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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 1 <br /> Great River Energy—Proposed Combustion Turbine Addition <br />