Start-ups from the UK, Estonia, the Netherlands and the United States will compete for grand prize of €500,000

Green start-ups from the Netherlands, Germany, Great Britain, Norway and Sweden, the countries with a Postcode Lottery, can once again secure a place in the final of the Postcode Lotteries Green Challenge.

Dutch Postcode Lottery gives five green start-ups a chance to break through with annual competition

A €500,000 financial injection. This is what is at stake in the Postcode Lottery Green Challenge, one of the largest annual international competitions in the field of sustainability innovation. LettUs Grow from the UK, Reverse Resources from Estonia, AlgiKnit from the USA, and The Great Bubble Barrier and AquaBattery from the Netherlands are the five start-ups that have reached the finals and will compete for first prize.

On 13 September, they will present their business plans to an international jury, the press and the public in Amsterdam, the Netherlands. During the final, it will be announced which start-up will go home with the grand prize of €500,000. The runner-up will receive €200,000. The other finalists will win €100,000 each.

Remarkably, four of this year’s five finalists are younger than 30. Below, you will find a description of the five finalists..

Air bubble curtain to battle plastic soup
Female sea sailor Anne Marieke Eveleens (29) is co-founder of the Dutch start-up The Great Bubble Barrier, from Amsterdam. Approximately 80% of the plastic floating in the oceans enters the sea via rivers. In order to tackle plastic soup, The Great Bubble Barrier has developed an air bubble screen for use on riverbeds that catches plastic before it arrives at sea. The Great Bubble Barrier sends high-pressure air through a perforated tube on the riverbed. This creates an air bubble curtain that blocks both the stream of plastic waste on the surface and the floating microparticles underwater. The plastic then floats to the waterfront along the air bubble curtain, where it is collected for recycling.

Storing renewable energy in water and kitchen salt
TU Delft spin-off AquaBattery has developed an energy storage system that works on the basis of water and table salt instead of rare, and therefore expensive, raw materials. Because no chemical reaction is required to store and release energy, this innovation offers a sustainable solution for storing energy that has been won from renewable resources, such as wind and solar energy. The non-toxic composition and scalability of the ‘Blue Battery’ make this energy storage system also suited for urban areas. Being able to sustainably store the increasing amounts of renewable energy is crucial to the transition to sustainable energy. Emil Goosen (29), co-founder of AquaBattery, will represent the start-up at the final.

Seaweed textile
Tessa Callaghan (26) is co-founder of the American start-up AlgiKnit. This company makes fibres from kelp (a type of seaweed) that can be spun into yarn. By using biomaterials, AlgiKnit offers a solution that could transform the highly polluting textile industry into a circular economy. After having been used, this seaweed textile can serve as compost or animal feed. It also reduces the carbon footprint of the clothing industry, because no harmful fibre particles are lost during washing, such as is the case with polyester. The company is working on a prototype of a T-shirt and sneakers will be next.

Growing crops in the mist
British start-up LettUs Grow is represented by co-founder Charlie Guy (25). One third of the global carbon emissions can be traced back to our food production processes. As a result of the increasing global population, emissions are increasing even further and farmland is becoming scarce. Vertical urban farming offers a solution. This is a type of agriculture where stacked cultivation layers are used in factory halls or empty office buildings. By making use of vertical space, the yield per square metre is higher than with traditional agriculture. LettUs Grow has developed a unique growing method for this type of cultivation. Contrary to methods where crops are grown in soil or water containers, LettUs Grow lets the roots hang in a dense, nutritious mist. This results in a better harvest, and significantly less water and energy consumption. Also, by growing the crops closer to the consumer, the carbon emissions caused by transport decrease as well.

Recycling marketplace for the textile industry
Ann Runnel (36) from Estonia is founder of the Reverse Resources start-up. Reverse Resources is a software platform for the clothing industry’s recycling process. Using the platform, clothing manufacturers can directly align their supply of waste textiles with textile recyclers. This allows textile recyclers to gain better insight into the quality of the waste flows, and will result in a decrease in the demand for new fabrics (-3%), as well as in wasted textiles (-20%) in factories. Until now, this was impossible and many waste textiles remained unused. As a result, they were eventually incinerated. The platform also offers a solution for mapping and tracing waste textiles from the textile and clothing production process.

The finals will be held in Amsterdam on 13 September
The finals will be held at the Gashouder venue in Amsterdam on 13 September 2018 and can be watched via livestream at

Last year, the Rwandese start-up EarthEnable won the €500,000 first prize with their sustainable alternative to cement.