The Franklin Heating Station — the power behind the Mayo Clinic’s reliable daily operations — was due for an upgrade to continue delivering the optimal utility service it’s known for.
Detailed permits and a phased construction schedule for new boilers and a centralized control room are paving the way for efficient project execution while maintaining full hospital operations and, in turn, world-class care.
Looking to modernize its operations, the Mayo Clinic in Rochester, Minnesota, hired our team to draw up a robust utility master plan that included an upgrade to its Franklin Heating Station (FHS). Originally built in 1928, FHS has long been providing steam, chilled water and electricity to the downtown Rochester campus. Currently, the FHS is equipped with four 50-year-old steam boilers that range in size from 70,000 to 120,000 pounds per hour (PPH) of capacity with pressure/temperature conditions of 400 psi/750°F and 850 psi/900°F. But for the plant to remain reliable, Mayo Clinic officials opted for the replacement of all boilers and centralization of the facility’s control rooms, merging the two into one.
Our team led the clinic through the entire permitting process to obtain the required Prevention of Significant Deterioration (PSD) minor amendment permit, issued by the Minnesota Pollution Control Agency (MPCA). The permit needed to state that Mayo Clinic could provide maximum operating flexibility while also maintaining continuous reliable power throughout construction. To put that language into practice, we performed a PSD netting analysis for each boiler replacement, which examined multiple upgrade options and identified permit requirements for each unit. Our team determined that three 120,000 PPH boilers at 850 psi/900°F steam conditions — one field erected, two packaged — would fit within the existing space, replaced seamlessly using a phasing construction plan. Clinic officials agreed.