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I actually think Hawaii could be the first place where renewables could be the cost effective solution. The trade winds are fairly consistent and sunlight plentiful year round. They've got moderate temperatures that don't fluctuate much day to day or seasonally...
If everyone drove EVs (as anyone on an island should), the utility could develop V2G and there'd be plenty of storage.
A quick google search says the average Hawaiian household consumes 18.5 kWh per day. A fully charged 60 kWh EV could provide 3 days worth of household consumption assuming zero help from solar / wind.
Building big expensive centralized power plants on each island seems less efficient than distributed wind / solar.
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