Complex sentence: More than 90% of all power consumed in Quebec is generated by hydroelectric dams, which have lower greenhouse gases emissions than thermal power stations and the low and stable rates charged by Hydro-Québec, the provincially-owned utility.
Split into simpler sentences: More than 90% of all power consumed in Quebec is generated by hydroelectric dams, which have lower greenhouse gases emissions than thermal power stations. Low and stable rates are charged by Hydro-Québec, the provincially-owned utility.