Question 1

Which gas turbines can run on 100% hydrogen today?

Accepted Answer

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.

Question 2

What is a hydrogen-ready gas turbine (or hydrogen-ready CCGT)?

Accepted Answer

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%.

Question 3

What is the most efficient combined-cycle gas turbine, and does hydrogen change that?

Accepted Answer

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.

Question 4

What does CCGT stand for?

Accepted Answer

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.

Question 5

Are hydrogen-ready turbines available now, or is this future technology?

Accepted Answer

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.

Hydrogen-ready gas turbines: which CCGTs run on 100% hydrogen