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Glossary · Energy industry & energy transition

H2-ready

H2-ready hydrogen gas-fired power plant hydrogen network power plant strategy natural gas retrofitting Infrastructure security of supply Decarbonization

H2-ready, in German also called "wasserstofffähig" or "für den Wasserstoffbetrieb vorbereitet" (prepared for hydrogen operation), refers to plants, components or infrastructure that are initially operated with natural gas but can later be converted, wholly or partly, to hydrogen. The term is used mainly for gas turbines and gas-fired power plants, gas pipelines, underground storage facilities, industrial furnaces and individual grid components. What is meant is prepared convertibility: the plant is to be usable today and to be capable of running on hydrogen later without a complete rebuild.

In the power system the term is particularly important because new gas-fired power plants are intended as a dispatchable safeguard for periods with little wind and solar power. They provide short-term firm capacity. If they are run permanently on natural gas, however, this causes emissions and dependencies that are hard to reconcile with climate targets. H2-ready is meant to ease this conflict. The term describes an option for the future, not a result that has already been achieved.

Technical meaning and limits

H2-ready is not a measurable physical quantity such as output in megawatts. The term describes a claim of convertibility whose content has to be specified in each case. For a gas turbine it can mean that it tolerates a certain share of hydrogen in the fuel gas, for example 30, 50 or 100 percent. It can also mean that operation with pure hydrogen is possible only after burners or other components have been replaced. For gas pipelines, the question is whether pipe materials, seals, compressors, measuring devices and safety concepts are suitable for hydrogen or can be retrofitted. For storage facilities, geological conditions, gas purity, microbiological processes and the operating concept also come into play.

Technically, hydrogen behaves differently from methane, the main component of natural gas. Its volumetric energy density is significantly lower: one standard cubic metre of hydrogen contains only about one third of the energy of methane. Hydrogen diffuses more easily, can embrittle certain steels, burns with a much higher flame speed and, when burned in air, tends to cause higher nitrogen oxide emissions if the burner technology is not adapted. A plant that burns natural gas cleanly is therefore not automatically suitable for hydrogen. A reliable H2-ready statement must say which parts are already suitable, which must be replaced, how long the conversion takes and what it costs.

An example concerning percentages: if a turbine tolerates 30 percent hydrogen by volume, the hydrogen, because of its low calorific value, accounts for only a little over one tenth of the energy supplied. Volume share and energy share must therefore not be confused. Moreover, a plant that tolerates a blend is not yet suitable for pure hydrogen. High shares often require different burners, compressors, seals, safety technology and operational management.

Legal framework in Germany: StromVKG

In Germany, H2-ready is now defined by law for certain power plants. The Electricity Security of Supply and Capacity Act (Strom-Versorgungssicherheits- und Kapazitätengesetz, StromVKG) of 21 July 2026 introduces a capacity mechanism: what is remunerated is the provision of firm capacity from 1 November 2031, not the quantity of electricity generated. The first tenders for long-term capacity are scheduled for 8 September and 29 December 2026, each for 4.5 gigawatts. Participating plants must be able to feed in 80 percent of their installed capacity for at least ten hours without interruption. Irrespective of the technology, a limit of 550 grams of fossil CO₂ per kilowatt-hour of electricity applies.

Under § 17 StromVKG, a power plant that bids for a commitment period of 15 years and predominantly uses natural gas must be prepared for operation with hydrogen. This is the case if it is planned and built in such a way that operation with 100 percent hydrogen can be achieved by changing plant components or operation. The bidder must submit a conversion concept with its bid. The law thus requires the ability to run on pure hydrogen after a conversion, but not operation with hydrogen today.

According to the government draft, all power plants supported under the law must be climate-neutral by 2045 at the latest. In addition, incentives are planned to convert a total of 4 gigawatts of gas-fired power plant capacity to hydrogen before 2045. Politically, 2 gigawatts by 2040 and a further 2 gigawatts by 2043 were communicated for this purpose. This earlier conversion is to be incentivised through separate tenders from 2027, for example with contracts for difference for the higher fuel costs. According to the sources reviewed, the law contains no generally binding conversion deadline before 2045. Environmental associations criticise that the definition of hydrogen capability is too vague and that the conversion comes too late.

EU framework: Taxonomy

The EU Taxonomy, the classification system for sustainable investments, also relies on a later fuel switch for gas-fired power plants. Under the complementary delegated act of 2022, natural gas power plants with a construction permit granted by the end of 2030 can, under strict conditions, qualify as a transitional activity. These conditions include direct emissions below 270 grams of CO₂ equivalent per kilowatt-hour, or a corresponding annual average relative to installed capacity, as well as a complete switch to renewable or low-carbon gases by 31 December 2035. These criteria concern classification for financial markets. They are not an operating permit and differ significantly from the rules of the StromVKG.

Distinctions: hydrogen-fuelled, climate-neutral, power-to-gas

H2-ready does not mean that a plant runs on hydrogen today, nor that its operation is climate-neutral. A new H2-ready power plant can burn natural gas for many years, and the emissions during that time actually occur. It also matters where the hydrogen comes from. Green hydrogen is produced by electrolysis with renewable electricity. Grey hydrogen from natural gas without CO₂ capture causes considerable emissions. Depending on the definition, low-carbon hydrogen can also come from natural gas with CO₂ capture. According to the sources reviewed, the StromVKG does not prescribe a particular hydrogen colour but requires climate neutrality from 2045.

H2-ready must also be distinguished from power-to-gas. Power-to-gas refers to the conversion of electricity into hydrogen or synthetic methane, that is, the production of an energy carrier. H2-ready, by contrast, describes whether a plant or infrastructure can later take up or use this energy carrier.

Significance for security of supply and infrastructure

A power system with a lot of wind and solar energy needs capacity that is also available during long periods of low renewable feed-in, for example in a Dunkelflaute (prolonged period of little wind and sun). Such capacity covers the residual load, that is, the demand left over after wind and solar power have been deducted. Such plants often run only a few hours a year. Their value therefore lies more in availability than in the quantity of electricity generated. This is why the German legislator relies on a capacity market rather than on revenues from electricity sales alone. H2-ready power plants thus contribute to security of supply. Whether they are the cheapest option depends on the comparison with other forms of flexibility, such as storage, load shifting or imports.

A technically prepared power plant is of little use if it cannot obtain hydrogen. This requires a connection to a hydrogen network, storage, supply contracts and sufficient production or imports, precisely in the hours in which the power system needs capacity. Annual quantities alone are not enough. In addition, industry, chemicals, transport and power generation compete for the same scarce volumes. Because of conversion losses, electricity from hydrogen has high variable costs. It is better suited to rare deployments that are important for the system than to permanent operation.

Typical misunderstandings

  • H2-ready is not a guarantee of later climate neutrality. Without a binding conversion pathway, access to suitable hydrogen and economic operating conditions, such a plant can in practice remain a natural gas power plant. The StromVKG therefore links the support to a commitment to climate neutrality from 2045.

  • Tolerance of a blend does not mean suitability for pure hydrogen. Percentages must always be stated with their reference basis (volume or energy) and the technical context.

  • H2-ready is not automatically cost-efficient. The preparation increases the initial investment, a later conversion causes further costs and downtime, and expensive hydrogen can make operation permanently dependent on support.

Assessment

H2-ready is not a quality seal that on its own justifies an energy policy decision. Without a corresponding requirement, new natural gas plants could be built that can hardly be decarbonised later. If the requirement is too vague, however, it can be used to justify projects whose conversion remains uncertain. Good rules therefore need minimum technical requirements, verifiable conversion concepts, deadlines, evidence of hydrogen supply and clear consequences if the conversion does not happen. Used precisely, H2-ready describes not a finished solution but a verifiable capability for conversion.

Sources

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Edited by eCMS on 12.11.2026 05:05

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