SwePol is a 254.05-kilometre (157.86 mi)-long monopolar high-voltage direct current (HVDC) submarine cable between the Stärnö peninsula near Karlshamn, Sweden, and Bruskowo Wielkie, near Słupsk, Poland.

It runs for 2.22 kilometres (1.38 mi) as an underground cable from the Stärno HVDC Station to the shore of the Baltic Sea.

The 239.28 kilometres (148.68 mi) long submarine cable comes ashore in Poland near Ustka at 54°34′25″N 16°46′57″E / 54.57361°N 16.78250°E / 54.57361; 16.78250 (SwePol enters Poland) and runs underground for the remaining 12.55 kilometres (7.80 mi) to Bruskowo Wielkie HVDC Static Inverter Plant.

Unlike other monopolar HVDC schemes, Swepol uses a metallic return consisting of 2 cables with 630 square millimetres (0.98 sq in) sections for the submarine portion of the line, and a single cable with 1,100 square millimetres (1.7 sq in) sections for the land portions.

Both stations use air-core inductance smoothing rectifiers of 225 mH and a weight of 27.5 tonnes (61,000 lb), with filters for the 11th, 13th, 24th, and 36th harmonics.

It was initially owned and maintained by SwePol Link AB, a company jointly owned by the state-owned Swedish power company Svenska Kraftnät (51%), Vattenfall (16%), and Polish transmission system operator PSE-Operator (33%), but the company was liquidated and the cable was acquired by Svenska Kraftnät for the Swedish and PSE-Operator for the Polish part of the cable.

Causes have included ship anchors, fishing nets, fire, and grid power disturbances.

On 14 February 2005, the smoothing reactor at the HVDC station at Bruskowo Wielkie was destroyed by fire.

[2] Poland's power market will face a supply squeeze from 2025, when a tightening of EU rules on plants’ CO2 emissions will force nearly 5 GW of thermal capacity out of the system, the nation's TSO has warned.

[3] When the Nord Stream gas pipeline, also in the Baltic Sea, began to leak in September 2022 and sabotage was suspected, many people feared that the SwePol link had also been damaged.

The severe disturbance outage was caused by a fire in the AC filter on the Polish side in January, and it took 19 days to bring the HVDC link back online after it.

The annual maintenance period for SwePol occurred over a duraton of 29 days, spanning September and October.

The annual maintenance for SwePol took place during 13 days in October and the available technical capacity during the year was approximately 90%.