"Increasingly, coal in that region (Waikato) is becoming more difficult to locate and more expensive to mine, limiting the nation’s ability to rely on the resource for its energy supply." Again, it is an economical decision that prompts the two coal-fired plants to shut down by 2018. In turn, there will be more coal for NZ to export to China.... Burgeoning geothermal, solar, and wind energy operations will readily fill any energy void that the coal fired plants may leave behind. Let's hope the environment also benefits on a large scale!