Page "Superconducting magnetic energy storage" Paragraph 30
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Whether HTSC or LTSC systems are more economical depends because there are other major components determining the cost of SMES: Conductor consisting of superconductor and copper stabilizer and cold support are major costs in themselves.
Other components, such as vacuum vessel insulation, has been shown to be a small part compared to the large coil cost.
The combined costs of conductors, structure and refrigerator for toroidal coils are dominated by the cost of the superconductor.
We expect to see a cheaper cost for HTSC due to lower refrigeration requirements but this is not the case.
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