Acorn,
To help you.
Erratic= unpredictable ,inconsistent , uncertain .
Hence wind farms generally produce over time about 30% of their much vaunted and much quoted capacity .
At the moment storage is much too expensive and not energy dense enough to make wind energy inexpensive .
With coal we could produce at $25 dollars or less per MwHr.
Wind has a starting subsidy of $70 MwHr as well as production costs.
No wonder SA and Vic. prices rocketed when hazelwood and Playford b (SA ) demolished.
