Near New Haven there is the static inverter plant of the HVDC Cross Sound Cable. There are <answer>three</answer> PureCell Model 400 fuel cells placed in the city of New Haven—one at the New Haven Public Schools and newly constructed Roberto Clemente School, one at the mixed-use 360 State Street building, and one at City Hall. According to Giovanni Zinn of the city's Office of Sustainability, each fuel cell may save the city up to $1 million in energy costs over a decade. The fuel cells were provided by ClearEdge Power, formerly UTC Power.
How many PureCell Model 400 fuel cells can be found in New Haven?
three