Councillors voted unanimously to accept the deal.
"One of the main goals of our plan is to reduce our green house gas emissions so we're leading by example," said Coun. Rob Lantz.
Bullfrog Power has purchased energy from the West Cape Wind Farm to supply its customers.
While taxpayers will pay two cents more per kilowatt-hour for electricity at city hall, Lantz said it will be a financial wash because the province is reducing electricity rates by about 14 per cent. Holly Bond, Bullfrog's director of sales and marketing for eastern Canada, said the company will also work with the city to reduce energy use.
"They're going to be paying a little bit more for their electricity," said Bond.
"But once we start engaging the employees in city hall, let's see how much we can reduce their electricity bill by."
The one-year deal includes an energy audit, as well as conservation seminars for both employees and the public.