SynCH4 Project Overview

provide corn stover

Minimum Feedstock Delivery – 60 Tons Per Day

earn revenue through EPA & CA credits

Robust Benefits – RNG sales, RFS and LCFS Credits yield IRR in mid-teens

from biomass to natural gas

Commercial Ready Gasifier, Gas Clean Up and Methanation technologies.

potentially lower your carbon footprint

Dry Mill plants could be eligible for exothermic heat from methanation to minimize CO2 footprint of ethanol.

Realistic Commitment


Feedstock delivery based on 20 members:

  • Daily Feedstock Delivery is 60 Tons Per Day.
  • At 85% capacity annual feedstock delivery is 8615 tons.
  • With 20 members, the annual delivery/member is 930. Daily delivery is 2.5 tons per day.
  • Assuming round bales @ 1200 pounds and 1.67 round bales per ton, daily delivery per member is 4.25 round bales.
Technology to Produce Methane

How it works

Basic technology package:

  • Standard Indirect Gasifier 6 MWth 30 Tons per Day Feedstock
  • Gasifier to Syngas.
  • Syngas clean-up.
  • Two gasifiers feed methanation unit.
  • Syngas through multi-stage methanation to pipeline quality methane.
Project Benefits


Projects will be co-located at existing dry mill ethanol plants, which use corn as feedstock, and potentially use exothermic heat plus natural gas as fuel to produce ethanol.

Stover, a poor quality feed supplement, is under utilized. A fraction is left on fields and used as cover. The remainder is unused and can cause run-off problems.

This project would provide a new commercial use for 60 TPD of stover and produce RNG + provide exothermic heat.

  • Dry mill plants would be offered heat from methanation to replace natural gas use and reduce the CO2 ‘footprint’, of ethanol.

  • SYNCH4 offers minimum storage requirements, a fair price for delivered feedstock, and zero CO2 per MMBTU natural gas replacement.

The Takeaway

The Takeaway

Critical Size

Millenna runs efficiently with 29 tons per day input or 60 tons per day for the package including methanation.

Conversion Efficiency

Total efficiency from biomass BTU input to CH4 output is 70%.


High output will minimize basic OpEx: Feedstock Cost/MMBTU output.

Minimum Disposal Cost

Process will result in clean ash for disposal.

Improve the CO2 Footprint

Dry mill plants can use exothermic heat from methanation to reduce natural gas use and potentially improve the CO2 footprint of ethanol.

Project Financial Support

Renewable natural gas will qualify for RFS and LCFS trade-able permits.

Project Pipeline

Project Pipeline

Proposal is to form alliance with a major engineering firm active in dry mill plant development. Plants can either be standalone or sold on a turnkey basis to dry mill plants.

AWE and partners would then develop a Project Pipeline.

Geographic area Feedstock Time Frame
Mid West Corn Stover 10 years

SYNCH4 would support project finance from:

  • RNG sales

  • Permits from the RFS and LCFS

  • Capture of Exothermic heat for use in Dry Mill plant.
    Initial plants in Nevada and NY could use waste wood.

Co-location offers feedstock, interconnection with gas pipeline, and an improvement for the CO2 profile of dry mill plants.



For more information, including a CIM, contact:

George Sterzinger