Maui's largest solar project OK'd by PUC

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2. Here you go...

https://www.nrel.gov/docs/fy17osti/68960.pdf

Timescales of Energy Storage Needed for Reducing Renewable Energy Curtailment

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5 Conclusions

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Our modeling shows that the amount of VG curtailed is a function of wind and PV generation patterns and the size of energy storage deployed. Overall, our results suggest that relatively short-duration energy storage might offer an effective path to integrating VG at penetrations up to 55%. Across all the mixes of wind and solar resources analyzed, at least half of the potential avoided-curtailment benefits are realized with 8 hours of storage, and the first 4 hours provide the largest benefit. A 4-hour duration also offers a relatively high capacity value, which is critical to the economics of storage. Cost improvements might make storage with durations of 6 or even 8 hours viable, but there appears to be little value in deploying very-long-duration or seasonal storage at VG penetrations up to 55%.

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