OTTAWA - Brendan Bell scored Ottawa's third power-play goal of the game with 1:22 remaining to lift the Senators to a 3-2 win over the Washington Capitals on Tuesday night.
Bell put a shot from the right side past Jose Theodore 18:38 into the third with five seconds remaining in a penalty to Washington's Alexander Semin.
Dany Heatley scored a pair of power-play goals in the first to stake the Senators to a 2-0 lead.
Brian Elliott started his fifth in a row for Ottawa, which has seven points in four games (3-0-1), including a 5-4 shootout loss to Montreal on Saturday.
Sergei Fedorov and David Steckel scored in the second to help the Capitals erase a two-goal deficit and tie it at 2-2 midway through the middle period.
Semin was called for tripping with 3:17 remaining after he upended Senators captain Daniel Alfredsson while he was carrying the puck through the neutral zone.
Washington ended a three-game winning streak following a 2-1 road win in overtime Monday night over the New York Islanders. The Capitals had won 16 of their previous 21.
Theodore, 9-2-0 in his previous 11 starts, made 31 saves in his fifth straight start.
Ottawa's Peter Regin made his NHL debut. A 22-year-old chosen in the third round of the 2004 draft, Regin was called up from Binghamton of the AHL earlier in the day and became the fifth Danish-born player in league history, centring a line with Mike Fisher and Nick Foligno.
Fedorov scored his fifth goal of the season 37 seconds into the second, moments after a lengthy video review determined that an earlier shot by Fedorov had not entered the net.
The Russian veteran left no doubt on his next shot as he one-timed pass from Semin and drove a slap shot from the slot between Brian Elliott's pads to draw Washington within 2-1.
Steckel tied it at 2-2 with his sixth goal at 9:58.
Heatley opened the scoring with his 20th goal 8:11 in. The two-time 50-goal scorer made it a two-goal lead at 15:54 with his second goal of the period, his team-leading 21st.
Notes: Senators head coach Craig Hartsburg recorded his 200th career NHL coaching win ... On the night of President Barack Obama's inauguration, the Capitals played their second road game in Ottawa this season. They also played the Senators in a 2-1 overtime loss at Scotiabank Place on Nov. 4, the night of the presidential election ... Washington C Michael Nylander was a healthy scratch for the third time this season ... Senators RW Chris Neil was sick with the flu and out of the lineup.