{"id":4828,"date":"2026-07-15T15:58:53","date_gmt":"2026-07-15T15:58:53","guid":{"rendered":"https:\/\/greentrust.nl\/?p=4828"},"modified":"2026-07-15T15:59:21","modified_gmt":"2026-07-15T15:59:21","slug":"greentrust-is-exploring-an-energy-solution-for-de-leistert","status":"publish","type":"post","link":"https:\/\/greentrust.nl\/en\/2026\/07\/15\/greentrust-is-exploring-an-energy-solution-for-de-leistert\/","title":{"rendered":"From a coffee shop to a sustainable energy company"},"content":{"rendered":"\n
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From a coffee shop to a sustainable energy company<\/strong><\/strong><\/h1>\n\n\n\n

\u201cJust go ahead and build that thing.\u201d Back then (2015), Lieuwe couldn\u2019t have known that those few words would, twelve years later, grow into a company with sixty colleagues both at home and abroad. And no, this story isn\u2019t about GreenTrust, but about Volta Energy: the developer of sustainable solar power generators.<\/strong><\/p>\n\n\n\n

\u201cOn my way to school, I would always pass fields where diesel generators were roaring, even when no work was being done,\u201d says Roel Bleumer, founder of Volta Energy. \u201cThere has to be a better way, I thought at the time. So, as part of my mechanical engineering program, I drew a design for a solar panel mounted on a trailer. During a career fair, I decided to present my idea.\u201d <\/p>\n\n\n\n

As it happened, Klaas and Lieuwe from GreenTrust were there that day. Roel got to talking with Lieuwe about a familiar pain point: even at wind farm opening ceremonies, a diesel generator sometimes had to be set up to provide electricity for things like the coffee machine. \u201cThat was indeed a bit of an embarrassing issue,\u201d Lieuwe laughs. \u201cBut that\u2019s exactly why I was immediately intrigued. After all, how logical would it be if we could power our own opening ceremonies with green energy? Of course, we would have preferred to use electricity directly from the turbines, but unfortunately, it\u2019s not that easy to just plug something in there.\u201d <\/p>\n\n\n\n

After the meeting, Roel\u2014then a 19-year-old student\u2014was invited to GreenTrust\u2019s break room. There, he heard the words that set everything in motion: \u201cGo ahead and build that thing.\u201d <\/p>\n\n\n\n

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The first Volta on a trailer behind Roel Bleumer’s car<\/figcaption><\/figure>\n\n\n\n

GreenTrust covered the cost of the materials, after which Roel had the parts delivered to his parents\u2019 shed. There, he welded together the very first prototype of Volta. \u201cThe first test was scheduled to take place during an opening party at Windpark Roosendaal,\u201d Roel says proudly. \u201cAfter that, GreenTrust would be able to rent the solar power unit for other events. I have to admit, though, that the solar panels cracked on the way to Roosendaal. Apparently, you can\u2019t just transport glass solar panels on the highway. But it worked. The coffee machine and other important components could be plugged in just fine during the opening. That was truly the official launch of Volta.\u201d <\/p>\n\n\n\n

\"Volta
The first Volta in use during an event at the Roosendaal Wind Farm<\/figcaption><\/figure>\n\n\n\n

That first project immediately yielded valuable lessons. What worked? What could be improved? What can you actually transport? And how do you make a sustainable alternative to a diesel generator that\u2019s also practical, reliable, and scalable? In the years that followed, there was hard work, lots of testing, and just as much laughter. Volta developed various models: foldable, with or without a trailer, battery-powered, and motor-driven. \u201cThis year, we built our 500th Volta,\u201d says Roel. \u201cWe now have models ranging from 6 to 120 kVA. Our systems are hybrid, which means they only kick in when electricity is actually needed. That saves a tremendous amount of energy.\u201d <\/p>\n\n\n\n

For Lieuwe, it\u2019s great to see how an idea from a student presentation has grown into a fully-fledged company. \u201cThis is exactly what the energy transition is all about: just getting started, testing, improving, and scaling up. It\u2019s great that GreenTrust was able to contribute to this development from the very beginning. And it\u2019s even more wonderful to see everything Volta Energy has achieved since then.\u201d <\/p>\n\n\n\n

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Volta at Roosendaal Wind Farm: Coffee Powered by Green Energy<\/figcaption><\/figure>\n\n\n\n

Volta Energy has a clear goal: to replace diesel generators in the Netherlands with sustainable alternatives as much as possible. It\u2019s a goal we\u2019re happy to help achieve. So, are you looking for a generator for a construction site, a project location, or an event? Then be sure to consider Volta. <\/p>\n\n\n\n

The existing grid connection is not large enough to accommodate that growth. GreenTrust was therefore commissioned by Recreatiepark de Leistert and the Zuidenwind and Leudal Energie cooperatives to investigate whether nearby wind farms could help ensure that De Leistert continues to have a sufficient power supply in the future. <\/p>\n<\/div>\n\n\n\n

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From a coffee shop to a sustainable energy company \u201cJust go ahead and build that thing.\u201d Back then (2015), Lieuwe couldn\u2019t have known that those few words would, twelve years later, grow into a company with sixty colleagues both at home and abroad. 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