Energy Transition & Decarbonization Consulting
A&A's Subsurface-First Energy Transition Practice — Energy Storage, Critical Minerals, Hydrogen, Ammonia, Underground Gas Storage, Geothermal, and Industrial Decarbonization — Worldwide
Avasthi & Associates, Inc. (A&A) provides energy transition and decarbonization consulting for oil and gas companies and energy investors navigating the shift to a lower-carbon future — helping clients reduce greenhouse gas emissions from existing operations, and evaluate and develop the lower-carbon energy projects that build on their subsurface skills and assets.
Our perspective is distinctive: A&A approaches the energy transition as petroleum engineers and geoscientists. The same subsurface disciplines that produced hydrocarbons for more than a century — reservoir characterization, well engineering, injection design, and monitoring — are precisely the skills that make long-duration energy storage, geothermal energy, brine-hosted lithium, and low-carbon hydrogen and ammonia possible.
Avasthi & Associates, Inc. (A&A) is an independent petroleum engineering and geoscience consulting firm. A&A does not sell energy-storage, electrolyzer, drilling, or process equipment, and holds no equity in any technology or project — our only business is expert technical consulting, which means A&A's energy transition recommendations are never influenced by a stake in any particular vendor, technology, or project.
Decarbonization Strategies Grounded in Engineering, Not Slogans
A credible decarbonization strategy for an oil and gas company must do three things: reduce greenhouse gas emissions from current operations, capture value from carbon management and low-carbon energy opportunities, and build real options in lower-carbon energy — all while sustaining the core business that funds the transition. A&A helps clients answer questions such as:
• Which of our depleted reservoirs, saline aquifers, and salt caverns qualify for CO₂ storage, hydrogen storage, or compressed-air energy storage — and what are they worth as subsurface energy assets?
• Which lower-carbon energy projects — geothermal, lithium, hydrogen, ammonia, or long-duration storage — genuinely fit our subsurface positions, infrastructure, and capabilities?
• Where do our own legacy and orphan wells, and our produced water streams, create emissions liability, and where do they create monetizable opportunity instead?
• What technical and economic case can we bring to investors, lenders, and regulators for a first-of-a-kind low-carbon energy project?
A&A's Energy Transition & Decarbonization Consulting Services
A&A's energy transition practice is organized into nine consulting services, grouped below into four categories — each with its own dedicated page describing A&A's methodology, project experience, and deliverables in depth:
Long-Duration Energy Storage
1. Energy Storage Assessment and Development Consulting
Subsurface and thermal energy storage — geothermal heat storage (GeoTES/UTES), aquifer and borehole thermal energy storage (ATES/BTES), mobile thermal energy storage (MTES), and hybrid renewable-storage integration — for utilities, industrial hubs, and data-center developers seeking long-duration heat storage.
2. Underground (Subsurface) Gas Storage Consulting
Natural gas storage, underground hydrogen storage, and compressed-air energy storage (CAES) in salt caverns, depleted reservoirs, and saline aquifers — storage-site characterization, cavern/reservoir engineering, injection/withdrawal well design, and well-integrity due diligence, the mechanical and chemical long-duration storage counterpart to A&A's thermal energy storage practice.
Hydrogen & Ammonia Value Chain
3. Blue Hydrogen Consulting
CO₂ storage, CO₂-EOR, and 45Q tax-credit qualification support for blue hydrogen projects — hydrogen produced from natural gas or coal by steam methane reforming (SMR) or autothermal reforming (ATR), paired with carbon capture and permanent geologic storage of the process CO₂.
4. Hydrogen Production by Underground Gasification of Fossil Fuel Resources
Converting coal and other fossil-fuel resources into syngas — and, from it, hydrogen — in place underground, without physically mining or extracting the resource, drawing on A&A's own hands-on Underground Coal Gasification (UCG) pilot-test experience.
5. Blue Ammonia Consulting
CO₂ storage, CO₂-EOR, and 45Q tax-credit qualification support for blue ammonia projects — the CO₂ storage side of the blue hydrogen feedstock that ammonia synthesis depends on, for one of the world's highest-volume industrial chemicals.
6. Natural Hydrogen Consulting
Exploration, resource assessment, drilling, and development support for naturally occurring (geologic, white, or gold) hydrogen accumulations — an emerging, zero-production-emissions resource now drawing substantial exploration capital worldwide.
Critical Minerals & Geothermal Brine Resources
7. Lithium (DLE) Consulting
Brine resource assessment, characterization, and well-engineering services for Direct Lithium Extraction (DLE) from oilfield and geothermal brines — applying A&A's subsurface fluids expertise to one of the energy transition's most consequential critical-minerals supply chains.
8. Geothermal Energy Resources Assessment & Development Consulting
Resource assessment, reservoir simulation, and well engineering for conventional hydrothermal, Enhanced Geothermal Systems (EGS), superhot-rock, and closed-loop geothermal projects — increasingly central to power-grid reliability and hyperscale data-center energy strategy.
Industrial Decarbonization
9. Industrial CO₂ Storage and 45Q Tax Credit Consulting
CO₂ storage, CO₂-EOR, and federal 45Q tax-credit qualification support for CO₂ originating from industrial and power-generation sources — cement, iron & steel, power generation, ethanol, bioenergy (BECCS), and direct air capture (DAC) — extending A&A's storage expertise beyond the oil & gas sector's own emissions.
Related A&A Service: For A&A's full CCS/CCUS consulting practice — CO₂-EOR and dedicated geologic storage, well-integrity and regulatory support (Class II vs. Class VI wells), and monitoring, reporting, and verification (MRV) for oil & gas-sector CO₂ projects — please see A&A's CCS/CCUS Consulting page.
Related A&A Service: For A&A's produced water beneficial-reuse and orphan/legacy well methane-reduction services — where an operator's own upstream assets create both emissions liability and decarbonization opportunity — please see A&A's Upstream Oil & Gas Consulting page.
Greenhouse Gas Emissions Reduction Advisory
Alongside the nine dedicated services above, A&A's consultants advise clients on field-level emissions assessment and reduction planning for upstream operations — methane management, flaring and venting reduction screening, and electrification opportunity screening — as part of a broader decarbonization strategy engagement, drawing on the same reservoir and well-engineering disciplines A&A applies throughout its energy transition practice.
How A&A's Energy Transition Services Fit Together
The four categories above address the distinct technical questions a decarbonization strategy raises, though A&A clients engage A&A at whichever point their project actually needs support:
• Long-duration energy storage: thermal (GeoTES/UTES/ATES/BTES/MTES) and mechanical/chemical (natural gas, hydrogen, CAES) storage technologies that make intermittent renewable power and seasonal energy demand reconcilable
• Hydrogen and ammonia value chain: blue and natural hydrogen production and storage, underground gasification, and blue ammonia — the CO₂ storage and subsurface engineering that lower-carbon hydrogen and ammonia depend on
• Critical minerals and geothermal brine resources: lithium and geothermal projects that monetize the same brine-hosted subsurface resources oil & gas operators already have wells and data for
• Industrial decarbonization: extends A&A's CO₂ storage expertise to industrial and power-generation emitters outside the oil & gas sector itself
A&A's Energy Transition Track Record
A&A's energy transition consultants bring more than 36 years of combined reservoir engineering and geoscience project experience to bear on subsurface energy storage, geothermal, brine lithium, hydrogen, ammonia, and industrial CO₂ storage projects, worldwide. That experience is grounded in the same well-engineering, reservoir-characterization, and injection-design disciplines A&A has applied to conventional oil & gas, CO₂-EOR, and CCS/CCUS projects for decades — which is why A&A's energy transition recommendations are sized to what a client's assets, capital, and organization can actually execute, not to a technology vendor's roadmap.
Why Oil & Gas Companies Choose A&A for the Energy Transition
• Subsurface-first: carbon storage, geothermal, brine lithium, and underground hydrogen/gas/CAES storage are all subsurface businesses, and A&A brings decades of reservoir engineering and geoscience project experience to them
• Independent: no technology, equipment, or project equity to promote — A&A's advice is unconflicted
• Practical: decarbonization strategies sized to what a client's assets, capital, and organization can actually execute
What A&A Delivers
An Energy Transition & Decarbonization engagement with the A&A Consulting Team is built around the practical decisions your company needs to make, including, but not limited to:
• A cost-per-tonne-of-CO₂ ranking of emissions-reduction and carbon-management measures across your portfolio
• A technical and commercial evaluation of which lower-carbon energy projects genuinely fit your subsurface positions and infrastructure
• Site characterization, engineering design, and well-integrity due diligence for a storage, geothermal, or lithium-brine project of any kind
• Independent, vendor-neutral technical due diligence for investors and lenders considering an energy transition investment
• Portfolio-level transition road-mapping, and executive and technical training that builds in-house capability
Frequently Asked Questions
Which A&A energy transition service is the right starting point for our project?
It depends on what your company already has. An operator with depleted reservoirs, saline aquifers, or salt caverns often starts with Underground (Subsurface) Gas Storage or Energy Storage Assessment; a company with oilfield or geothermal brine typically starts with Lithium (DLE) Consulting or Geothermal Energy Resources Assessment; and a company evaluating a low-carbon hydrogen or ammonia project typically starts with Blue Hydrogen, Natural Hydrogen, or Blue Ammonia Consulting, depending on the production pathway. A&A's consultants can help identify the right entry point for your specific project.
How does this practice relate to A&A's CCS/CCUS Consulting practice?
A&A organizes CCS/CCUS — CO₂-EOR, dedicated geologic storage, and Class II/Class VI well design and regulatory support for the oil & gas sector's own CO₂ — as its own dedicated consulting hub. This Energy Transition & Decarbonization practice covers the adjacent lower-carbon energy projects (storage, hydrogen, ammonia, lithium, geothermal) that build on the same subsurface skills, plus Industrial CO₂ Storage for CO₂ originating outside the oil & gas sector, and cross-links to the CCS/CCUS hub wherever a project needs that dedicated depth.
Does A&A provide greenhouse gas emissions reduction, flaring, or methane-management support?
Yes, as part of a broader decarbonization strategy engagement — A&A advises on field-level emissions assessment, methane management, flaring and venting reduction screening, and electrification opportunity screening. A&A's dedicated Orphan & Legacy Well Plugging and Abandonment Consulting and Produced Water Management Consulting services, under A&A's Upstream Oil & Gas Consulting practice, address two of the most consequential upstream methane sources in depth.
Why does A&A group lithium, geothermal, and hydrogen storage into an "energy transition" practice rather than treating them as unrelated businesses?
Because they draw on the same underlying subsurface disciplines — reservoir characterization, well engineering, injection and withdrawal design, and long-term monitoring — that A&A has applied to conventional oil & gas for more than five decades. A&A's clients are frequently oil & gas companies evaluating exactly these projects as extensions of assets, data, and capabilities they already have, which is the organizing logic behind grouping them together here.
Does A&A sell any energy transition technology, or hold equity in any project?
No. A&A is an independent petroleum engineering and geoscience consulting firm. A&A does not sell energy-storage, electrolyzer, drilling, or process equipment, and holds no equity in any technology or project, so A&A's energy transition recommendations are never influenced by a stake in any particular vendor, technology, or project.
Whether you are evaluating your first CO₂ storage site, screening your portfolio for emissions reductions, or weighing a geothermal, lithium, hydrogen, ammonia, or underground storage opportunity, the A&A Consulting Team can help you move from ambition to an engineered, bankable plan.
Please contact us for a tailored commercial and technical proposal for your project.
