Blue Hydrogen Consulting
A&A Consulting Services for CO₂ Storage, CO₂-EOR, and 45Q Tax-Credit Qualification for Blue Hydrogen Projects — Steam Methane Reforming (SMR), Autothermal Reforming (ATR), and Underground Gasification — Worldwide
Assign your Blue Hydrogen project's CO₂ storage, CO₂-EOR, and 45Q tax-credit qualification work to A&A, and let the high-level, seasoned CO₂-storage consultants of the A&A Consulting Team put decades of hands-on CO₂ and subsurface experience to work for you, around the world.
Hydrogen is typically categorized by how it is produced, using an informal "color" nomenclature the industry has settled on. "Grey" hydrogen is produced from natural gas or coal by conventional reforming or gasification, with its process CO₂ vented to the atmosphere. "Blue" hydrogen uses the same natural gas or coal feedstock, but captures that process CO₂ and stores it permanently underground, substantially reducing its net greenhouse-gas footprint. "Green" hydrogen is produced by electrolyzing water using renewable electricity, with no direct process CO₂ emissions. As of 2025, the International Energy Agency's Global Hydrogen Review reports that less than 1% of global hydrogen production is low-emissions (blue or green) — more than 99% is still produced from unabated fossil fuels — and blue hydrogen is generally the lower-cost, faster-to-scale low-emissions pathway available today, since it builds on decades of proven natural-gas reforming and CO₂ capture and storage technology rather than requiring new electrolyzer manufacturing capacity and additional renewable generation. That combination of scale, cost, and proven technology is why "blue" hydrogen production — using Carbon Capture, Utilization, and Storage (CCUS) — is emerging as an important strategy for reaching net-zero greenhouse gas emissions by mid-century, and represents a substantial business opportunity.
Avasthi & Associates, Inc. (A&A) is an independent petroleum engineering and geoscience consulting firm. A&A does not sell reforming, carbon-capture, or storage equipment, or hydrogen products — our only business is expert technical consulting, which means A&A's Blue Hydrogen recommendations are never influenced by a stake in any particular technology, vendor, or offtake arrangement.
A&A's technical expertise on Blue Hydrogen projects is on the subsurface side — CO₂ storage, CO₂-EOR, underground gasification, and underground hydrogen storage — not surface process engineering. A&A does not design or engineer hydrogen production process equipment (SMR or ATR reactors), carbon-capture process equipment, hydrogen transport systems, or hydrogen storage surface facilities (compression, liquefaction, or ammonia conversion) — for that scope, your project's process licensor or EPC contractor is the right partner, and A&A is well positioned to work alongside them. If your company needs CO₂ storage, CO₂-EOR, underground gasification, underground hydrogen storage, or 45Q tax-credit qualification support for a Blue Hydrogen project, please contact us — the high-level, seasoned consultants and subject-matter experts (SMEs) of the A&A Consulting Team, and collaborators, are available to help your company, around the world.
Related A&A Service: This page is one of nine services under A&A's broader energy transition practice — for A&A's full energy storage, hydrogen, ammonia, lithium, and geothermal service directory, please see A&A's Energy Transition & Decarbonization Consulting page.
1. Blue Hydrogen Production Pathways
A Blue Hydrogen project's production pathway determines the volume, concentration, and location of the CO₂ that must ultimately be captured and stored — which is why it matters to A&A's storage-planning work, even though A&A does not design or select production-process equipment. The three main pathways are:
• Steam Methane Reforming (SMR): the most widely deployed reforming technology, producing CO₂ in two streams — a concentrated process stream and a more dilute flue-gas stream — which affects the CO₂ volume and purity a storage project must plan for
• Autothermal Reforming (ATR): combines reforming and partial combustion in a single reactor, producing one concentrated CO₂ stream rather than two, which is why ATR is increasingly favored for new-build, high-capture-rate projects
• Underground Gasification of Coal or Other Fossil Fuel Resources: producing syngas — and, from it, hydrogen — by gasifying a coal or other fossil-fuel resource in place underground, rather than mining or extracting it first. This subsurface pathway draws directly on A&A's own hands-on underground gasification expertise, and, paired with CO₂ capture and storage, is a distinct blue-hydrogen production pathway particularly suited to deep or otherwise unmineable coal resources
Related A&A Service: For A&A's full underground gasification consulting services — including A&A's own hands-on Underground Coal Gasification (UCG) pilot-test experience — please see A&A's Hydrogen Production by Underground Gasification of Fossil Fuel Resources page.
2. CO₂ Capture Rate and Its Effect on Storage Design
Whichever production pathway a project selects, the carbon-capture technology and target capture rate chosen — commonly in the 55%–95%+ range, depending on configuration — has a first-order effect on the CO₂ volume A&A's storage design and 45Q tax-credit qualification work must plan for. A&A does not design or select the capture technology itself (for example, a Selexol/Rectisol pre-combustion system or an amine-based post-combustion system) — that scope belongs with your project's capture-technology licensor or EPC contractor. A&A's services on the capture-adjacent side are limited to:
• Storage-Scope and 45Q Planning Around Your Capture Rate: helping your company understand how the capture configuration and target capture rate your project selects determines the CO₂ volume A&A's storage design and 45Q tax-credit qualification work must plan for
• CO₂ compression, dehydration, and transport design from the capture point to the storage or CO₂-EOR site
• 45Q tax-credit qualification support, and Monitoring, Reporting, and Verification (MRV) plan design
3. CO₂ Storage Methodologies
Once captured, a Blue Hydrogen project's CO₂ needs a permanent geologic home. A&A's dedicated CCS/CCUS Consulting practice provides the full site characterization, well design, and regulatory support for the geologic storage settings a Blue Hydrogen project might use, including:
• CO₂ Storage in Depleted or Depleting Oil and Gas Reservoirs: for enhanced oil recovery (EOR) or enhanced gas recovery (EGR) combined with CO₂ geosequestration
• CO₂ Storage in Deep Saline Formations: for dedicated, large-capacity CO₂ geosequestration
• CO₂ Storage in Unconventional Formations: shales, coal beds, and basalts, as an emerging CO₂ storage option
Related A&A Service: For A&A's full CCS/CCUS consulting practice — site screening, injection engineering, well design, and MRV — please see A&A's CCS/CCUS Consulting page.
Related A&A Service: For A&A's dedicated site characterization and storage-performance modeling for a depleted or depleting oil and gas field, please see A&A's CO₂ Storage in Depleted / Depleting Oil and Gas Fields page.
Related A&A Service: For A&A's dedicated site characterization and storage-performance modeling for a deep saline formation, please see A&A's CO₂ Storage in Deep Saline Formations page.
4. Produced Hydrogen Storage
When there is no immediate market for produced hydrogen, project developers typically evaluate storing it — commonly in solution-mined salt caverns or a depleted gas reservoir for later production as Hydrogen-Enriched Natural Gas (HENG), or by converting it to ammonia for cryogenic storage. The subsurface side of that decision — storage-site characterization, cavern or reservoir engineering, and injection/withdrawal well design for salt cavern or depleted-reservoir hydrogen storage — is squarely within A&A's petroleum-engineering and geoscience scope; the ammonia-conversion and cryogenic-storage pathway is a surface process decision that is not.
Related A&A Service: For A&A's full underground hydrogen storage engineering services — salt cavern and depleted-reservoir storage-site characterization, cavern/reservoir engineering, and injection/withdrawal well design — please see A&A's Underground (Subsurface) Gas Storage Consulting page.
Related A&A Service: For more on the ammonia-conversion storage pathway, and A&A's CO₂ storage services on the ammonia side, please see A&A's Blue Ammonia Consulting page.
5. Project Development and Technical Advisory
• Technical and Economic Feasibility Studies: preliminary and detailed feasibility studies covering CO₂ storage-setting selection, CO₂-EOR evaluation, and 45Q tax-credit economics
• Investor-Grade Technical Due Diligence: independent technical due diligence on the CO₂ storage, CO₂-EOR, and 45Q tax-credit aspects of a Blue Hydrogen investment, for investors, partners, and lenders
• Environmental and permitting evaluation for CO₂ storage and CO₂-EOR operations
• Risk assessment and mitigation planning
Software and Technical Tools
The high-level, seasoned consultants of the A&A Consulting Team are expert users of the industry-standard software and technical tools used for state-of-the-art CO₂ storage and CO₂-EOR studies supporting Blue Hydrogen projects, including:
• CMG-GEM / CMG-STARS: for CO₂ injection, storage, and coupled reservoir simulation
• Petrel: for 3D geological and reservoir modeling of storage and production reservoirs
• PHREEQC: for subsurface geochemistry relevant to CO₂ storage
• Python and MATLAB: for techno-economic modeling and data analytics
Deliverables
The high-level, seasoned consultants of the A&A Consulting Team deliver decision-grade technical and commercial intelligence for the CO₂ storage, CO₂-EOR, and 45Q tax-credit side of complex Blue Hydrogen projects, including, but not limited to:
• A CO₂ storage-setting screening and site-characterization study, or a CO₂-EOR feasibility evaluation
• Simulation-driven storage-performance and injection-well design
• A well-by-well Class II/Class VI integrity assessment and regulatory-compliance plan
• An MRV plan ready for regulatory submission
• 45Q tax-credit qualification documentation, and high-quality final reports and executive presentations
To put the high-level, seasoned consultants and subject-matter experts (SMEs) of the A&A Consulting Team, and collaborators, to work on your company's Blue Hydrogen project's CO₂ storage, CO₂-EOR, or 45Q tax-credit needs, around the world, please contact us.
Frequently Asked Questions
What is the difference between grey, blue, and green hydrogen?
Grey hydrogen is produced from natural gas or coal with its process CO₂ vented to atmosphere. Blue hydrogen uses the same feedstock but captures and permanently stores that CO₂ underground. Green hydrogen is produced by electrolyzing water using renewable electricity, with no direct process CO₂ emissions.
Does A&A design or engineer hydrogen production or carbon-capture equipment?
No. A&A's technical expertise on Blue Hydrogen projects is on the CO₂ storage, CO₂-EOR, and underground gasification side. A&A does not design SMR or ATR reactors, carbon-capture process equipment, or hydrogen storage and transport systems — for that scope, your project's process licensor or EPC contractor is the right partner, and A&A is well positioned to work alongside them on the storage and 45Q side of the project.
Is blue hydrogen really lower-carbon than grey hydrogen?
Yes, when the capture technology and rate are properly designed. Blue hydrogen production captures a substantial share of the process CO₂ that grey hydrogen production vents to atmosphere — commonly 55%–95%+ depending on the reforming technology and capture configuration selected — and permanently stores it underground. A&A's storage and 45Q tax-credit consulting is built around the CO₂ volume that capture configuration produces.
Does A&A have experience with underground gasification as a Blue Hydrogen production pathway?
Yes. A&A's consultants bring hands-on Underground Coal Gasification (UCG) pilot-test experience dating back to the 1970s — please see A&A's Hydrogen Production by Underground Gasification of Fossil Fuel Resources page for A&A's full underground gasification consulting services.
Does A&A sell reforming, carbon-capture, or storage equipment?
No. A&A is an independent petroleum engineering and geoscience consulting firm and does not sell reforming, carbon-capture, or storage equipment, or hydrogen products, so A&A's recommendations are never influenced by a stake in any particular technology, vendor, or offtake arrangement.
