Carbon Capture Costs: FEED & pre-FEED Cost Reports

ION Clean Energy, with Nebraska Public Power District, is conducting a FEED study to retrofit a CO₂ capture system on Unit 2 of the 700 MWe Gerald Gentleman Station in Nebraska. Using ION’s low-aqueous ICE-21 solvent, proven in prior DOE-funded projects to reduce energy use, solvent degradation, and emissions, the design will feature two parallel 350 MWe capture units. The project aims to decarbonize most of Unit 2 while maintaining maximum operational flexibility for the plant.

This report summarizes Trimeric’s Phase II work under the SSEB ECO2S project in Kemper County, Mississippi, focused on Task 7 – Infrastructure Development. Trimeric evaluated CO₂ compression and dehydration costs, compared pumping versus compression for dense phase CO₂, and developed pipeline transport cost estimates. Using experience from past projects, screening-level designs and cost estimates were prepared for a nominal 1 MTPY case and scaled to site-specific conditions. Results showed that increasing discharge pressure modestly raises costs, with pumping offering slight savings and operational flexibility but added complexity. Pipeline costs were estimated using NPC benchmarks, while compression and dehydration costs were scaled for Plant Daniel, Plant Miller, and Kemper. Overall, capital costs were roughly three times equipment costs, with electricity for compression as the dominant operating expense. The costs are associated with 8-stage compression to 1,500 psig

Membrane Technology and Research Inc., with Technology Centre Mongstad, Dresser-Rand, Trimeric Corporation, and WorleyParsons/Advisian, is scaling up its advanced Polaris™ membranes for post-combustion CO₂ capture and testing them at engineering scale at TCM in Norway. The Polaris membranes, about 20 times more permeable than prior commercial versions, use a patented selective recycle design to boost CO₂ concentration in flue gas and lower capture costs. The project will design, build, and operate a modular membrane system for a six-month field test, including performance verification, steady-state operation, techno-economic updates, and integration studies with advanced compression technology.