power to gas energy storage .pdf
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Power to Gas Energy Storage
The ‘power’ is electricity that’s not yet used to light up homes, the ‘gas’ is hydrogen and the
process is simple electrolysis: separating the H2 and O components of water.
It’s widely understood to refer to power generated by renewables like wind and solar, and so
electrolysers have been designed especially to handle the intermittency.
The resulting hydrogen is easy to store — it can be turned back into electricity, converted to
natural gas-like methane, or used as fuel for hybrid cars.
As the proportion of renewable energy supply to the electricity grid increases, the ability to
match this unscheduled intermittent supply with demand becomes increasingly problematic. In
fact as the deployment meets and exceeds 20% capacity, as already experienced in many
countries, grid balancing issues become acute leading to the curtailment of wind. This is driving
the need for long term, large scale energy storage solutions.
Power-to-Gas Energy Storage is the process of converting surplus renewable energy into
hydrogen gas by rapid response electrolysis and its subsequent injection into the gas distribution
Most developed counties already own a vast energy storage infrastructure through the
pressurisation of existing transmission and distribution infrastructure. This allows it to be
recharged without the need of it being discharged first, so when the wind blows, this can be
taken and used to top up storage, this is critical for storing renewable energy which is
intermittent in its generation.
Power-to-Gas Energy Storage allows for the storage of significant amounts of energy and the
provision of CO2 neutral fuels in the form of the resulting renewable energy gas mix of hydrogen
The hydrogen produced is injected into the natural gas system to displace natural gas, so
reducing greenhouse gas emissions and reliance upon fuel imports. If the power is derived
mainly from renewable power sources, only low-carbon hydrogen will be produced. Thereby the
Power-to-Gas (P2G) approach can facilitate a transition from natural gas to a ‘green’ mixed gas
by making use of both of the existing energy grids on a global scale.
Power-to-Gas Energy Storage is a highly effective way of integrating renewables. It can
provide a rapid, dynamic http://www.crystaltcs.com/hydrogen-generation-systems.phpresponse
to the Independent Grid Operator’s signal to adjust to the variations in renewable generation
output. The siting of a Power-to-Gas facility is not restricted to any geologic formation as it can
be deployed wherever the power and gas grids intersect. It is a scalable technology.
Power-to-Gas provides the unparalleled energy storage capacity in the TWh range—seasonal
storage capability. It can charge energy several days, or even consecutive weeks, without
needing to discharge the stored energy.
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