From Methane Leaks
to Carbon Capture
E4's emissions solutions address natural gas compression's two largest environmental challenges: fugitive methane emissions from compressor sealing, and CO₂ output from gas-driven prime movers.
The Problem — By the Numbers
Compression infrastructure is responsible for a disproportionately large share of oil & gas sector emissions. E4 targets the highest-impact sources directly.
Problem: Fugitive Methane from Rod Packing
Conventional rod packing allows process gas — primarily methane — to migrate along the compressor rod and vent to atmosphere. New packing leaks up to 60 CFH; worn packing can exceed 900 CFH. Across a large fleet, this represents enormous uncontrolled methane emissions.
Solution: Zero Methane Rod Packing
E4's externally pressurized dry gas packing injects nitrogen through porous media barriers, ensuring only pure nitrogen reaches atmosphere. Process gas never contacts the atmospheric side of the packing — reducing site methane emissions to zero from this source.
Problem: Oil & Methane from Piston Blow-by
Conventional piston ring designs allow both oil vapor and process gas to blow by the ring seal during compression cycles. This requires cylinder oiling systems, generates oil-contaminated gas streams, and contributes to fugitive methane emissions and unplanned maintenance.
Solution: Oil-Free Piston Seals
E4's porous media piston seal creates a gas-film barrier between piston and cylinder bore — eliminating oil lubrication entirely. No oil carryover, no oil-maintenance downtime, and no methane bypass through ring gaps. The frictionless non-contacting design reduces wear simultaneously.
Problem: Carbon Emissions from Gas-Driven Compressors
Large natural gas compressor stations powered by gas-fired engines emit substantial CO₂. Current practice vents exhaust to atmosphere. At a 15,000 HP station, this represents approximately 75,000+ tons/year of CO₂ with no current capture path.
Solution: Exhaust Carbon Capture System
E4's patented ECC system captures >99% of CO₂ from compressor exhaust using centrifugal cryogenic separation — no chemicals required. Supercritical CO₂ is discharged at 1,100–5,000 PSI for EOR or sequestration, generating 45Q tax credits of $60–85/ton under the IRA.
IRA 45Q Tax Credit Opportunity
Changes to the 45Q tax credit program under the Inflation Reduction Act significantly improve the economics of ECC deployment — with credits now applying to much smaller capture volumes.
| Parameter | Pre-IRA | Post-IRA (Current) |
|---|---|---|
| Minimum Capture Threshold | 500,000 MT/year | 12,500 MT/year |
| 45Q Credit — EOR | ~$35/ton | $60/ton |
| 45Q Credit — Sequestration | ~$50/ton | $85/ton |
| Annual Revenue (75K tons × $60) | — | $4.5M/year (EOR) |
| Annual Revenue (75K tons × $85) | — | $6.375M/year (Seq.) |
Note: Tax credit calculations are illustrative. Consult qualified tax counsel for specific project applications. E4 is not a tax advisor.
Tightening Standards Ahead
Reciprocating Compressor Rod Packing Standards
Emissions performance standards for rod packing at compressor stations — requires monitoring, reporting, and in some cases replacement of high-emission packing.
Expanded Fugitive Emissions Requirements
Expanded monitoring and control requirements for reciprocating compressors — increasing pressure on operators to demonstrate actual emissions reduction, not just compliance reporting.
Waste Emissions Charge
The Inflation Reduction Act introduces a federal methane waste emissions charge for large operators — creating direct financial exposure for facilities with uncontrolled fugitive methane emissions.
Colorado, California, New Mexico OGMP 2.0
Leading energy-producing states have adopted methane reduction frameworks ahead of federal timelines, creating earlier compliance obligations for operators in those basins.
Industry Validation
E4 technology has attracted active engagement from major operators and OEMs seeking real emissions reduction solutions — not paper compliance.
Innio / Waukesha
NDA in place. Innio/Waukesha committed $500,000–$700,000 for Axip component testing and pilot participation in the ECC system — the highest-value OEM validation commitment in E4's development program.
Southwest Research Institute
NDA in place for collaborative development. SwRI provides independent engineering expertise and test infrastructure for advanced energy and emissions technology validation programs.
National Fuel Gas
NDA in place. Reviewing pilot proposal for the ECC system field deployment at an active NFG compressor station — the planned first full-system field pilot generating CO₂ removal and efficiency data.
Occidental / Oxy Low Carbon
NDAs with both Occidental Petroleum and Oxy Low Carbon Ventures. Active meetings with Corporate Technical Staff and OLCV team — interest in Rotary Separator, Compressor Seals, and ECC technology.
Siemens Energy
Meeting with Director of Strategy & Business Development and technical team. Expressed interest in Compressor Seals and ECC technology for integration into Siemens' compressor station offerings.
Chevron Technology
Discussions underway with Chevron's Carbon Capture Technology Strategy Manager regarding ECC system evaluation and potential co-development or deployment at Chevron facilities.