Vt. Const. art. II, § 19

[Powers of Senate; Lieutenant-Governor’s duties] The Senate shall have the like powers to decide on the election and qualifications of, and to expel any of, its members, make its own rules, and appoint its own officers, as are incident to, or are possessed by, the House of Representatives. A majority shall constitute a quorum. The Lieutenant-Governor shall be President of the Senate, except when exercising the office of Governor, or when the office of the Lieutenant-Governor shall be vacant, or in the absence of the Lieutenant-Governor, in which cases the Senate shall appoint one of its own members to be President of the Senate, pro tempore. And the President of the Senate shall have a casting vote, but no other.