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Concept Review <br />Project Narrative <br />Great River Energy <br />Proposed Combustion Turbine Addition <br />1. Detailed description/scope of project <br />1.1. What is being proposed? <br />Great River Energy is proposing to install a combustion turbine (CT) to replace the Elk River Energy <br />Recovery Station's (ERERS) 49 megawatts (MW) of generating capacity. This proposed project will <br />enhance the reliability of electric power supply for the families and businesses in the Elk River area. <br />With the shut down and demolition of the ERERS waste combustor facility, Great River Energy has until <br />June 2022 to use the existing interconnection rights of the original ERERS facility to connect another <br />generating source to the Midcontinent Independent System Operator, Inc. (MISO) transmission system. <br />If we do not install and interconnect the replacement capacity by then, we will lose the existing <br />interconnection rights. <br />The proposed combustion turbine will have a generating capacity of 49 MW or less. We are currently <br />evaluating two vendors for the combustion turbine. Just like the existing 200 MW (nominal) combustion <br />turbine already located on the Elk River campus, the proposed new unit will be fueled primarily with <br />natural gas or with distillate fuel oil for backup. At this time, we believe the existing fuel oil storage tank <br />will be sufficient, so additional tanks will not be needed. The existing natural gas infrastructure feeding <br />the campus is sufficient for the proposed project, but Great River Energy will need to make <br />modifications to the gas supply system within the campus. <br />We are considering two potential locations for the combustion turbine: 1) east of the existing 200 MW <br />combustion turbine, or 2) within the existing Refuse -Derived Fuel (RDF) Barn. These locations are shown <br />in Figure 1. <br />The proposed combustion turbine has a smaller footprint and a shorter profile than the existing <br />combustion turbine because of its lower generating capacity. Figure 2 shows an approximate footprint <br />relative to the existing combustion turbine, and Figure 3 shows an example picture of one model being <br />considered. <br />The proposed combustion turbine will not operate continuously like the former ERERS. The existing <br />200 MW combustion turbine typically operates between 150 to 500 hours per year. We believe MISO <br />will run the proposed combustion turbine similarly to the existing 200 MW combustion turbine and not <br />likely more than 900 hours per year. <br />Project Narrative <br />Great River Energy — Proposed Combustion Turbine Addition <br />