Question: capacitors as special use batteries?

I recall from my hobbyist days that high-voltage capacitors can keep
a
charge for a significant amount of time, especially if they are cut-
off from the circuit subsequent to charging.

I'd like to know whether it might be feasible, from a technical and
cost-effectiveness standpoint, to use a large array of specially
designed capacitors to hold excess electricity from solar plants for,
say, periods of a week or more. This would be helpful to bridge gaps
caused by overcast weather, and for other purposes.

I know that there are potentially problems with dielectric breakdown
and leakage. On the plus side, such "batteries" could be charged and
discharged very quickly, as needed, and without the complications
involved in conventional batteries using chemical electrolytes.
.

Relevant Pages

  • Question: capacitors as special use batteries?
    ... I recall from my hobbyist days that high-voltage capacitors can keep a ... charge for a significant amount of time, ... designed capacitors to hold excess electricity from solar plants for, ... involved in conventional batteries using chemical electrolytes. ...
    (sci.electronics.components)
  • Re: Question: capacitors as special use batteries?
    ... charge for a significant amount of time, ... designed capacitors to hold excess electricity from solar plants for, ... involved in conventional batteries using chemical electrolytes. ... UltraCapacitor powered tool: ...
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  • Re: Question: capacitors as special use batteries?
    ... a charge for a significant amount of time, ... designed capacitors to hold excess electricity from solar plants for, ... involved in conventional batteries using chemical electrolytes. ... The energy stoage capacity per volume / weight is absurdly ...
    (sci.electronics.basics)
  • Re: Question: capacitors as special use batteries?
    ... charge for a significant amount of time, ... designed capacitors to hold excess electricity from solar plants for, ... involved in conventional batteries using chemical electrolytes. ...
    (sci.electronics.basics)
  • Re: Question: capacitors as special use batteries?
    ... charge for a significant amount of time, ... designed capacitors to hold excess electricity from solar plants for, ... involved in conventional batteries using chemical electrolytes. ...
    (sci.electronics.basics)