Plot of the electricity generation at Kawerau. Half-hourly data are grouped daily and plotted as magenta (max-upper quartile), green (min-lower quartile), red (median), pale blue (daily average) stepwise dark blue (weekly average), black step (annual averages), black line (overall average). Data from the Electricity Commission/authority and Gnash (available through https://www.dropbox.com/scl/fo/ybht00jahx8mzto4jrzkk/h?rlkey=jyosqn7mp34vqyf40s4triub6&dl=0), and plotted via Octave and a screengrab because print -dpng (or svg) damages both the on-screen image and the resulting .png file. The spike is due to a single value of 6·774MW at 3pm on Friday 25/7/2003 and is possibly a data error. But see the lesser spike of 6·278MW 8:30am Thursday 26/8/2004. Data end with March 2008 (though the power stations continue) because the Electricity Commission re-contracted some services, and failed to include in them the ongoing supply of data at many generation sites.

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