Wind power capacity in Canada is expected to increase from 400 MW in 2004 to 3.5 GW in 2010 and 8.5 GW in 2020, says a long term supply and demand outlook released by Natural Resources Canada (NRCan), a government department. By 2020, wind will represent 6% of Canada's generating capacity and 3.6% of total electricity production. Almost half of the increase in renewable energy capacity expected over the outlook period will be driven by the expansion of wind generation, the report says. NRCan's projections may be low, however. Purchase plans and targets now in place in Canadian provinces total nearly 10,000 MW by 2015.