Trractor runs using vine pruningsA Marlborough wine producer has successfully converted a tractor to run on a completely free, renewable biofuel - its own vine prunings. The New Zealand Wine Company, which produces the Grove Mill label, decided in early 2008 that the rising cost of diesel warranted a look at other options. It commissioned a prototype tractor to run through 'gasification' - a process where biomass is partly combusted to create a gas which can be used for fuel. The tractor was successfully converted, proving that it's both possible and practical to power vineyard tractors on the natural by-product of growing vines. Diesel use reduced by 75% and CO2 emissions by just over 0.35 tonnes per hectare, per year - which would equate to 42 tonnes of CO2 per year over the vineyard's 120 hectares. Between the start and end of the trial the cost of diesel dropped, meaning it's currently more economic to use diesel - but the vineyard has a proven 'escape route' from high fuel prices when they rise again in future. NZWC has a company ethos of sustainability, and its Grove Mill winery was the first to achieve carboNZero Cert TM certification. The winery worked with Vine Gas Ltd on the tractor prototype, a company set up to promote the use of gasification as a fuel for vineyards. |
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