I'm always interested in how islands are powered. Shetland is not connected to the National Grid so there is a power station in Lerwick. The details are here. Shetland has a population of 23000. At say 3 people per house on average that might be about 8000 households. I found this data on power use per household. It says the old rule of thumb was 1000 households per MW. This is from the 1970s and American. It says that was later updated to 750 households per MW. This would mean that Shetland would need a capacity of 10MW for domestic use. It sounds as though Sullom Voe oil refinery has its own power station. Not sure how much industry would use but it seems that the 66MW nameplate capacity on the power station is good.
