NMX‑GHG‑1000 / Rev 00 / MW-scale · 99.999% / ISO 22734 · solar / wind 2026 · Product Page

NMX-GHG-1000 · ENGINEERED TO ORDER — GREEN HYDROGEN GENERATION PLANTS

The stack makes the gas. The plant makes it hydrogen.

Name: Green Hydrogen Generation Plant
Brand: Neometrix

A turnkey green hydrogen generation plant — a MW-scale electrolyser and the full balance of plant that turns raw electrolyser gas into pure, dry, compressed hydrogen: rectifier and load-following, water treatment, purification and drying to 99.999%, compression, storage and H₂ safety, to ISO 22734. Solar/wind-coupled. Engineered to order — the electrolyser stack is bought in, Neometrix engineers the plant; no specific delivered plant is claimed on this page.

Enquire — green hydrogen plants Capability sheet (PDF)

Illustrative image, not a delivered installation — a green hydrogen generation plant on a clean industrial site: rows of grey containerised electrolyser and balance-of-plant units with pipework, a bank of tall hydrogen storage tubes to one side, and a large field of solar photovoltaic panels stretching behind under a clear sky

Fig · 01 Renewable power in, pure hydrogen out — electrolyser plus balance of plant — illustrative, not a delivered installation

Electrolyser

MWPEM / alkaline

Purity

99.999% (5N)

Delivery

30bar

Coupled

solar/ wind

Built to

ISO22734

ISO 9001 / 14001 Engineered to order Turnkey EPC + balance of plant ISO 22734 · ATEX safety Noida · India

Overview

The gas is the easy part. Hydrogen is the plant.

Buy an electrolyser and you have a stack that makes wet, low-pressure, impure gas. Turning that into hydrogen a refinery or a fuel cell will accept — 99.999% pure, dry, compressed, safely stored, made from a supply that comes and goes with the sun — is the balance of plant. That is roughly eighty per cent of the works, and it is exactly what Neometrix builds.

Illustrative image, not a delivered installation — the balance of plant of a green hydrogen plant: grey electrical rectifier and control cabinets on the left, a water-treatment skid with vessels and pumps in the centre, two tall stainless gas purification and drying columns, and a compressor package, joined by stainless pipework on a concrete plinth

Fig · 02 Rectifier, water treatment, purification/drying and compression — the balance of plant — illustrative, not a delivered installation

Green power is intermittent — the plant must follow it. A solar or wind-coupled electrolyser sees a ramping, variable input, so the rectifier, controls and buffering must load-follow without harming the stack or losing purity. That is the difference between a green plant and a grid-fed grey one.

Purity starts with water and ends with drying. Feed water is deionised because impurities poison the stack; the output is de-oxygenated and dried to a low dew point for five-nines purity. Water treatment and drying bracket the stack.

Hydrogen is the hardest gas to contain. Smallest molecule, widest flammability, near-invisible flame — so leak detection, ATEX hazardous-area design, purging and the safety case are foundational.

Anyone can buy a stack. The plant — the power, the water, the purity, the pressure and the safety around it — is where a green hydrogen project is won or lost.

What We Do

The plant, not the stack

Neometrix delivers the balance of plant and the EPC — rectifier and load-following, water treatment, gas purification and drying, compression, storage, H₂ safety and controls — and integrates a bought-in electrolyser. We engineer plants; we do not make electrolyser stacks, and we say so.

A Gas Plant, Marinised for H₂

Our franchise, pointed at hydrogen

Compression, storage, purification, HP-gas handling, hazardous-area safety and controls are Neometrix product lines in their own right. A green hydrogen plant is those competences assembled around the electrolyser — which is why the plant is the part we own.

Honest on the Model

EPC — and BOO with a partner

Where a tender is build-own-operate, ownership and long-term operation are handled with a developer or O&M partner; Neometrix’s role is the engineering, supply and commissioning. We are an EPC and equipment company, not a hydrogen IPP, and we scope accordingly.

Architecture

Power to gas, gas to hydrogen.

The schematic follows renewable power through the rectifier and stack to raw gas, then through the balance of plant that makes it usable hydrogen — and the detail panel marks the part that is Neometrix’s scope.

FIG · 03PLANT ARCHITECTURE · RECTIFIER · ELECTROLYSER · PURIFY / DRY · COMPRESS · STORE · SAFETY

Fig · 03 The stack is bought in; the balance of plant — power, water, purity, pressure, safety — is engineered and delivered by Neometrix

Arc · 01

Power & the Stack

A transformer-rectifier converts renewable AC to the DC the stack needs, engineered to load-follow a variable solar/wind input. The electrolyser — PEM or alkaline, bought in — splits deionised water into raw wet hydrogen.

Arc · 02

Water In, Purity Out

Deionised water treatment feeds the stack (impure water poisons it, ~9 L/kg H₂); on the outlet, gas separation, de-oxygenation and drying take the hydrogen to 99.999% at a low dew point. Water and drying bracket the stack.

Arc · 03

Compression & Storage

Hydrogen is compressed to a delivery pressure of about 30 bar, and up to 200–350 bar for storage and distribution, then buffered — the HP-gas compression and storage that is Neometrix’s core competence.

Arc · 04

Safety & Control

Nitrogen purging, venting, leak detection and ATEX hazardous-area design throughout, with a PLC/SCADA that load-follows the renewable input — all to ISO 22734 with a full safety case, because hydrogen forgives nothing.

Have a green hydrogen, electrolyser-integration or hydrogen balance-of-plant requirement? Send the H₂ output, purity and power profile — a clause-by-clause compliance matrix within two working days · [email protected]

Send tender spec

Specifications

Reference plant, sized to your output.

The parameters below describe a reference green hydrogen plant. Electrolyser type and size, output, purity, delivery pressure, water and power follow from the hydrogen demand, the offtake and the renewable supply.

Illustrative image, not a delivered installation — hydrogen storage and control: a fenced bank of long horizontal high-pressure hydrogen storage tubes on steel saddles outdoors, and inset, a clean control room with a grey panel carrying a blank operator screen and status indicators

Fig · 04 High-pressure storage and the control room — where the plant is buffered and load-followed — illustrative, not a delivered installation

Where green hydrogen plants actually fail

Not at the stack — around it. A plant designed for steady grid power chokes when the solar ramps and the rectifier cannot follow; a drying train sized for a datasheet lets the dew point creep and the purity fails a customer’s spec; water treatment skimped on lets impurities shorten the stack’s life; a safety case treated as paperwork meets the one gas that punishes it.

That is why the rectifier is engineered for a variable input, the drying to a proven dew point, the water to stack-grade purity, and the whole plant to a real ISO 22734 safety case. A green hydrogen plant is a promise about the balance of plant — everything here is arranged to keep it.

Full specification — expand

Scope	Green hydrogen generation plant — turnkey EPC: plant design, balance-of-plant engineering & fabrication, electrolyser integration, installation, commissioning, safety case, documentation and training · BOO ownership/O&M via developer partner where required
What Neometrix Delivers	The balance of plant (~80% of the works) — rectifier & load-following, water treatment, gas purification & drying, compression, storage, H₂ safety and controls — plus integration of a bought-in electrolyser. Neometrix does not manufacture electrolyser stacks
Electrolyser	PEM or alkaline stack(s), MW-scale, from established makers · integrated, powered, watered, purified, compressed and protected by the Neometrix plant
Purity	99.999% (5N) · gas-liquid separation, de-oxygenation and drying to a low dew point · feed water deionised (~9 L DI water per kg H₂)
Delivery & Storage	Compressed to ~30 bar delivery, up to 200–350 bar for storage/distribution · buffer storage sized to the offtake profile
Power	Transformer-rectifier (AC → DC) sized for the stack, engineered for a ramping renewable supply · solar / wind or RE-grid coupled
Safety	Nitrogen purging, vent/flare, H₂ leak detection, hazardous-area (ATEX/IEC) design and a full safety case · ISO 22734, NFPA 2, PESO/IS practice
Controls	PLC / SCADA load-following the renewable input · remote monitoring · production, purity and safety logging
Applications	Refinery & ammonia/fertilizer green H₂, green-mobility fuel supply, steel & industrial decarbonisation, power-sector H₂, port & export hydrogen, captive industrial hydrogen
Sourcing	Electrolyser stack, transformer-rectifier, compressors and instrumentation are proprietary items from established makers; Neometrix engineers and integrates the plant around them
Status	Engineered to order; turnkey EPC / engineered package · electrolyser bought in · BOO via partner where required · no specific delivered plant is claimed on this page

PDF · 1 page

Green Hydrogen Generation Plant — Capability Sheet

Tender Response

Send your H₂ output & power profile — compliance matrix in two working days

Variants

One discipline, four ways in.

Tenders call it a green hydrogen generation unit, an electrolyser plant, a hydrogen EPC or a balance-of-plant package. The discipline — renewable power to pure, safe, compressed hydrogen — is common to all.

Var · 01

Green Hydrogen Generation Plant

The turnkey plant — MW-scale PEM or alkaline electrolyser integrated with the full balance of plant, solar/wind-coupled, delivered as an EPC to ISO 22734.

Var · 02

Balance of Plant & Integration

For electrolyser OEMs and developers — the rectifier, water, purification, drying, compression, storage, safety and controls engineered around their stack, as a package or an EPC.

Var · 03

Purification, Drying & Compression Trains

The gas-processing back end on its own — de-oxygenation, drying to five-nines and HP compression/storage — to lift an existing electrolyser’s output to a usable, deliverable spec.

Var · 04

Renewable-Coupled / Off-Grid H₂

Plants engineered for a variable or islanded supply — load-following rectifiers, buffering and controls for solar/wind-only or weak-grid sites where steady power cannot be assumed.

Applications

Where it applies.

Wherever industry needs green hydrogen made on site, pure and safe, from renewable power.

A · 01Refineries & ammonia / fertilizer — green H₂ feedstock

A · 02Green-mobility fuel supply — hydrogen for refuelling networks

A · 03Steel & industrial decarbonisation — process hydrogen

A · 04Power sector — hydrogen blending & firming

A · 05Ports & export — hydrogen and derivative production hubs

A · 06Captive industrial hydrogen — on-site generation vs merchant supply

FAQ

Common questions.

Plain-language answers from the engineering team.

Q · 01 Do you make the electrolyser, or the plant around it?

The plant — and we are deliberately clear about that. The electrolyser stack, PEM or alkaline, is a specialist item bought from an established maker, and choosing and integrating the right one for the duty is part of the engineering. What Neometrix designs, supplies and commissions is everything else, which is roughly eighty per cent of the works: the transformer-rectifier and load-following controls, the deionised water treatment, the gas separation, purification and drying that reach five-nines purity, the compression and storage, the hydrogen safety and hazardous-area design, and the PLC/SCADA. That balance of plant is where a green hydrogen project actually succeeds or fails, and it is squarely our competence — the same compression, purification, HP-gas and safety engineering behind our other gas systems. We would rather tell you plainly that we integrate a bought-in stack than imply we manufacture one.

Q · 02 What makes green hydrogen harder to produce than grey?

The power. Grey hydrogen from a steam methane reformer, and even a grid-fed electrolyser, runs on a steady, controllable energy supply. A green plant is coupled to solar or wind, which is variable and ramping by nature — the sun goes behind a cloud, the wind drops, and the available power swings. The plant has to load-follow that: the rectifier must deliver clean DC across a wide range without harming the stack, the controls must ramp production up and down safely, and buffering must smooth the output so downstream users see steady hydrogen. Do it badly and you either damage the stack, lose purity during transients, or waste renewable energy. This is why the rectifier, the controls and the buffering — not the stack — are where the green-specific engineering lives, and why a plant designed for steady grid power will struggle on a real renewable site.

Q · 03 How is this different from your hydrogen refuelling station and P2P system?

Different jobs entirely. A hydrogen refuelling station dispenses hydrogen into vehicles — its work is high-pressure storage, pre-cooling and the nozzle, to standards like ISO 19880 and SAE J2601; it is a fuelling forecourt. The power-to-power (P2P) system is a small, round-trip energy-storage unit — a modest electrolyser, a little hydride storage and a fuel cell that turns the hydrogen back into electricity for backup power. A green hydrogen generation plant is neither: it is an industrial-scale production plant whose product is the hydrogen itself — tonnes of it, pure and compressed, for a refinery, an ammonia unit or a fuel-supply network. No dispensing nozzle, no fuel cell, no round trip — just renewable power in and pure hydrogen out, at scale. They are complementary lines, and a project may use more than one, but this page is the production plant.

Q · 04 Why does purity depend on the water and the drying?

Because impurities enter at both ends. At the inlet, the stack is fed water, and if that water carries dissolved salts or ions it fouls the membrane or electrolyte and shortens the stack’s life — so the feed is deionised or demineralised to a tight conductivity, at roughly nine litres per kilogram of hydrogen produced. At the outlet, the raw gas leaves saturated with water vapour and carrying a little oxygen crossover, so it is passed through gas-liquid separation, a de-oxygenation (deoxo) stage and a drier that pulls the dew point right down — that is what takes it from wet, roughly-pure gas to 99.999% (five-nines) dry hydrogen a customer will accept. Neither the water treatment nor the drying is glamorous, and both are essential: they bracket the stack, and the purity on the certificate is really a statement about how well they were engineered.

Q · 05 Hydrogen is dangerous — how is the plant made safe?

By designing for hydrogen’s specific hazards from the outset, not bolting on safety at the end. Hydrogen is the smallest molecule (it leaks through the tiniest paths), has the widest flammability range of common fuels, and burns with a near-invisible flame. So the plant is built as a hazardous-area (ATEX/IEC) installation: equipment rated for the zones it sits in, comprehensive hydrogen leak detection, forced ventilation, nitrogen purging of systems before and after work, and controlled venting or flaring of relief and blow-down. Over-pressure protection, emergency shutdown and a documented safety case to ISO 22734 and codes such as NFPA 2 and PESO/IS requirements run through the whole design. It is the same HP-gas safety discipline behind our other hydrogen and high-pressure systems, applied to a bigger inventory.

Q · 06 These tenders are often build-own-operate — can you do that?

We do the engineering and the plant; the ownership and operation we do with a partner. Many green hydrogen tenders are structured as build-own-operate (BOO), where the successful bidder finances, owns and runs the plant for years and sells the hydrogen — that is a developer or independent-producer role, and Neometrix is an EPC and equipment company, not a hydrogen IPP. So on a BOO project we team with a developer or O&M operator who takes the ownership and offtake, while we deliver what we are good at: the plant design, the balance of plant, the electrolyser integration, installation and commissioning. On a straight EPC or supply tender — design, engineer, supply, install, commission — we are the direct provider. Telling you which role we are playing, up front, is part of how we scope a green hydrogen enquiry honestly; no delivered plant is claimed on this page.

↗

The hydrogen line from Neometrix.

The rest of the hydrogen chain — dispensing, boosting and round-trip power — engineered at our Noida facility.

↗ Dispensing

Hydrogen Refuelling Station

Dispenses green hydrogen to vehicles — the forecourt, not the plant.

↗ Compression

Hydrogen Gas Boosting Station

High-pressure boosting — the compression competence behind the plant.

↗ Round-Trip

Hydrogen Power-to-Power (P2P) System

Electrolyser + fuel cell for backup power — the round-trip sibling.

Browse all Neometrix product lines.

Get a quotation

Send your hydrogen output
and power profile.

The Projects desk replies within two working days with a clause-by-clause compliance matrix and a budgetary quotation. Write to [email protected] or use the form.

Enquire — green hydrogen plants Capability sheet (PDF) +91 7777 876 876

ISO 9001 / 14001 ENGINEERED TO ORDER — GREEN HYDROGEN GENERATION PLANTS MW-SCALE · 99.999% · ISO 22734 · EPC + BALANCE OF PLANT ENGINEERED IN NOIDA · INDIA

The stack makes the gas. The plant makes it hydrogen.

The gas is the easy part. Hydrogen is the plant.

The plant, not the stack

Our franchise, pointed at hydrogen

EPC — and BOO with a partner

Power to gas, gas to hydrogen.

Power & the Stack

Water In, Purity Out

Compression & Storage

Safety & Control

Reference plant, sized to your output.

Where green hydrogen plants actually fail

One discipline, four ways in.

Green Hydrogen Generation Plant

Balance of Plant & Integration

Purification, Drying & Compression Trains

Renewable-Coupled / Off-Grid H₂

Where it applies.

Common questions.

The hydrogen line from Neometrix.

Hydrogen Refuelling Station

Hydrogen Gas Boosting Station

Hydrogen Power-to-Power (P2P) System

Send your hydrogen output
and power profile.

Similar Products

Share This Page

The stack makes the gas. The plant makes it hydrogen.

The gas is the easy part. Hydrogen is the plant.

The plant, not the stack

Our franchise, pointed at hydrogen

EPC — and BOO with a partner

Power to gas, gas to hydrogen.

Power & the Stack

Water In, Purity Out

Compression & Storage

Safety & Control

Reference plant, sized to your output.

Where green hydrogen plants actually fail

One discipline, four ways in.

Green Hydrogen Generation Plant

Balance of Plant & Integration

Purification, Drying & Compression Trains

Renewable-Coupled / Off-Grid H₂

Where it applies.

Common questions.

The hydrogen line from Neometrix.

Hydrogen Refuelling Station

Hydrogen Gas Boosting Station

Hydrogen Power-to-Power (P2P) System

Send your hydrogen outputand power profile.

Similar Products

Share This Page

Send your hydrogen output
and power profile.