Holyrood Thermal Generating Station


The Holyrood Thermal Electric Generating Station built by Newfoundland and Labrador Hydro Corporation is located near the community of Holyrood, in Conception Bay, Newfoundland, Canada.

Holyrood Thermal Generating Station
Holyrood Generating Station
Holyrood Generating Station, Newfoundland
CountryCanada
LocationHolyrood, in Conception Bay, Newfoundland
Coordinates47°27′10.14″N 53°05′43.73″W
StatusOperational
Commission date1971
Owner(s)Newfoundland and Labrador Hydro
Thermal power station
Primary fuelFuel oil
Secondary fuelDiesel
Power generation
Nameplate capacity613.5 MW

Overview

The initial installation included two 150 megawatt (MW) turbine generators which are propelled by steam heated by two large oil burning furnaces.[1] The Number 6 fuel oil used in the plant[2] to keep the furnaces going is delivered by shuttle tankers to the marine terminal constructed as part of the project.

Newfoundland and Labrador Hydro's Holyrood Thermal Generating Station burns No. 6 heavy fuel oil at the rate of approximately 6,000 barrels (950 m3) per day, per unit at full load to produce steam at 1000 degrees Fahrenheit (540 degrees Celsius) and 13,790 kPa at a rate of over 500 megagrams per hour. In an average year it puts out pollution equivalent to 300,000 cars on the road.[3]

In a thermal generating station, fuel is burned in a boiler to convert water to steam. The high-pressure steam is directed into a turbine that is connected to an electrical generator that produces electricity as it turns. A seawater condenser is used for cooling the spent steam from the turbine, converting it back to water that is reused in the boiler. Holyrood uses over 250,000 litres per minute of sea water for cooling on each unit and 900,000 litres per day of fresh water for make up purpose.

The plant generators operate at 16,000 volts and 7000 amperes transformed up to 230,000 volts for transmission on the island grid to all parts of the system. It generates on average 15 to 25% of Newfoundland’s electricity—up to 30% of the island’s electricity needs at peak in the winter months.[3]

The plant has three smokestacks, one 360 ft (109.8 m) tall and two 300 ft (91.5 m) tall.[4] These are the tallest freestanding structures built on land in Newfoundland.

History

Holyrood was placed in service in 1971 with two 150 MW units.[5] A third 150 MW unit was added in 1980 to increase the output to 450 MW. In 1988/89 the original two units were modified to increase the plant capacity to 490 MW.[6] In 2014, a 123.5 MW diesel combustion turbine was installed.[7]

See also

References
  1. "NL Hydro | Power Your Knowledge". Archived from the original on 2014-01-06. Retrieved 2014-01-06.
  2. "Archived copy" (PDF). Archived from the original (PDF) on 2014-01-06. Retrieved 2014-01-06.{{cite web}}: CS1 maint: archived copy as title (link)
  3. "Environmental Benefits of Closing the Holyrood Thermal Generating Station" (PDF). Muskratfalls.nalcorenergy.com. Retrieved 2022-02-11.
  4. "Environment and Climate Change Canada - NPRI Data Search". Ec.gc.ca.
  5. "Archived copy" (PDF). Archived from the original (PDF) on 2014-01-06. Retrieved 2014-01-06.{{cite web}}: CS1 maint: archived copy as title (link)
  6. "Newfoundland and Labrador Hydro - Operations - Thermal Generation". Archived from the original on 2010-06-06.
  7. "New combustion turbine at Holyrood running at full capacity". Cbc.ca. Retrieved 2022-02-11.
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