The city of Watertown is not suffering from a lack of spending needs. For about five years, officials have discussed buying a ladder truck to serve as a backup to the Fire Departmentâs two aerial trucks. A 2004 ladder truck would cost $1.4 million. The city is looking at using a purchasing co-op rather than going through the usual bidding process. Members of the City Council heard Monday from representatives of Wendel Energy Services about possibly replacing half of the windows in City Hall and installing indoor and outdoor LED lighting at city-owned properties. This could save Watertown more than $3 million over 25 years. Proceeding with this plan would cost the city $2,054,839, with an interest rate of 2% over 20 years â resulting in a âa cumulative net positive cash flow of $1,287,335â over the long haul, according to the energy audit presentation.