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This invention describes a method for storing hydrogen gas deep underground. When hydrogen isn't in high demand, it's injected into a subsurface reservoir and mixed with other gases such as methane, ethane, or carbon dioxide. Later, when hydrogen sales are high, it can be extracted from the reservoir. The method specifically uses existing gas transportation infrastructure and geological formations like salt caverns or depleted gas reservoirs.
Why it matters: The increasing focus on cost-effective, large-scale hydrogen storage solutions since 2023 has highlighted the potential of repurposing existing subsurface infrastructure. This makes methods for co-mingling hydrogen with other gases, as described, more pertinent for leveraging current assets.
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