bc hydro's last dam was completed in 1984, since then run-of-the-river projects with private partners have been built. power production without reservoirs varies dramatically though the year, so older dams with large reservoirs, retain water and average out capacity. as of 2012 there were approximately 40 small hydro sites generating 750 mw. by 2014 various companies have built a total of 100 run of the river projects under 50 mw. in 2014 they produced 18,000 gwh from 4,500 mw of capacity.