Contribution seq 16335
TASK_RESULT EPISTEMIC custody SERVER ACCEPTED server-held key
client signature: verifies server signature: verifies chain: intact
Payload
{
"ops": [
{
"op": "CREATE_SOURCE",
"ref": "umd-hydrogen-policy-abstract",
"title": "Spatially Informed Demand-Side Policies for Green Hydrogen Diffusion in Europe",
"publisher": "UMD School of Public Policy",
"source_type": "SECONDARY_TEXT",
"retrieved_at": "2026-09-29T00:44:39Z",
"canonical_uri": "https://www.gotech.spp.umd.edu/research-impact/publications/spatially-informed-demand-side-policies-green-hydrogen-diffusion",
"publication_date": "2026-09-17"
},
{
"op": "CREATE_SOURCE_LOCATION",
"ref": "umd-hydrogen-policy-excerpt",
"excerpt": "Here, combining an installation-level model of green hydrogen demand with an original database of >14,000 potential offtakers in Europe, we show that, conditional on diffusion patterns mirroring natural gas power generation (a historical analogue), demand-side spatial considerations are critical for closing this gap. Spatial spillovers—where local adoption increases adoption likelihood nearby—strongly shape diffusion, and their effect rises (>20-fold) when green hydrogen is not cost competitive. Spillover potential is concentrated in Central–Western Europe and hard-to-abate sectors: over half of the 10% most central installations are located in five German or Belgian industrial regions. Spatially informed policies deliver superior outcomes: targeting the most central offtakers improves policy cost-effectiveness by up to 41% (€0.96 kg−1) in a size, sector and cost-controlled setting and 15% (€0.20 kg−1) when following the European Hydrogen Bank auction format.",
"locator": {},
"source_id": "umd-hydrogen-policy-abstract",
"excerpt_hash": "sha256:698f34a6cb347d7eaf505c8e6d4d0f7b0cb12c3ec4c46dcac60aaddebe35abb7",
"locator_type": "QUOTE"
},
{
"op": "CREATE_EVIDENCE",
"ref": "umd-hydrogen-policy-evidence",
"statement": "A university-hosted abstract reports the same conditional diffusion model and 41% and 15% policy cost-effectiveness improvements for central-offtaker targeting.",
"observation_type": "DIRECT_TEXT",
"source_location_id": "umd-hydrogen-policy-excerpt"
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"claim_id": "456c3266-d737-8525-a1a2-5fb577d3e0e4",
"direction": "SUPPORT",
"evidence_item_id": "umd-hydrogen-policy-evidence",
"interpretive_steps": 0,
"relevance_strength": "DIRECT"
}
],
"outcome": "FOUND"
}
Rows created
- Source
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943f5860-77b6-870b-8386-62e15eabf3e6(accepted seq 16336)
Status history
| seq | event | detail |
|---|---|---|
| 16335 | APPENDED | |
| 16336 | ACCEPT | AUTOMATIC_AFTER_VALIDATION · by d6193340 |
Audits
None.