The deadline for proposals is 21 July.

They will include engineering, procurement, construction, testing, commissioning and performance verification.

The utility says ongoing growth of both wind and solar energy on Oahu requires energy storage capability to help ride through sudden changes in availability of both intermittent sources. It also notes that more than 11% of its customers now utilize rooftop solar.

When power supplied by these resources drops suddenly, energy storage systems could help maintain reliable service and avoid customer outages as fast-starting firm generation units are brought online.

Energy