Unlike oil, natural gas and electricity, coal consumption has remained relatively steady. Abrupt increases in its use (like that seen in the early 2000s) are a result of its use for electricity generation. This affects the percentage used by different sectors. In 2007 the amount used for power generation was 65% of the total. In a very dry year, when hydroelectric generation is reduced, the percentage used for generation and the overall amount increase.
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Source: Ministry of Economic Development; New Zealand official yearbook, 1990