NZ Windfarms is seeking permission to replace 97 existing two-blade, 47-metre-high turbines with 30 new three-blade, 162-metre-high turbines.
Moving to a 50-year rotation makes marginal land a much more attractive proposition for forestry.
A preliminary study released today outlines what steps would be taken to remediate the smelter site if it closes at the end of 2024.
Fonterra's chief financial officer Marc Rivers said the co-op was still "looking at what our options are” when it came down to an initial public offering.