50% H₂ blend proven at scale

Hydrogen-Ready Combined Cycle Gas Turbines

Hydrogen-ready gas turbines — combined-cycle (CCGT) machines built to burn natural gas today and transition to 100% hydrogen — are already proven at scale. GE Vernova, Siemens Energy and Mitsubishi Power run 30–50% hydrogen blends now and pure-hydrogen units capable of 600 MW+ by 2026–2030, enabling zero-carbon dispatchable power. GRECO designs this capability into its AI campus power from day one.

600+ MW
Per Turbine Capacity
100%
Hydrogen Capable
>64%
Thermal Efficiency
2026
Commercial Deployment

How Hydrogen CCGT Works

Combined Cycle Gas Turbines (CCGT) are the most efficient form of thermal power generation, achieving over 64% efficiency by combining a gas turbine with a steam turbine in a two-stage process. The exhaust heat from the gas turbine drives the steam cycle, extracting maximum energy from the fuel.

Hydrogen-ready CCGT turbines are engineered to operate on variable blends of natural gas and hydrogen, with a clear pathway to 100% hydrogen combustion. This requires advanced dry low-emissions (DLE) combustion systems that manage hydrogen's unique flame characteristics—faster flame speeds, higher temperatures, and different stoichiometry than natural gas.

Major manufacturers have made significant progress: In October 2023, the EU-funded HYFLEXPOWER project successfully operated a Siemens Energy SGT-400 on 100% renewable hydrogen—a world first for an industrial gas turbine at this scale. In November 2024, GE Vernova announced its LM6000VELOX package will power South Australia's Whyalla hydrogen plant with 100% hydrogen capability by 2026.

HRSG Heat Recovery: Achieving 90% Efficiency

Heat Recovery Steam Generators (HRSG) capture waste heat from gas turbine exhaust to produce steam for additional power generation and industrial applications. When combined with Combined Heat and Power (CHP) systems, total facility efficiency reaches 90%—nearly double that of simple-cycle gas turbines.

How CHP Creates Value: Instead of releasing exhaust heat to the atmosphere, HRSG systems extract thermal energy for district heating networks, industrial process heat, or additional electricity generation. This creates a second revenue stream from the same fuel input while dramatically reducing emissions per unit of useful energy delivered.

The Greco Energy Advantage: Our integrated CHP design captures waste heat through advanced HRSG systems for district heating and industrial applications. This approach achieves industry-leading 90% total efficiency—transforming a power plant into a multi-purpose energy hub with diversified revenue streams.

90%
Total Efficiency
2x
Revenue Streams
50%
Less Fuel Waste

Industry Milestones

2023

HYFLEXPOWER Achieves 100% Hydrogen

Siemens Energy SGT-400 industrial gas turbine successfully operates on 100% renewable hydrogen in the EU-funded HYFLEXPOWER project.

2024

GE Vernova Whyalla Contract

GE Vernova secures order for four LM6000VELOX units capable of 100% hydrogen operation for South Australia's Hydrogen Jobs Plan.

2024

Mission H2 Power Launch

Siemens Energy and SSE launch project to develop 100% hydrogen combustion for the SGT5-9000HL gas turbine at Keadby 2 Power Station.

2026

Commercial 100% H₂ Operations

Whyalla hydrogen power plant expected to commission with 200MW capacity running on renewable hydrogen.

Leading Technology Providers

GE Vernova

LM6000VELOX aeroderivative package—first to operate on 100% hydrogen at commercial scale. 7HA.03 heavy-duty turbine capable of 50%+ hydrogen blends today.

Whyalla Project: 200MW, 2026

Siemens Energy

SGT-400 achieved 100% H₂ operation in HYFLEXPOWER project. Mission H2 Power developing 100% capability for flagship SGT5-9000HL turbine.

Keadby 2: 850MW, UK

Mitsubishi Power

M501JAC turbine achieving 30% hydrogen co-firing. Targeting 100% hydrogen capability by 2030 through advanced combustion development.

Takasago Works: Testing Facility

Greco Energy's Approach

Led by Leo Paskalidis, our flagship facility will deploy hydrogen-ready CCGT technology from day one. By designing for hydrogen compatibility from the start, we ensure a clear pathway to zero-carbon power generation as green hydrogen production scales and costs decline.

North American FacilityH₂-Ready from Day 1Phased Transition

Sources & Further Reading

GE Vernova• November 2024

GE Vernova LM6000VELOX 100% Hydrogen Announcement

Turbomachinery Magazine• October 2023

HYFLEXPOWER: First Gas Turbine Operating on 100% Hydrogen

Siemens Energy• 2024

Siemens Energy Hydrogen Power Plants

POWER Magazine• December 2024

Mission H2 Power: 100% Hydrogen HL Gas Turbine Development

Siemens Energy• April 2025

White Paper: Hydrogen Power with Siemens Energy Gas Turbines

Hydrogen gas turbines: common questions

Several already have. In 2023 a Siemens Energy SGT-400 ran on 100% renewable hydrogen in the EU HYFLEXPOWER project — a world first at industrial scale. GE Vernova's LM6000VELOX aeroderivative is contracted to run on 100% hydrogen at South Australia's Whyalla plant, and its heavy-duty 7HA-class turbines burn 50%+ hydrogen blends today. Mitsubishi Power's M501JAC co-fires ~30% hydrogen now, targeting 100%. So the honest answer is: 100% hydrogen combustion is proven, and commercial 100% units are arriving between 2026 and 2030.

A hydrogen-ready turbine is engineered from day one to burn variable blends of natural gas and hydrogen and to transition toward 100% hydrogen without replacing the machine. It uses advanced dry low-emissions (DLE) combustion tuned for hydrogen's faster flame speed and higher temperatures. "Hydrogen-ready CCGT" means the same capability in a combined-cycle configuration, where a steam bottoming cycle lifts efficiency above 64%.

The most efficient thermal power plants are H-class combined-cycle gas turbines, which exceed 64% net efficiency by pairing a gas turbine with a steam turbine that recovers exhaust heat. Running on hydrogen instead of natural gas does not materially lower that efficiency — the same high-efficiency machines are being made hydrogen-capable, so the emissions fall without giving up performance.

CCGT stands for Combined Cycle Gas Turbine. A gas turbine generates power, then its hot exhaust drives a Heat Recovery Steam Generator (HRSG) and steam turbine for a second round of generation — extracting far more energy from the same fuel than a simple-cycle turbine and reaching 60%+ efficiency.

They are available and shipping now. What is still scaling is the supply of affordable green hydrogen fuel — not the turbines. That is exactly why GRECO specifies hydrogen-ready generation from day one: the plant runs on natural gas or blends today and shifts to hydrogen as clean-hydrogen supply and price improve, with no re-powering.

In marketing material the two are used interchangeably, but they are worth separating. Hydrogen compatible usually means the machine can burn some proportion of hydrogen in a blend — often 30% to 50% — without modification. Hydrogen-ready is the stronger claim: the turbine is engineered so it can be converted to run on up to 100% hydrogen later without replacing it. When you are comparing suppliers, ask for the specific blend percentage the machine is certified for today and what the conversion to 100% actually involves, because the two terms hide a large difference in commitment.

The turbine is only one part of it. A hydrogen-ready power plant means the whole facility can make the switch: fuel delivery and storage sized for hydrogen's much lower volumetric energy density, piping and seals rated for a smaller molecule that leaks more readily, revised gas detection and ventilation, and combustion controls tuned for a faster flame. A hydrogen-ready turbine inside a plant that cannot deliver hydrogen to it is not a hydrogen-ready plant. This is why the readiness decision belongs at the campus design stage rather than the equipment order.

No — scale decides the machine. Below roughly 20 MW GRECO uses solid oxide fuel cells, which convert gas electrochemically with no flame and therefore near-zero NOx, which is what makes them permittable on urban sites where a turbine would not be. Above roughly 20 MW, combined cycle earns its place because the second steam cycle pays for itself at that size. Either way the heat is recovered and sold into district energy.

Power that arrives with the campus

Turbines are the answer above roughly 20 MW. Below that GRECO uses solid oxide fuel cells, which have no flame and therefore near-zero NOx — the difference between permittable on an urban site and not. Scale decides the machine.