It works for me.
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Pamela81I can assure that the electricity will be available during the night as wellYou need I can assure you that .... Otherwise, the sentence is fine. You can certainly use available in that context.
Pamela81do you mean that it makes sense ?Yes -- and that the usage is correct, natural, and common.
AvangiI'm not sure whether or not he considers the sentence incorrect without it.I do.