KIUC RFP for Energy Storage/Dispatchable Renewable Energy

Posted: March 3, 2014 - 19:50 / FOA-RFI-RFP

KIUC is seeking energy storage solutions that can help solve the significant challenges that come with high penetration of the intermittent energy sources described in the Introduction. Chief among these challenges are increasing periods of over-generation and extreme variability.

KIUC is actively pursuing solutions to enable further solar penetration. At the end of 2013, the island of Kauai had over 26.4 MWdc (21.1 MWac) of solar in service, with 17.3 MWdc of customer-side PV (9.3 MWdc being 10 kW or less) and 9.1 MWdc of centralized, utility-scale PV. Solar accounted for over 5% of Kauai’s annual electricity production in 2013.

KIUC’s grid is a true islanded system with a typical daytime electrical demand of 55-65 MWac. With 21.1 MWac of solar PV in service, solar contributes as much as one-third of Kauai’s daytime demand during periods of clear sun. KIUC continues to offer programs that enable residential and commercial members to install solar systems, and as of early 2014 there is another 10 MWdc in the interconnection queue. KIUC is also building two separate 14+ MWdc (12 MWac) utility-scale solar projects that are expected to come online in 3Q 2014 and 1Q 2015.

Following commercial operation of the second project, Kauai will be getting over 16% of its annual electricity from solar, with 80-95% of the daytime demand provided by solar during periods of clear sun. This will create a significant challenge: maximizing the contribution of low-cost solar, maintaining the ability to take output from existing energy-only renewable energy PPAs, and keeping the absolute minimum conventional generation online in order to maintain grid reliability, specifically frequency control.