Del. Code tit. 15, § 7303

The Governor shall issue writs of election to the Department reciting the vacancy and commanding the Department to cause an election to be held in its county on the day mentioned in the writ, at the place by law prescribed for holding the general election in its county, for choosing a Representative in place of the Representative whose seat shall so have become vacant, which writ shall be delivered to the Department at least 60 days before the day therein appointed for holding the election.