Alliant Energy ~ Marshalltown Generating Station

Marshalltown, Iowa

Project Description

The Marshalltown Generating Station is a 650 MW 2 x 1 combined cycle natural gas-fueled power plant owned by Interstate Power & Light (Alliant Energy). This plant consists of two Siemens 501F gas turbines (SGT6-5000F, 230 MW each), two Nooter Eriksen HRSG’s and one Siemens steam turbine (SST6-5000). Construction began in the fourth quarter of 2014 and the plant went online the fourth quarter of 2016. This facility includes a full building enclosure of the STG, CTG’s and HRSG’s to allow the owner better year-round equipment maintenance and winter cycling abilities.

Boldt’s scope of work included:

  • Building layout

  • Forming, pouring and finishing of all concrete

  • Erection of all structural steel

  • Rigging, unloading and storage of materials and plant equipment

  • Rigging engineering

  • Installation, alignment and grouting of centerline equipment

  • Erection and weld out of HRSG’s

  • High pressure HRSG interconnection piping

  • Installation, alignment and grouting of balance of plant equipment

  • Supply of all cranes over 100 ton

Learn more about our work in the energy market.

Architect/Engineer

KBR

Boldt's Role

General Construction, Prime Subcontractor

Key Points

  • The construction of this facility will allow the owner better year-round equipment maintenance and winter cycling abilities.