Hawaii’s march to 100% adds 260 MW solar + 1 GWh storage


From pv magazine USA

In 2015, Hawaii passed legislation requiring electricity providers to generate 100% renewable energy by 2045. A year and a half later, multiple islands reported that they would hit 100% renewable energy long before 2045 – Moloka’i by 2020, and all of the islands – when taking into account customer generation – sometime in the 2030s. And for good measure, last winter island leaders gathered to pledge to also transition ground transportation to 100% renewable energy by 2045.

In a rapidly changing electricity paradigm, Hawaiian Electric Companies (HECO) still has a role to play, and wants in on the action.

HECO reports that it is in negotiations for long term power purchase agreements with developers on seven unique projects spread across three of the islands.

The project specifics are:

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  • On O‘ahu, three projects totaling approximately 120 MW and 515 megawatt-hours (MWh) of storage
  • On Maui, two projects totaling approximately 75 MW and 300 MWh of storage
  • On Hawai‘i Island, two projects totaling approximately 60 MW and 240 MWh of storage

If the projects are in the now industry standard of 1:4 ratios of MW to MWh, then we’d have MW ratings approximately equal to the amounts of solar power being produced at the peak level. This makes sense as the island chain as a whole is over 10% of total electricity from solar power, and daytime production has already led to major changes in net metering and energy storage requirements.

Just yesterday, Maui publicized a 2.87 MW project selling its electricity at 11.06¢/kWh. This project will replace electricity purchased from a fossil fuel plant at 17¢/kWh. Last year, AES Corp and the Kauai Island Electric Cooperative announced a 28 MW solar plus a 20 MW / 100 MWh (note the five hour duration) energy storage system that charges 11¢/kWh.

In Hawaii, we have the laws, we have the projects and we have the finance. Now we get the show.

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