Oahu Wind Integration Study (OWIS) conducted by the Hawaii Natural Energy Institute at the University of Hawaii at Manoa, General Electric and the Hawaiian Electric Company found the following:

• Using state-of-the-art wind power forecasting to help anticipate the amount of power that will be available from wind.
• Increasing power reserves to help manage wind variability and uncertainty in wind power forecasts;
• Reducing minimum stable operating power of baseload generating units to provide more power reserves
• Increasing ramp rates (the time it takes to increase or decrease output) of Hawaiian Electric’s thermal generating units
• Implementing severe weather monitoring to ensure adequate power generation is available during periods of higher wind power variability
• Evaluating other resources capable of contributing reserve, such as fast-starting thermal generating units and load control programs.

Translation:  Although wind will provide significant energy, HECO will need to have back up fossil fuel plants to meet peak load requirements.  See the full OWIS study here