Net metering is no longer supported in Hawaii, Several different programs have been implemented that are more profitable for the utility. As a result, without batteries and self-supply it is no longer nearly as cost-effective to install solar even at $0.35-0.50/kWh. The utility will only buy at ~$0.10 and sell at 3-5x that rate.

https://www.greentechmedia.com/articles/read/rooftop-solar-i...

https://www.hawaiianelectric.com/clean-energy-hawaii/produci...