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Conversion to electrical could be accomplished through a small DC motor or small generator attached to the output shaft in place of the fan. Based on the discharge rate of the stored energy in the videos though I wouldn't count on getting very much per run. The output needs to have a stronger gear ratio to slow the conversion of energy. Adding a weight could increase the stored energy although would require a stronger input (more wind) and once again requires a stiffer gearing ratio on output to slow it down.