Hetch Hetchy Power System
E428593
The Hetch Hetchy Power System is a municipal hydroelectric power network that generates and delivers clean electricity to San Francisco and surrounding public facilities.
All labels observed (3)
| Label | Occurrences |
|---|---|
| Hetch Hetchy Power System canonical | 2 |
| Hetch Hetchy Project | 1 |
| Hetch Hetchy Regional Water System | 1 |
How this entity was disambiguated
This entity first appeared as the object of triple T4271782 — 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: Hetch Hetchy Power System Context triple: [San Francisco Public Utilities Commission, ownedInfrastructure, Hetch Hetchy Power System]
-
A.
Pepacton Reservoir
Pepacton Reservoir is a large man-made lake in the Catskill Mountains of New York that serves as a major component of New York City's drinking water supply system.
-
B.
Devil Canyon Powerplant
Devil Canyon Powerplant is a hydroelectric generating facility in Southern California that produces power as part of the State Water Project’s water conveyance and energy system.
-
C.
Bonneville Dam
Bonneville Dam is a major hydroelectric and navigation dam on the Columbia River in the Pacific Northwest, known for power generation, fish ladders, and its role in regional river management.
-
D.
Salt River Project
Salt River Project is a major public utility in Arizona that provides electricity and water to the Phoenix metropolitan area through a combination of power generation, transmission, and irrigation services.
-
E.
Folsom Dam
Folsom Dam is a large concrete dam on the American River in California that provides flood control, water storage, and hydroelectric power for the Sacramento region.
- 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: Hetch Hetchy Power System Target entity description: The Hetch Hetchy Power System is a municipal hydroelectric power network that generates and delivers clean electricity to San Francisco and surrounding public facilities.
-
A.
Pepacton Reservoir
Pepacton Reservoir is a large man-made lake in the Catskill Mountains of New York that serves as a major component of New York City's drinking water supply system.
-
B.
Devil Canyon Powerplant
Devil Canyon Powerplant is a hydroelectric generating facility in Southern California that produces power as part of the State Water Project’s water conveyance and energy system.
-
C.
Bonneville Dam
Bonneville Dam is a major hydroelectric and navigation dam on the Columbia River in the Pacific Northwest, known for power generation, fish ladders, and its role in regional river management.
-
D.
Salt River Project
Salt River Project is a major public utility in Arizona that provides electricity and water to the Phoenix metropolitan area through a combination of power generation, transmission, and irrigation services.
-
E.
Folsom Dam
Folsom Dam is a large concrete dam on the American River in California that provides flood control, water storage, and hydroelectric power for the Sacramento region.
- F. None of above. chosen
Statements (48)
| Predicate | Object |
|---|---|
| instanceOf |
hydroelectric power system
ⓘ
municipal utility infrastructure ⓘ |
| country |
United States of America
ⓘ
surface form:
United States
|
| emissionCharacteristic | low greenhouse gas emissions ⓘ |
| fuelType | renewable energy ⓘ |
| gridConnection | Pacific Gas and Electric Company transmission system ⓘ |
| hasPart |
Hetch Hetchy Aqueduct
NERFINISHED
ⓘ
Holm Penstock NERFINISHED ⓘ Holm Powerhouse NERFINISHED ⓘ Kirkwood Penstock NERFINISHED ⓘ Kirkwood Powerhouse NERFINISHED ⓘ Moccasin Low-Head Generating Plant NERFINISHED ⓘ Moccasin Penstock NERFINISHED ⓘ Moccasin Powerhouse NERFINISHED ⓘ Moccasin Reservoir NERFINISHED ⓘ Mountain Tunnel NERFINISHED ⓘ O'Shaughnessy Dam NERFINISHED ⓘ Priest Reservoir NERFINISHED ⓘ |
| inception | 1918 ⓘ |
| legalBasis | Raker Act NERFINISHED ⓘ |
| locatedIn |
California, United States
ⓘ
surface form:
California
|
| locatedInProtectedArea | Yosemite National Park NERFINISHED ⓘ |
| managingAgency | San Francisco Water Power Sewer NERFINISHED ⓘ |
| nearbyCity |
Groveland, California
NERFINISHED
ⓘ
Moccasin, California NERFINISHED ⓘ |
| operator | San Francisco Public Utilities Commission NERFINISHED ⓘ |
| ownedBy | City and County of San Francisco NERFINISHED ⓘ |
| partOf | Hetch Hetchy Regional Water System NERFINISHED ⓘ |
| primaryEnergySource | hydropower ⓘ |
| purpose |
airport power supply
ⓘ
electricity generation ⓘ municipal water supply support ⓘ public facilities power supply ⓘ public transit power supply ⓘ |
| regulator |
California Energy Commission
NERFINISHED
ⓘ
California Public Utilities Commission NERFINISHED ⓘ Federal Energy Regulatory Commission NERFINISHED ⓘ |
| serves |
City and County of San Francisco
NERFINISHED
ⓘ
San Francisco General Hospital NERFINISHED ⓘ San Francisco International Airport NERFINISHED ⓘ San Francisco Municipal Railway NERFINISHED ⓘ San Francisco municipal facilities ⓘ San Francisco public schools ⓘ |
| status | operational ⓘ |
| transmissionVoltageLevel |
115 kV
ⓘ
230 kV ⓘ |
| usesWaterFrom | Tuolumne River NERFINISHED ⓘ |
| waterRightHolder | City and County of San Francisco 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: Hetch Hetchy Power System Description of subject: The Hetch Hetchy Power System is a municipal hydroelectric power network that generates and delivers clean electricity to San Francisco and surrounding public facilities.
Referenced by (4)
Full triples — surface form annotated when it differs from this entity's canonical label.
this entity surface form:
Hetch Hetchy Project
this entity surface form:
Hetch Hetchy Regional Water System