A wood pellet heating system that warms four buildings in Yellowknife has, after a year of operation, helped its biggest client — the territorial government — cut oil-use by 92 per cent. J&R Mechanical, a local plumbing and heating contractor, turned the 390-kilowatt system on in mid-March last year. It heats two of the business's buildings and a vet clinic. But half of its capacity goes into heating one structure: the territorial government's central warehouse on Byrne Road.