Πηγή: Petersen, J. 2019. CAISO Data Highlights Critical Flaws In The Evolving Renewables Plus Storage Mythology.
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The fundamental problem of renewable power is intermittency.
I’ve always been amazed at a strange mental disconnect that’s common among renewable power advocates. On one hand, they freely acknowledge that industrial societies can’t function without stable power grids to supply electricity on demand, 24 hours a day, seven days a week, 365 days a year, and with 99.999% reliability. On the other hand, they insist that we have a moral duty to use non-dispatchable, intermittent, and generally unreliable power from renewables despite the fact that intermittency is the mortal enemy of a stable electric grid. The electrons from wind turbines and solar panels may be green and squeaky clean, but their intermittent electric current is the grid equivalent of sewage in a mountain stream.
According to the California Independent System Operator, or CAISO, the biggest challenge of managing a greener grid is maintaining a precise balance between supply and demand as the percentage of intermittent power from renewables increases. To meet the challenge, CAISO is working overtime to develop a fleet of flexible power resources with the capacity to:
Sustain upward and downward ramp;
Respond for a defined period of time;
Change ramp directions quickly;
Store energy or modify energy use;
React quickly to meet expected operating levels;
Start with short notice from a zero or low-electricity operating level;
Start and stop multiple times per day; and
Accurately forecast operating capability.
While the contract price for green electricity from a wind- or solar-farm may be cheaper than the contract price for electricity from a conventional power plant, the downstream cost of making green power stable, reliable, and useful in the electric grid can be immense, which is why electricity in states that have implemented renewable portfolio standards is often more costly than it is in states that haven’t implemented RPS programs.
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