forestry industry; papermills, sawmills, and its harbour are of some importance. Culture Piteå is known for its pitepalt, a food dish consisting of potato dumplings with chopped pork filling. The area is also known for its dialect, called Pitemål, which however is mainly spoken by elders in surrounding villages. Piteå has a fast food drive-thru commonly used by snowmobilers. The restaurant was a McDonald's from February 2002 to November 2007. Several McDonald's restaurants in Norrbotten closed at the time, in the face of competition from Max Hamburgers. The restaurant is now part of the Frasses hamburger chain. The drive-thru has received international coverage, including on The Travel Channel in an episode called "Most Unique McDonald's". Piteå has a sister city in the Caribbean: Gustavia, capital of Saint Barthélemy, the formerly Swedish possession that is now part of France. The School of music of Luleå University of Technology is located in Piteå. Cleantech Piteå has emerged as an important center of cleantech production and research based on cellulose byproducts. Chemrec operates a black liquor gasifier and the world's first BioDME production facility, SunPine has pioneered a renewable diesel process technology using crude tall oil as feedstock, and ETC (Energy Technology Centre in Piteå) is a research and development center for renewable fuels with focus on combustion, gasification and biorefining processes. Sport The Piteå IF football team is playing in the fourth highest Swedish division, Division 2 for men; and the Piteå IF ladies team is for their first time playing in the highest league in football, Damallsvenskan. Ice hockey is the big sport in town, even though Piteå HC only plays in the third-highest League (Division I) in Sweden. The club has provided many good players to the NHL and national team: examples are Tomas Holmström, Mikael Renberg, Mattias Öhlund, Lars Lindgren, Stefan Persson, Jan Sandström and Mats Lavander. Munksund-Skuthamns SK ladies team is, for their first time, playing in the highest league in Hockey, Riksserien. Rebecka Stenberg became the first woman from Piteå to play for the Swedish national team. In cross-country skiing the town has a successful club called Piteå Elit, with skiers like Lina Andersson, Magdalena Pajala and Charlotte Kalla. In competitive swimming, the town has a very successful team called Piteå Sim which is famous all over Norrland especially Norrbotten. One of the most famous swimmers in the club is 13-year-old Heidi Nilsson who got first place