TAPS operates 24 hours a day, 365 days a year, as Alyeska’s employees work in Anchorage, Fairbanks, Valdez, and along the pipeline, from Pump Station 1 on the North Slope to oil spill prevention and response vessels in Prince William Sound.
Alyeska focuses on safe and flawless operations and sustainability, and works to respond to challenges posed by declining throughput. Throughput peaked at 2.1 million barrels a day in 1988, but has steadily decreased, averaging 480,199 barrels a day in 2020. With lower flow levels, the crude oil takes longer to reach the Valdez Terminal – about 2 weeks, on average – and the oil is colder on arrival. This affects operations all along TAPS, from pump stations where oil is recirculated to add heat, to Valdez where pigs arrive with more accumulated wax.
Alyeska continues researching and implementing adjustments necessary to operate TAPS safely and efficiently so that TAPS will remain a viable component of Alaska’s economy and the nation’s energy infrastructure.
TAPS throughput and Alaska oil
Since startup on June 20, 1977, TAPS has transported more than 18 billion barrels of Alaska North Slope crude from the North Slope to Valdez. When TAPS operations began, the pipeline moved 610,408 per day. At peak flow in 1988, 11 pump stations moved 2.1 million barrels of oil every day. Throughput in 2016 averaged 517,868 barrels a day, with four active pump stations remaining in the system. The 2016 average was the first increase in TAPS throughput since 2002. Throughput increased again in 2017, averaging 527,323 barrels a day, before dropping to 509,315 barrels a day in 2018. In 2019, TAPS daily throughput average dropped below 500,000 for the first time, ending at 490,366. In 2020, the daily throughput to 480,199 barrels.
Crude is a fluid made up of various hydrocarbon components, natural gas liquids and fixed gases. Alyeska does not own any crude oil produced on the North Slope. Alyeska takes custody of crude oil at Pump Station 1 on behalf of the TAPS owners, transports the oil across the state of Alaska to the port of Valdez, and loads the oil onto tankers. Once the oil is loaded onto tankers, Alyeska releases custody of the oil.
Pump stations were strategically built and located along the 800-mile TAPS route to keep the oil moving from the North Slope to Valdez, using booster pumps. TAPS was originally designed to operate with 12 pump stations, but only started with 11. Today only four are operational.
A consortium of companies owns TAPS. Alyeska Pipeline Service Company acts as TAPS operator and transportation service on behalf of the three TAPS owner companies. Currently, TAPS ownership and percentages* are:
- Harvest Alaska, LLC. 49.1069%
- ConocoPhillips Transportation Alaska, Inc. 29.6102%
- ExxonMobil Pipeline Company LLC 21.2829%
*Updated February 2022