Japanese Industry Technical Brief
Firm renewable power, carbon-atom recycling and industrial integration
| CRT converts intermittent renewable electricity into firm, dispatchable power by using renewable hydrogen as the recurring energy-bearing input and maintaining carbon atoms as a circulating elemental inventory. |
Executive proposition
CEWT’s Carbon Recycling Technology (CRT) is a process architecture intended to decouple the timing of renewable-energy production from the timing of industrial power demand. Renewable electricity produces hydrogen; captured carbon is recycled into Recycled Synthetic Natural Gas (RSNG); RSNG provides a storable fuel for firm generation; and the resulting CO2 is captured and returned to the cycle.
The central concept is not continuous fossil-fuel consumption. In steady-state CRT, the carbon atoms are treated as a circulating process inventory. Renewable electricity is the recurring external energy source, introduced through hydrogen.
Why this may be relevant to Japanese industry
• Japan’s GX policy combines decarbonisation, stable energy supply and industrial competitiveness.
• Japan’s energy policy explicitly supports low-carbon hydrogen and derivatives including e-methane, together with CCUS.
• Existing gas, thermal and industrial infrastructure can potentially be retained while the source of recurring energy progressively shifts toward renewable electricity.
• CRT is intended for applications where firm power, thermal integration and long-duration molecular storage have value beyond direct electrification alone.
CEWT development applications
| 100 MW CRT Baseload | 20 MW CRT Trigeneration | 0.2 MTPA Green Iron |
| Firm renewable power | Power + useful thermal services | Integrated power + reducing-gas platform |
Status note: This brief presents the governing process concept and engineering framework. Final performance claims require closure of vendor data, detailed heat integration, auxiliary loads, carbon losses/makeup and project-specific operating cases.
1. Governing Definition of CRT
Carbon Recycling Technology (CRT) is a process technology designed to convert intermittent renewable energy into firm, dispatchable power through a closed carbon-recycling fuel cycle.
A hydrocarbon fuel may be used initially to establish the circulating carbon inventory. During operation, CO2 from power generation is captured rather than routinely discharged. Renewable electricity is used to produce hydrogen, which is then combined with captured carbon – directly or through an integrated synthesis route – to regenerate RSNG for reuse in the power cycle.
| INTERMITTENT RENEWABLE ELECTRICITY |
| ↓ Electrolysis |
| RENEWABLE H2 + CAPTURED CARBON |
| ↓ Fuel regeneration / RSNG synthesis |
| RSNG → FIRM POWER → CO2 CAPTURE → CARBON RETURN |
Steady-state objectives
• Convert variable renewable electricity into a storable chemical-energy form and recover it when firm power is required.
• Avoid continuous fresh fossil-carbon consumption by retaining and recycling the carbon-atom inventory, subject to measurable losses and makeup.
• Prevent routine process CO2 discharge by capturing carbon after power generation and returning it to the fuel-production cycle.
• Recover useful heat and integrate oxygen, steam, water, compression and separation duties at the total-system level.
What CRT is – and is not
CRT is best described as a renewable-energy firming and carbon-recycling architecture. It is not simply conventional fossil generation with downstream CO2 capture, and it is not equivalent to geological CCS. Captured carbon is intended to remain useful process inventory.
Technical wording: Until a complete lifecycle boundary is demonstrated, CEWT should use the claims ‘no continuous fresh fossil-carbon requirement at steady state’ and ‘no routine process CO2 emissions’, rather than an unqualified zero-emissions claim.
2. The C/H Two-Ledger Concept
CRT can be understood most clearly by tracking two atomic ledgers. The molecules change, but the carbon and hydrogen atoms remain accountable throughout the process.
| Ledger | Simplified atomic path | Engineering interpretation |
| Carbon (C) | CH4 → CO2 → CH4 → … | Circulating elemental inventory. Fresh carbon is required only to replace losses or purge. |
| Hydrogen (H) | H2O → H2 → fuel → H2O | Renewable electricity re-energises the hydrogen cycle through electrolysis. |
Representative reactions
Electrolysis: 2 H2O + renewable electricity → 2 H2 + O2
Methanation: CO2 + 4 H2 → CH4 + 2 H2O + recoverable heat
Combustion: CH4 + 2 O2 → CO2 + 2 H2O + heat
Energy-equivalent material accounting
The two atomic ledgers provide material accountability. Energy accountability is added by assigning an engineering energy equivalent to each energy-bearing stream. For example:
H2 energy rate = H2 mass flow × H2 LHV
RSNG energy rate = RSNG mass flow × mixture LHV
Electrical input/output = MW_e
Recovered process heat = MW_th
This is conventional chemical-engineering thermodynamics, not relativistic mass-energy conversion. The purpose is to show simultaneously where the atoms go and where the useful chemical, thermal and electrical energy goes.
| Core CRT insight: carbon atoms circulate; renewable electricity repeatedly raises the chemical energy of the hydrogen cycle; regenerated fuel then provides storage and dispatchability. |
3. Simplified Process Flow Diagram (PFD)
The diagram below is deliberately simplified. Detailed project PFDs will add compressors, heat exchangers, water treatment, ASU/oxygen integration, CO2 purification, recycle controls, storage and project-specific equipment.
| INTERMITTENT RENEWABLE POWER | ||
| ↓ | ||
| WATER → | ELECTROLYSER | → O2 / process integration |
| ↓ Renewable H2 | ||
| Captured CO2 → | FUEL REGENERATION / METHANATION | → Recoverable heat |
| ↓ RSNG | ||
| RSNG STORAGE / BUFFER | ||
| ↓ Dispatch on demand | ||
| O2 / oxidant → | POWER / TRIGEN / INDUSTRIAL USE | → Firm electricity + useful heat |
| ↓ CO2-containing exhaust / process gas | ||
| CO2 CAPTURE & CONDITIONING ↺ RETURN TO FUEL REGENERATION |
PFD interpretation
• Renewable electricity is the recurring external energy input.
• Electrolysis converts part of that electrical input into the chemical energy of hydrogen.
• Captured carbon atoms are returned to fuel regeneration instead of being treated as a routine waste stream.
• RSNG acts as the dispatchable chemical-energy storage medium between renewable production and firm power demand.
• Methanation heat, oxygen and other co-streams must be integrated rather than ignored; their value depends on the specific project.
• Carbon losses, purge requirements and startup fuel must be explicitly measured in the final carbon ledger.
4. CEWT Integrated Application Architecture
CEWT is developing the CRT principle across three applications that should ultimately be evaluated as one integrated energy-and-material architecture rather than as isolated equipment blocks.
| Application | Primary product | CRT role | Key balance to close |
| 100 MW Baseload | Firm electricity | Renewable-energy firming through recycled fuel cycle | Net output after ASU/CPU/compression and other auxiliaries |
| 20 MW Trigen | Electricity + useful thermal services | Distributed firm energy and heat/cooling integration | Net electrical output plus separately valued thermal services |
| 0.2 MTPA Green Iron | DRI / Green Iron | H2/CO reducing-gas integration, recycle and heat recovery | H2 demand, top-gas composition, recycle compression, CO2 removal and heating duty |
Current integrated screening basis
234 MW renewable import → 100 MW baseload + 20 MW Trigen + 0.2 MTPA Green Iron
On the current portfolio arithmetic, subtracting 100 MW and 20 MW of net electrical products from 234 MW leaves 114 MW associated with the Green Iron production at the overall system level. At 200,000 t/y and 8,760 h/y, 114 MW corresponds to approximately 5.0 MWh/t.
Important boundary condition: The 114 MW figure is an integrated allocation, not yet a verified standalone DRI electricity consumption. The master balance must prove that the 100 MW and 20 MW are net outputs and must include electrolysis, ASU/oxygen, CO2 conditioning, compression, pumps, recycle gas, heating, water systems and other auxiliaries.
Proposed master-model structure
• Ledger A – Carbon atoms: inventory, species distribution, capture, recycle, purge, losses and makeup.
• Ledger B – Hydrogen atoms: water feed, H2 generation, fuel/reducing-gas incorporation, water formation and recycle.
• Energy equivalent – MW_e, MW_chemical and MW_th attached to all significant energy-bearing states.
• Products – firm electricity, useful thermal energy and tonnes of Green Iron on a common operating basis.
5. Japanese Industry Evaluation Framework
For Japanese industrial evaluation, CRT should be tested against incumbent and alternative routes on an equivalent system boundary. The first technical meeting should therefore focus on measurable integration questions rather than broad decarbonisation claims.
| Evaluation question | CRT data required |
| What is the carbon closure? | CO2 capture %, carbon inventory, purge/losses, fresh-carbon makeup. |
| What renewable power is required? | Electrolyser MW, auxiliaries, capacity factor, storage strategy. |
| What is the firm-power performance? | Net MW, availability, startup/ramp profile, storage duration. |
| What is the heat-integration value? | Methanation heat, steam levels, useful heat/cooling recovery. |
| Can existing infrastructure be retained? | Fuel specifications, pressure/temperature interfaces, materials compatibility. |
| How does CRT compare with alternatives? | Equivalent-boundary comparison with direct electrification, BESS, H2 and conventional e-methane routes. |
| What is required for deployment? | Safety case, codes/standards, certification, emissions monitoring and demonstration plan. |
Relevance to Japan’s GX direction
Japan’s GX2040 direction seeks the simultaneous achievement of decarbonisation, stable energy supply and economic growth. METI also identifies hydrogen and derivatives including e-methane, together with CCUS, among technologies for social implementation. Japan’s strategic-area policy includes industrial complexes, data-centre clusters and locations using decarbonised power – all potentially relevant contexts for evaluating firm-energy integration.
Recommended next technical package
Before a formal Japanese industry approach, CEWT should complete a project-specific master mass/energy model and issue a controlled technical data pack containing: design basis; C/H ledgers; detailed PFD; heat and utility balance; net-power reconciliation; carbon closure; storage assumptions; safety basis; and an apples-to-apples comparison with the incumbent route.
Selected public policy references
• METI, GX / GX2040 Vision and growth-oriented carbon pricing framework (2025-2026).
• METI, Emissions Trading System: full-scale operation from FY2026 for covered direct emitters.
• Agency for Natural Resources and Energy, synthetic methane / e-methane policy and procurement framework.
• METI, GX Strategic Area framework, including industrial-complex, data-centre and decarbonised-power categories.
CEWT working principle: Track the carbon atom. Track the hydrogen atom. Attach an energy equivalent to each relevant chemical state. The resulting balance should show, quantitatively, how intermittent renewable energy is transformed into firm power and industrial products.
