Before we know it, summer will be here... Along with its sweltering temperatures and high humidity. And that means hundreds of millions of air conditioning systems will power up across the U.S. That will send seasonal electricity use surging. To meet those demands, utilities and independent power producers must fire up more than 1,000 natural gas-fired peaker power plants. As their name indicates, peaker plants run only during periods of very high demand. Peak demand periods are infrequent, and that's a good thing. Peaker plants cost a fortune to start up and run. Therefore, the power they make costs a lot too. That's why utilities don't use them unless they absolutely have to. These plants are also generally inefficient. And they emit large amounts of greenhouse gases when running. As a result, utilities are increasingly retiring them and replacing them with lithium-ion battery storage systems. Just a few years ago, those systems were too expensive to install and run. But today, that's no longer the case. The contest is over. And battery storage has won. Batteries Are BetterThe cost of electricity produced by battery storage systems has dropped 50% in just the last two years. They're faster, more flexible and 30% cheaper than even the best gas turbines. Battery storage has rapidly become the choice of peak energy generation. This is even more apparent in the results of a study on the levelized cost of electricity from Australia's Clean Energy Council. The levelized cost of electricity measures the lifetime cost of an energy source divided by its lifetime electricity production. The study considered three sources: a 250-megawatt gas peaker plant, a 250-megawatt two-hour battery plant and a 250-megawatt four-hour battery plant. It found that the levelized cost of electricity delivered by the two-hour and four-hour batteries were 17% and 30% less, respectively, than that of the gas peaker plant. Even the best gas peaker plants can take 15 to 30 minutes to respond to an urgent call for power. In order to avoid blackouts, utilities must run them longer than needed. |
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