbine Shortage Hits Data Centers and Utilities - Energy News Beat
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21
Origami-based construction method yields lightweight, load-bearing structures on architectural scales news.mit.edu/2026/origami-ba…
Origami-based construction method yields lightweight, load-bearing structures on architectural...

Origami-based construction method yields lightweight, load-bearing structures on architectural...

An origami-based structural system developed at MIT can be used to design complex, lightweight structures that are stiffer, stronger, and easier to assemble than other types of architectural origami,...

news.mit.edu
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