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#736
Kauai electricity customers face rolling blackouts; utility urges energy conservation
"This was never clearer than during last week’s islandwide outage and the days that followed.
KIUC has 209.9 megawatts of generating capacity, more than half of which is renewable: a combination of solar (utility scale and distributed), biomass and hydropower. So when two of our three largest diesel generating units failed, why didn’t renewables pick up the slack? With 118 megawatts of generating capacity, our renewables should have been able to carry Kauai’s 75 megawatt peak load.
The answer is as simple as lack of sunshine. The bulk of our renewable generating capacity available on demand comes from battery energy storage systems (BESS) at the Tesla and AES Lawai solar facilities.
On a sunny day, while renewable energy sources are often producing enough power to meet 90 percent, or more, of the island’s power needs, these BESS systems are busy storing more than 150 megawatt hours of electricity for later use.
The problem is when the sun doesn’t shine these solar energy resources provide minimal output, and our hydropower and biomass facilities can meet only a fraction of our load.
So while we strive on a daily basis to maximize our use of clean, renewable power – which by the way is less expensive than diesel — we must also face the reality that when the sun doesn’t shine or the water doesn’t flow, our renewables need a backup.
Reliable and low cost renewable generating resource options that do not rely on solar are limited for our island."
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