Anything is achievable legally, if you become the government.
From:
http://www.labour.org.nz/nz-power
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"Hydroelectric power makes up almost two-thirds of our electricity, and it costs next to nothing to generate because it uses free water and dams that were paid off years ago. But when this electricity is sold on the market, the companies get paid the same amount as other generators using more expensive methods, like gas."
"Labour’s Solution
Labour will create a new agency called NZ Power will act as a single buyer of wholesale electricity. It will also have the power to set prices."
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SNOOPY