Maentwrog hydroelectric power station
E1026403
Maentwrog hydroelectric power station is a historic hydroelectric facility in North Wales that harnesses water from the nearby reservoirs and rivers to generate renewable electricity.
All labels observed (1)
| Label | Occurrences |
|---|---|
| Maentwrog hydroelectric power station canonical | 1 |
How this entity was disambiguated
This entity first appeared as the object of triple T13171798 — resolving that mention is where its identity was fixed. The disambiguator weighed these candidate entities and picked the highlighted one (or “None”, minting a new entity). This is how homonymy is resolved: the same surface form can point to different entities.
NED1
Entity disambiguation (via context triple)
gpt-5-mini-2025-08-07
Target entity: Maentwrog hydroelectric power station Context triple: [Maentwrog, hasNearbyFeature, Maentwrog hydroelectric power station]
-
A.
Rheidol hydroelectric scheme
The Rheidol hydroelectric scheme is a major hydroelectric power installation in Ceredigion, Wales, harnessing the River Rheidol to generate renewable electricity.
-
B.
Capel Celyn
Capel Celyn was a Welsh rural community in the Tryweryn Valley that became a symbol of Welsh nationalism after being controversially flooded in the 1960s to create a reservoir.
-
C.
Dinorwig Power Station
Dinorwig Power Station is a large pumped-storage hydroelectric power facility in Snowdonia, Wales, built inside a former slate quarry and known for providing rapid-response electricity to the UK grid.
-
D.
Vyrnwy Dam
Vyrnwy Dam is a historic stone-built dam in Powys, Wales, notable for creating Lake Vyrnwy and being one of the first large masonry dams in the United Kingdom.
-
E.
Derwent hydropower scheme
The Derwent hydropower scheme is a system of hydroelectric power stations and associated infrastructure that harnesses the flow of the River Derwent to generate renewable electricity.
- F. None of above. chosen
- G. Unsure - the case is ambiguous/there is not enough information to decide.
NED2
Entity disambiguation (via description)
gpt-5-mini-2025-08-07
Target entity: Maentwrog hydroelectric power station Target entity description: Maentwrog hydroelectric power station is a historic hydroelectric facility in North Wales that harnesses water from the nearby reservoirs and rivers to generate renewable electricity.
-
A.
Rheidol hydroelectric scheme
The Rheidol hydroelectric scheme is a major hydroelectric power installation in Ceredigion, Wales, harnessing the River Rheidol to generate renewable electricity.
-
B.
Capel Celyn
Capel Celyn was a Welsh rural community in the Tryweryn Valley that became a symbol of Welsh nationalism after being controversially flooded in the 1960s to create a reservoir.
-
C.
Dinorwig Power Station
Dinorwig Power Station is a large pumped-storage hydroelectric power facility in Snowdonia, Wales, built inside a former slate quarry and known for providing rapid-response electricity to the UK grid.
-
D.
Vyrnwy Dam
Vyrnwy Dam is a historic stone-built dam in Powys, Wales, notable for creating Lake Vyrnwy and being one of the first large masonry dams in the United Kingdom.
-
E.
Derwent hydropower scheme
The Derwent hydropower scheme is a system of hydroelectric power stations and associated infrastructure that harnesses the flow of the River Derwent to generate renewable electricity.
- F. None of above. chosen
Statements (47)
| Predicate | Object |
|---|---|
| instanceOf |
hydroelectric power station
ⓘ
power plant ⓘ |
| builtFor | Trawsfynydd nuclear power station (grid support and site power) NERFINISHED ⓘ |
| commissioned | 1928 ⓘ |
| constructionStart | 1920s ⓘ |
| country | United Kingdom ⓘ |
| designedFor | base-load and peak-load support ⓘ |
| energySource |
hydropower
ⓘ
renewable energy ⓘ |
| environmentalBenefit |
low-carbon electricity generation
ⓘ
reduction of greenhouse gas emissions ⓘ |
| fuelType | water ⓘ |
| gridConnection | National Grid (Great Britain) NERFINISHED ⓘ |
| hasBuildingUse | powerhouse ⓘ |
| hasInfrastructure |
penstocks
ⓘ
spillways ⓘ switchgear ⓘ transformers ⓘ |
| hasOutputType | alternating current electricity ⓘ |
| hasReservoirFunction | regulating flow for power generation GENERATED ⓘ |
| hasStatus | operational ⓘ |
| hasTechnology | conventional hydroelectric turbines ⓘ |
| hasTurbineType | Francis turbine ⓘ |
| heritageStatus | historic power station ⓘ |
| isExampleOf | early 20th-century hydroelectric engineering ⓘ |
| locatedIn |
Gwynedd
NERFINISHED
ⓘ
Maentwrog NERFINISHED ⓘ North Wales NERFINISHED ⓘ Snowdonia National Park NERFINISHED ⓘ Wales ⓘ |
| locatedNear |
Trawsfynydd
NERFINISHED
ⓘ
village of Maentwrog ⓘ |
| locatedOnRiver | Afon Prysor NERFINISHED ⓘ |
| nearProtectedArea | Snowdonia NERFINISHED ⓘ |
| ownedBy |
Magnox Ltd (historical association)
NERFINISHED
ⓘ
Nuclear Electric (historical) NERFINISHED ⓘ |
| partOf | North Wales hydroelectric infrastructure NERFINISHED ⓘ |
| powerType | run-of-river hydroelectric ⓘ |
| primaryFunction | electricity generation ⓘ |
| purpose | generation of renewable electricity ⓘ |
| region | north-west Wales NERFINISHED ⓘ |
| suppliesElectricityTo |
National Grid
NERFINISHED
ⓘ
local distribution network ⓘ |
| usesResource | gravity-fed water flow ⓘ |
| usesWaterFrom |
Trawsfynydd reservoir
NERFINISHED
ⓘ
nearby rivers ⓘ |
| waterIntakeFrom | Trawsfynydd lake NERFINISHED ⓘ |
How these facts were elicited
The pipeline generated the facts above by prompting gpt-5.1 with this entity's name + description and the instruction below.
Instruction
You are a knowledge base construction expert. Given a subject entity and a description of it, return factual statements that you know for the subject as a JSON list of dictionaries(triples), where keys must be "subject", "predicate" and "object". The number of facts may be very high, between 25 to 50 or more, for very popular subjects. For less popular subjects, the number of facts can be very low, like 5 or 10. # Requirements - If you don't know the subject at all, return an empty list. - If the subject is not a named entity, return an empty list. - Include at least one triple where predicate is "instanceOf". - Do not get too wordy. - Separate several objects into multiple triples with one object.
Input
Subject: Maentwrog hydroelectric power station Description of subject: Maentwrog hydroelectric power station is a historic hydroelectric facility in North Wales that harnesses water from the nearby reservoirs and rivers to generate renewable electricity.
Referenced by (1)
Full triples — surface form annotated when it differs from this entity's canonical label.