using the proceeds of the sale of these businesses trustpower began purchasing the generation assets being shed by those energy companies that had opted to be a lines company. this led to it purchasing the following hydro power stations and schemes: arnold, branch and waihopai, kumara, mangorei, motukawa, paerau, patearoa, patea (for $72m) wahapo, waipori (for $70m) as well as the tararua wind farm (for $49m). thus by march 1999 it had 421.5 mw of installed capacity, capable of generating up to 1,769 gwh per annum.