Between 1914 and 1915, the Mond Nickel Company, now I.N.C.O., built a dam at Nairn Falls on the Spanish River. Due to the effects on the economy after World War I there had been an increased demand for nickel from the Sudbury Basin .
The Nairn Falls dam had a considerable effect on the flow of water down river to Lake Huron. The Nairn Falls Power Plant (or Huronian Power Plant) is still providing power for I.N.C.O. who sells some to Ontario Hydro.
The Nairn Plant used to employ 4 steady men and 1 holiday relief, but is now downsized to men working out of High Falls Plant. For quite a few years there was a small townsite up hill of the plant. It consisted of two 3 bedroom houses, rented out to INCO workers and a much larger one called the Club House. This Club House was where a cook and family lived and boarded the maintenance men of the plant.