2008-09: Petter Emanuelsson played in Sweden's U20 SuperElit league as a 17-year old. In 36 games with Skelleftea he scored 7 goals with 12 assists and was -3 with 14 penalty minutes. Skelleftea finished sixth in the regular season and lost to Djurgardens in the playoff quarterfinals. Emanuelsson shared the team scoring lead in the playoffs with Melker Karlsson and defenseman Adam Larsson (New Jersey), scoring 2 goals with 2 assists and finishing +1 with 4 penalty minutes in five playoff games. In nine games with Skelleftea's U18 team he scored 5 goals with 9 assists and had 2 penalty minutes.
2009-10: Emanuelsson made his debut in Sweden's Elitserien, recording an assist for Skelleftea in a 5-4 loss to Frolunda in a January game in his only appearance. He skated in 22 games for the Skelleftea U20 team, scoring 5 goals with 9 assists and was -3 with 2 penalty minutes.
2010-11: Emanuelsson played in three Elitserien games with Skelleftea and skated in Sweden's second league, Allsvenskan, with Sundsvall; spending most of the year with the Skelleftea U20 team. He had no points nor penalty minutes, averaging 8:46 minutes of ice time in his brief stint with Skelleftea. In five games for Sundsvall he scored 2 goals with 1 assist and was an even plus/minus. Emanuelsson scored 21 goals with 28 assists in 40 games with Skelleftea's junior team and had 14 penalty minutes.
2011-12: Emanuelsson split the season between Skelleftea in the Elitserien and Pitea HC in the Sweden's Division I league. He scored 1 goal in 17 games with Skelleftea and was -3 with 4 penalty minutes. Skelleftea finished second and Emanuelsson played in six playoff games; finishing -2 with no points or penalty minutes in limited ice time. He played 27 games for Pitea, scoring 16 goals with 9 assists, and was +10 with 10 penalty minutes. Emanuelsson played six games with Skelleftea's junior team and scored 2 goals with 3 assists.
2012-13: Emanuelsson played in a career-high 54 regular season games in his first full season with Elitserien champion Skelleftea. He scored 9 goals with 9 assists and was +9 with 8 penalty minutes; averaging 10:42 minutes of ice time. Skelleftea had the league's best record in the regular season and swept Lulea in the playoff finals. Emmanuelsson scored 6 goals with 2 assists and was +8 with 8 penalty minutes in 13 playoff games. He signed a two-year entry-level contract with San Jose as a free agent in June, 2013.
Petter Emanuelsson is a hardworking two-way forward with a very hard shot. His compete level is excellent, and he never gives up on a play. He has a quick powerful stride that is by far his most powerful asset. While he should never be considered a playmaker he does have a decent offensive toolkit and high-end projects to be a fast and competitive forechecking forward reminiscent of former Shark Torrey Mitchell.
Despite signing a two-year deal with the Sharks organization, Emanuelsson will be on loan to Skelleftea AIK of the SHL for the upcoming season.