Iowa’s only nuclear power plant has been shut down for routine repairs. The Duane Arnould Energy Center near Palo was shut down Sunday. Workers are repairing the condenser tubes in the circulating water system. The plant’s manager says they’re doing the repairs now to ensure the plant is operating at full capacity during summer, when there’s peak demand for electricity. The plant is jointly owned by Alliant Energy/Interstate Power and Light, the Central Iowa Power Cooperative and the Corn Belt Power Cooperative. The plant cranks out enough electricity every day to power 432-thousand homes.