- Marshalltown Generating Station
We provided environmental permitting assistance to Interstate Power and Light (IPL) for its 600-MW (nominal) electrical generating facility near Marshalltown, Iowa. The Marshalltown Generating Station has two F-class combustion turbines in combined-cycle mode. The facility combusts natural gas and is adjacent to IPL's existing coal-fired power generation station.
Our efforts included gathering all required preconstruction environmental permits, clearances and authorizations and additional general assistance. The preconstruction permits include Prevention of Significant Deterioration (PSD) and Title IV Acid Rain. The approvals and general assistance work included a noise study, a traffic impacts study, state and federal threatened and endangered species approval, wetland delineation efforts, submittal of the applicable wetland permit application, cultural resource approval, and Federal Aviation Administration notifications. In addition, our team assisted IPL with the preparation of documents and studies that supported the necessary Iowa Utilities Board (IUB) application process (for a certificate for the construction of the electric power generation plant). The two certification processes, for what is provided to the IUB, consisted of the Generator Facility Certificate (GCU) and the Ratemaking Principles Certificate (RPU). We also provided expert testimony and review of the client's expert testimony to support the application effort.
The PSD air permit application included a full PSD analysis for particulate matter (PM10, PM2.5), carbon monoxide (CO), volatile organic compounds (VOC), sulfuric acid (H2SO4), carbon dioxide (CO2), greenhouse gases, and nitrogen oxide (NOx) emissions. This included a Best Available Control Technology (BACT) analysis for these pollutants as well as an air dispersion modeling analysis including refined modeling for several pollutants.
Our team also provided permitting assistance for a 13-mile natural gas pipeline providing fuel for the plant. The natural gas pipeline interconnects with two existing natural gas pipelines (Northern Border Pipeline Co. and Northern Natural Gas).
The pipeline permits and approvals we completed included a Joint Permit Application for the Section 404 and 401 permit (for wetlands), threatened and endangered species habitat assessments for necessary clearances (federal and state), cultural resources studies submitted for the necessary clearances, and the floodplain development permit/approval/clearance. For the required IUB public meeting (associated with the pipeline), we supported the client to proactively address environmental questions.
- PSD air permitting
- Generator facility certificate (GCU) assistance
- Ratemaking principles certificate (RPU) assistance
- GCU and RPU expert testimony support
- Threatened and endangered species studies
- Cultural resources approval
- Federal Aviation Administration notifications
- Wetlands permitting
- GIS services
- Noise monitoring and modeling study
- Floodplain development permit/approval
- Public meeting assistance