Marshalltown, IA

Biogas Generator Replacement 2016

  • Client City of Marshalltown
  • Type Wastewater
  • Services Evaluation, Design
  • Project Manager Lance J. Aldrich, P.E., BCEE


One of the city’s two biogas engine-generators permanently failed. It was 40 years old and would require more money to fix than it was worth ($1/4M). Sizing a new engine-generator had very little to do with the parameters of the existing engine-generator. The Performance Edge Project reduced the city’s need for capacity.


This project, which is currently underway, started with a study in 2014 to evaluate alternatives for repairing one of the two 40-year old biogas co-generators that recently had a major failure. After reviewing alternative technologies, Marshalltown elected to replace the old unit with a new 300 to 350 kW co-generation engine.

IMG_4122 crop