It's probably a good idea to reduce your choices in terms of starting places.
I'll gather some data, create the appropriate visualizations in my head, and create a shorterned list of scenarios.
http://www.eib.org/attachments/pipeline/20080135_nts_en.pdfHellisheiđi Power Station:
- Underground pipes are vulnerable to disruption
- Above-ground pipes are vulnerable to disruption
- potentially unlimited geothermal power.
- geothermal fluids have poisoned all nearby groundwater supplies
- very harsh winters
- small and mostly close-knit icelandic population. Riots are less likely.
- invaders must cross the sea to get to you.
- Built up area isn't that large. But the compound sprawls because of pipeworks and pumping stations.
Dunnottar Castle, Aberdeenshire, Scotland
https://en.wikipedia.org/wiki/Dunnottar_Castle
- Fortress surrounded by steep cliffs
- Relatively remote and away from civilization
- Britain is a weapon restricted countryFort Sumpter, South Carolina
https://en.wikipedia.org/wiki/Fort_Sumter- Fortress surrounded by water on 3 sides
- the sea... shouldn't freeze over... for a while. And even if it does, the water levels might change
- Now a historical monument/museum
- historical bane was its difficulty of being supplied. Land access is easy to cut off. Fortress was supplied by sea while at war.
- Maybe ERRANT could run a fleet of boats to supply the fortress.
Alcatraz Island, San Francisco
https://en.wikipedia.org/wiki/Alcatraz_Island- Well fortified prison island
- zero land access, boats are compulsory
- larger land and builtup area than Fort Sumpter
- has its own (old) powerhouse and water tower
Monteriggioni, Italy, The tiny walled city from Assassin's Creed
https://en.wikipedia.org/wiki/Monteriggioni
- Tiny walled city, population 9165
- Economy is nearly non-existent