New Zealand survived a tight electricity supply situation on Friday morning - the 12th so far this year.  

It happened after Transpower warned the residual quantum of electricity available for use was sinking towards the 200 megawatt danger mark between 7 am and 9 am. 

In the end, the 200 megawatt level was not breached, and even if it reached zero, unused reserves would still be available.

But it is a predicament that keeps Transpower on constant alert, which it warned about in May and again a month later. 

This subject and other energy problems are the subject of the latest interest.co.nz Of Interest podcast.  

*You can find all episodes of the Of Interest podcast here.