b. Preliminary cost-benefit analysis of the investments into the two alternative renewables. This will be done for the most populous island of Oahu and take the form of comparing the NPV from economic appraisals for generating 75% of the total projected energy needs of the island over 30 years. The expectation is that solar would be cheaper, but this is disputed, especially accounting for all the environmental and sociocultural externalities if incorporated into the economic appraisal