How forestry slash can become a positive resource

31 Mar 23

Our Stories
Slash has huge potential to be used as biofuel when salvaged, recycled, and repurposed.

Cyclone Gabrielle has had a devastating impact on Aotearoa, bringing major concerns to the fore about climate change and forestry management. The news reports from February will stay long in the memory, particularly the huge volumes of slash that contributed to our worst floods this century. As managing slash becomes an urgent nationwide issue, one company has devised a solution that can turn the problem into a positive.

Forestry and timber company OneFortyOne is a business with a plan — to turn New Zealand’s unwanted forestry slash into biofuel. According to the business, slash has huge potential to be used as biofuel when salvaged, recycled, and repurposed. The biofuel made from slash can also help organisations move away from coal and fossil fuels to cleaner energy sources, it says.

Based in the Nelson, Marlborough and Tasman regions at the top of the South Island, OneFortyOne recognises that slash can cause significant environmental problems. The business is on a mission to harness classic Kiwi ingenuity and turn unwanted waste into a fuel source that can power communities into a cleaner future.

Removing binwood reduces the amount of slash, which significantly decreases the potential damage in the event of intense weather events.

OneFortyOne collects binwood, the larger pieces of slash measuring over 600mm long and 100mm wide that don’t meet the required log grades or dimensions for sawmills or pulp mills. After salvaging the wood from skid sites, OneFortyOne stores it in safe storage sites across its estate. The binwood is then dried over many months. Once moisture content is at the right level, it can be chipped and used as an energy source.

Since November 2021, OneFortyOne has invested almost $500,000 into its binwood collection project, accumulating 15,000 tonnes of wood. That’s enough to fill 405 logging trucks or cover two rugby pitches piled three metres high. Not an insignificant amount.

The slash initiative requires meticulous care and attention. The removal of wood has to be balanced with wise management of soils and slopes, and enough biomass has to be left on the slopes to provide nutrients for future planting. The extraction of logs and binwood must also be done in a way that prevents erosion of the slopes until the next rotation of trees is established.

Removing binwood reduces the amount of slash on-site post-harvest, which significantly decreases the likelihood of skid failures and potential damage by slash in the event of intense weather events, such as Cyclone Gabrielle.

OneFortyOne’s binwood collection project delivers an energy source that can help NZ businesses move away from coal and has removed 15,000 tonnes of slash from our forests. The group is keen to work with industries across the country to reduce the impacts of slash and mitigate climate change by embracing biofuels that are less damaging to our environment.

The timber business initiated this project because it believed it needed to continually look for ways to improve how slash was managed, it also knew it had a valuable product that was previously only viewed as a problem.

Replacing fossil fuels with bioenergy alternatives can help New Zealand meet its greenhouse gas emission targets and create new opportunities for the local economy. The business says the project, when scaled up, could be a game-changer for New Zealand in creating a sustainable, endlessly renewable source of bioenergy.

As it looks to the future and further innovation to help the environment, OneFortyOne is ready to work with other organisations to reduce the impact of slash, prevent climate damage, and turn a negative into a positive. The business is on the lookout for partners to collaborate on slash reduction and mitigate the genuine threat of climate change.

For more information and to collaborate with OneFortyOne NZ, email Kylie Reeves,

OneFortyOne acknowledges the Traditional Custodians of Country throughout Australia and their deep connections to land, water, and community. We pay our respect to Elders past and present and extend that respect to all First Nations people today.

In Aotearoa New Zealand, Māori communities have a strong spiritual connection between people and the land – the wellbeing of one sustains the wellbeing of the other. We strive to build meaningful relationships with iwi as tangata whenua (people of the land/region), to be responsible intergenerational kaitiaki (stewards/guardians) of the land where our forests grow.