produce electricity. After that, the steam drops into a main condenser where it is condensed to liquid water and is recycled. A secondary loop of water which enters the tube side of the condenser is non-radioactive. It flows to two large cooling towers which stand tall where the hot water is cooled by natural circulation with ambient air. This is a closed loop with only a small amount of make-up water needed from Lake Erie to replace any evaporation. Two 345 kV lines send power to the customers. Those same lines are used to supply electricity to the site's safety equipment. Three additional 120 kV lines are also available to supply any needed back-up power to safety equipment. Additionally, four diesel generators and four combustion turbine generators are on site to power plant safety equipment during an emergency. Fermi 3 The original Fermi 3 project was to be a companion unit identical to Fermi 2. It was ordered in 1972 and cancelled in 1974. See DOE data page 67 and WNA Fermi 3 data. In September 2008, Detroit Edison filed an application with the Nuclear Regulatory Commission (NRC) for a Combined Construction and Operating License (COL) for a third reactor. The new unit is supposed to be built on the same site, slightly to the southwest of Fermi 2. The reactor design selected is the 1,550 MWe GE-designed passive Economic Simplified Boiling Water Reactor (ESBWR). Review of the 17,000-page application could take four years, after which construction could take six years. The cost is estimated at as much as $10 billion. CEO Anthony Earley said that DTE's analysis "so far shows that nuclear power will, over the long term, be the most cost-effective baseload option for our customers, ... We expect nuclear to remain the low-cost option, but we will continue to evaluate nuclear against other resources and will commit to proceeding with construction only at the right time and at the right cost". In March 2009, a coalition of citizen groups asked federal regulators to reject plans for Fermi 3, contending that it would pose a range of threats to public health and the environment. The groups have filed 14 contentions with the NRC, claiming that a new plant would pose "radioactive, toxic and thermal impacts on Lake Erie's vulnerable western basin." In May 2015, the NRC approved a combined construction and operating license for Fermi 3, but DTE