The US Treasury’s proposed guidelines on green hydrogen production, published in December, call for three requirements or “pillars” that will ensure H2 is truly green and will not lead to increased emissions: additionality, temporality, and deliverability.
“Additionality” means that the green hydrogen would have to produced from new renewables projects, so that they do not utilise existing clean electricity facilities that would otherwise help decarbonise the power grid.
For this pillar, the Treasury wants hydrogen producers to source their power from zero-carbon projects built within three years of the H2 project.
“Temporality” relates to how frequently producers would have to prove that their electrolysers have been powered by 100% renewable energy — usually hourly, weekly, monthly or annually — and therefore to what extent they can use grid electricity at times when the wind isn’t blowing and the sun isn’t shining, and then send the same anount of renewable energy back to the grid at a later date.
Here, the Treasury is calling for renewable power to matched on an annual basis up to 2028, and then hourly from then on.
“Deliverability” — or geographic correlation — relates to how physically close the hydrogen-producing electrolysers are to the source of renewable energy they use. Distances can be set to ensure that an electrolyser in, say, Texas, is not powered by solar panels in California through renewable energy credits, which in practice could mean that green power is sent to a grid that doesn’t need it, with the electricity actually used by the electrolyser coming from fossil-fuel power plants.
The US Treasury wants green hydrogen projects to be within the same regional grid as the renewable energy projects powering them.
