Impact Posts

Flagship video of the projects in Kenya and Tanzania

Posted Tuesday 31 October 2017 by Eva Wissenz.

After a year of operation with support of our sponsor and with our local partners, we are happy to present our achievements in Kenya and Tanzania.

Our local partners are ensuring the follow up of the project as well as data collection to prepare scale up.

Several communities have been equipped with our SOL5 device and have successfully adopted the technology to bake, roast peanuts or dehydrate fish, increasing income, decreasing charcoal use and improving working conditions.

It has been an exciting and challenging year and all the team contributed to make it a success, welcoming also new motivated people to make this world a better place for all.

Download our manifesto, "Direct Solar Economy" for free!

Very dynamic solar bakers in Tanzania

Posted Tuesday 10 October 2017 by Heikki Lindfors.

Buy what’s available, refine it, sell it for profit. Do it over and over again and support your family and community. This seems to be the operating model of the Tujijenge group working in the Makoko neighborhood in Musoma, Tanzania. They do all kinds of value-adding food processing, depending on what is available to them. That’s exactly the entrepreneurial spirit we like at GoSol!

When GoSol’s Heikki and Lorin met the Tujijenge group for the first time in May 2017, they were making their own charcoal to roast fish, cassava, and peanuts, as well as for baking. During this meeting we realized that this is an ideal group for GoSol’s SOL5 hybrid baking oven/roaster model. As they were running diverse entrepreneurial activities already before tapping into solar energy, we were sure they’d come up with many, many uses for their SOL5 so they can save money and stop using charcoal.

Tujijenge is a group of ten women and three men. They get all kinds of fresh foods, process them and sell them for a better price.
Teach a man to fish and he'll feed himself for a lifetime, they say. At GoSol we want all of humanity to have free solar energy.

And we were not disappointed: The group adopted the technology within the first two days. The men in the group grabbed wrenches to learn how to assemble and maintain the solar concentrator. Meanwhile, the ladies of the group gathered to discuss what uses they have for it. Baking was an obvious starting point, as they were already very experienced with it. But as they are also roasting, we are eager to return to the group soon and see what uses they have come up for the roasting drum!

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Update from Kenya: The SOL5 generates income
and supports the entrepreneurs

Posted Wednesday 12 October 2016 by Urs Riggenbach.

It is one thing to build and install the SOL5 solar concentrator, but it’s another one to use it. Knowing this, we did our best to train the two community businesses in Kenya where we’ve installed our SOL5 models in April/May. Now it has been four months since we’ve left Kenya, but with the usage reports we’re getting from the field we are confident to say: The SOL5 is used and useful, generates income, and supports the entrepreneurs.

SOL5 Pilot Field Data

Below are the key metrics of the field data generated over the last months. Much potential exists to improve these metrics, especially focusing around the issue of effective use that we’ll cover in another post.

SOL5 Roaster - Peanut Business

Metric Before After
Charcoal use / year 16 542 kg kWh 0 kg
Charcoal cost / year 803 € 0 €
Health Risks High risk No risk
SOL5 Roaster at the Yier Ngima Peanut Butter Cooperative.

SOL5 Oven - Bakery Business

Metric Before After
Electricity use / year 11400 kWh 3400 kWh
Electricity cost / year 990 € 297 €
CO2 emissions / year 6850 kg 2055 kg
SOL5 Oven at the Koptige Bakery.

Above are the key metrics from our pilots showing how much money the entrepreneurs save each month using the SOL5. In addition to the money, the businesses reported that they now produce more, at higher quality and with healthier working conditions.

More productive: The bakery was suffering from frequent power cuts. Sometimes it was impossible to bake without electricity, and sometimes an oven would stop working midway and the bread batch was lost. Now, with the SOL5 Oven, they do not depend on the unstable electricity grid anymore and are producing more.

Better quality: The roastery reported that with the SOL5 the peanuts do not get the smoky taste that they used to get with their previous charcoal roasters. Now, without the smoky taste they have a higher quality produce.

Better working conditions: When using charcoal and firewood as fuel, smoke is a big factor affecting worker’s heath. The ladies at the roasting business are pleased that there is no unhealthy smoke emission with the SOL5.


...And all of this while making monthly savings and reducing CO2 emissions.

More than ever are we convinced that GoSol’s SOL5 is a changemaker technology. Stay tuned!

Lady at Koptige Bakery taking out freshly baked muffins out of the SOL5 Oven installed in May 2016.

Predicting the Next Billion Solar Concentrators

Posted Thursday 11 August 2016 by Urs Riggenbach.

Solar concentration is going to change the world, period. There, we said it. And we want to make it very clear: Solar concentration will play a key role in providing energy access to the poor, reversing deforestation, and mitigating climate change. It will also play a key role in cross-cutting issues of gender equality, economic re-localization and resilience. Why are we saying this now? Because it is bound to happen, and a prediction can only be made before the fact.

What is solar concentration?

A solar concentrator bundles sunrays using mirrors to a focal point.

A solar concentrator is a machine that concentrates the energy of the sun. The concentrated solar energy is most often used directly as heat, or converted into other energy forms such as motion or electricity.

Solar concentrators have the potential to be powerful, cost-efficient and multi-use. As the technology makes direct use of free and abundant solar energy, it could rapidly spread cheap, renewable and sustainable energy access at a global scale.

The right kind of solar?

There are many solar concentrating systems out there, but GoSol’s suite of solar concentrators is unique in its price point, short payback period and high power output. In short, GoSol’s tech is a solution that bridges the gap between "not-powerful-enough" solar cookers and "too-large-to-be-feasible" industrial solar concentration fields in terms of small scale commercial processes. Until now the spectrum in between has largely been overlooked and to date no solution exists to power small-scale commercial activities so common across the developing world.

Charcoal baking oven in Kenya: Many commercial activities are run on charcoal.

Enter’s solar concentrator that provides energy at the small-scale commercial level at which today most of the world’s firewood and charcoal fuel is burned. No kidding: Just like two thirds of today’s food is still produced by family farmers and not industrial agriculture [1], it is thousands of millions of small entrepreneurs in the developing world that undertake much of today’s economic activity and share a significant proportion of global fuel consumption.

Because energy poverty strikes the small entrepreneurs the strongest, these entrepreneurs are not only limited in their productivity, but forced to use low quality energy sources that are more polluting, deforesting and greenhouse-gas-intensive as alternatives. Sustainable alternatives, such as photovoltaics, are still too expensive for most entrepreneurs that cannot cope with a 15 to 25 years payback time. In the developing world, energy poverty is the difference between using firewood or charcoal as opposed to using propane or coal; it’s not a choice between sustainable or not, but a choice between multiple unsustainable options.

To halt greenhouse gas emissions and deforestation, it is thus not only on industry to switch to cleantech, as millions of small entrepreneurs need to switch at the same time to renewable energy.

To have maximum impact on livelihoods and the climate, the right kind of solar should provide a viable solution to these entrepreneurs that pays back quickly and acts as a true upgrade to their current energy consumption habits. It has to be producible locally, maintainable locally, and make best use of locally available materials. It has to be scalable to suit different temperatures and power outputs, and adaptable to different use cases ranging from baking to roasting, cooking, pasteurizing, and so on. It is not an easy task but at GoSol we believe to be on the right track toward this game-changing solution.

How and Why to Spread a Billion Solar Concentrators ?

Local construction with artisans in Kenya.

We’re faced with several anthropogenic feedback loops that could cause total disaster if left unchecked. Conversely, a feedback loop of local solar development and innovation has the potential to scale faster than the problems we face and faster than any industrial solution. Though industrial renewable projects, when actually renewable, are good too, they are too capital intensive to scale globally in a short period of time.

One single GoSol SOL4 model replaces as much as 9 tonnes of wood per year. In many areas this can make the difference between the regeneration of the ecosphere or continued deforestation and eventual desertification.

One billion SOL4 solar concentrators would displace an amount of energy equivalent to all biomass burning today, radically reducing deforestation and pollution. One billion SOL4 solar concentrators would produce about 2,000 gigawatts which is roughly 4 times as much as all the nuclear energy being produced today.

OK, so who’s going to do this?

This energy transition is going to be a big win for all of us and making it happen will require a coming together of many stakeholders from diverse positions. This is why we’ve been bringing together diverse partners that can create the ecosystem needed to accomplish our vision.

At our mission is to eradicate energy poverty and minimize the damage of climate change by breaking down the barriers to solar energy access. We see it essential to bring our technology to its world changing potential in order to have true, rapid and holistic impact.

To get an idea of how we’re progressing, read more about our educational philosophy in our SolBook post, and watch the video of our Kenya project in cooperation with World Vision / Weconomy here .

Autodesk Foundation supports GoSol / Solar Fire

Posted Wednesday 3 August 2016 by Eva Wissenz.

Our team is very happy to announce that the Autodesk Foundation (USA) has committed to support our work with a USD 100,000 grant and a very exciting support program.

And here is what Autodesk’s team is saying about our work: "We’re impressed with Solar Fire’s design-driven approach to bringing commercial-scale solar thermal to Kenyan small businesses. A simple but powerful design + technical rigor + end user feedback = true impact."

The discussion with Autodesk team started months ago and in April they were able to go Kenya, meet with Lorin and World Vision team. They could check directly our work and after a few more phone meetings and intense questions/answers process they said "yes". It’s very important for us because our project is ambitious, as ambitious as the problem we want to solve, and Autodesk Foundation can connect us with important players, help us improve so many aspects of our work and we are going to learn a lot!

But first of all the support of Autodesk team enables us staying focused on impact and accelerating on the ground, starting in Kenya. We want to thank all our business partners, our first sponsors, all the members of the GoSol community, and all our families and friends who supported us and believed in our vision to spread solar energy among all.

SolBook: Preparing the Next Generation
of Solar Builders and Entrepreneurs

Posted Tuesday 2 August 2016 by Urs Riggenbach.

The SolBook is a resource for integrating’s empowering knowledge into school’s curricula. It will contain lessons on the physics, ecology, economics and entrepreneurial aspects of thermal solar energy. This book will take on the energy problem of today and makes it approachable for teachers and educational institutions that want to empower their students.

Breakthrough in Kenya with Weconomy / World Vision: GoSol's solar concentrators save money, time and energy.

What is the SolBook?

We want to create an educational textbook containing all the information needed for anyone to start using the power of the sun to save money, reduce pollution and to create a more sustainable planet.

The SolBook, available as Ebook, Paperback and Hardcover for pre-order is our approach for a rapid and massive distribution of knowledge on solar entrepreneurship. People who pre-order their SolBook help funding the creation of this book. The raised funds go directly into the production of the books as well as help fund our ongoing project in Kenya. Find out more on the SolBook page.

Education to solar energy is key

Education has the potential to equip the young generation with the vital tools they’ll need to fix the planet. At we are already sharing our DIY construction guides for 2 solar concentrators though membership.

Our partnership with Weconomy and World Vision allows us to potentially spread our knowledge in the over 90 countries where they work. We are getting many requests from educational institutions that want to teach solar. Now is the time to respond and create the educational material needed to empower the next generation of solar entrepreneurs. And we want to do this with you.

Why Now?

After reaching the technological breakthrough in baking, roasting and cooking, GoSol’s natural next step is to work with educational institutions to build up the capacity globally for solar entrepreneurship.

Even though there are many great tools out there for humanity to mitigate the globe’s ever increasing problems, it is still possible for young adults to grow up in today’s world not learning about centralized energy and how it’s affecting our planet.

Now enters the SolBook, an educational textbook containing all the information needed for anyone to start using the power of the sun to save money, reduce pollution and to create a more sustainable planet.

“Once the technological breakthrough is achieved, the real work only begins: the work of raising awareness and integrating an innovation into today’s society.”

Urs Riggenbach, Project Manager at

Consider pre-ordering your SolBook today, or tell a friend about it!

Achievement in Kenya: World Vision’s Video

Posted Tuesday 28 June 2016 by Eva Wissenz.

In this beautiful video you are invited to understand fully what we have achieved in Kenya with the cooperation of Weconomy and World Vision Kenya.

One month after the end of this first phase, the communities have adopted the tech even faster than we thought and the women would be very happy to train others on how to build their solar concentrators. Enjoy!

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