In April of 2023, HDR Engineering, Inc. (HDR) completed a study that assessed feasible technologies for long-term management of municipal solid waste on the island of Kaua‘i. HDR was contracted to issue a letter of interest to technology vendors both locally and throughout the nation, and screen responses to determine whether respondents can offer established, emerging, or undeveloped systems, and how the proposed systems ranked on other performance criteria.

In addition to the above, the study provides an overview of various waste management technologies, identifies how technologies were screened, assesses the combined technologies, estimates technology costs, and provides conclusions and recommendations.As a next step, the study recommends a formal, cost-competitive, two-stage Request for Proposal (RFP) be issued to interested parties.