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Macrogrid study: Big value in connecting America's eastern and western power grids:
Those seven threads (technically, they're back-to-back, high-voltage, direct-current connections) join America's Eastern and Western interconnections and have 1,320 megawatts of electric-power handling capacity. (The seam separating the grids runs, roughly, from eastern Montana, down the western borders of South Dakota, Nebraska and Kansas and along the western edges of the Oklahoma and Texas panhandles. Texas, with its own grid, is mostly outside the two big grids.)
And they are big grids -- the eastern grid has a generating capacity of 700,000 megawatts and the western 250,000 megawatts. So, up to 1,320 megawatts isn't much electricity moving between the two.
But what if there were bigger connections between the two grids? What if more power moved back and forth? Could that move Iowa wind power, Southwest solar power and Eastern off-shore wind power from coast to coast? Could the West help the East meet its peak demand, and vice versa? Would bigger connections boost grid reliability, resilience and adaptability? Would the benefits exceed the costs?
The short answer: Yes.
That's according to the Interconnections Seam Study, a two-year, $1.5 million study launched as part of a $220 million Grid Modernization Initiative announced in January 2016 by the U.S. Department of Energy.
[...] "The results show benefit-to-cost ratios that reach as high as 2.5, indicating significant value to increasing the transmission capacity between the interconnections under the cases considered, realized through sharing generation resources and flexibility across regions," says a summary of the latest paper.
"So, for every dollar invested, you get up to $2.50 back," said James McCalley, an Iowa State Anson Marston Distinguished Professor in Engineering, the Jack London Chair in Power Systems Engineering and a co-author of the papers.
How much would you have to invest? McCalley said it would take an estimated $50 billion to build what researchers are calling a "macrogrid" of major transmission lines that loop around the Midwest and West, with branches filling in the middle and connecting to Texas and the Southeast.
Journal References:
1.) Aaron Bloom, Josh Novacheck, Gregory L. Brinkman, et al. The Value of Increased HVDC Capacity Between Eastern and Western U.S. Grids: The Interconnections Seam Study, (DOI: 10.1109/TPWRS.2021.3115092)
2.) Armando L. Figueroa Acevedo, Ali Jahanbani-Ardakani, Hussam Nosair, et al. Design and Valuation of High-Capacity HVDC Macrogrid Transmission for the Continental US, (DOI: 10.1109/TPWRS.2020.2970865)
(Score: 2, Interesting) by khallow on Tuesday November 23 2021, @01:47PM
Cool story, bro, but it's just not that hard to build interconnects that go nowhere near populated areas or charismatic wilderness. There's the assertion in the story that "the benefits exceed the costs". But what's missing is that there's a lot of cost, and just not that much benefit. The article here reminds me of those vendor contractors who are paid to show you that you need their business products.
If we really were looking at such a great ROI, then why aren't the businesses who built the present interconnects, building more such? Answer: they've figured out the costs and benefits on their own.
Finally, just how much generation capacity is there really? That 1320 MW of connection is 24 hours with more uptime than even a well-run nuclear plant. 1000 MW of solar power, for example, gets chopped by crudely a factor of three or four (or more, if it's in cloudy regions) when it's averaged over a whole day.
It strikes me that a better approach is to come up with demand that can be fired up when electric power is cheap - for example, cryptocurrency mining.