Washington also signed 28-year-old forward John Albert. He and Smith-Pelly could compete for depth roles in Washington.
The team has committed $139 million to three players in the past 10 days.
The team was mostly quiet as former players Karl Alzner, Kevin Shattenkirk and Justin Williams cashed in elsewhere.
Sorenson had been at CSN since 2005.
D.C.'s average fan satisfaction index ranks eighth among the 11 markets surveyed by J.D. Power.
The Redskins, Capitals and Wizards are all scheduled to play on Oct. 29. Game 5 of the World Series is also that day.
The latest rumors, expected signings and more free agency news.
Barry Trotz's current contract does not extend beyond the coming season, and he insists that he is just fine with that.
Orlov, 25, scored a career-high 33 points (six goals and 27 assists) in 82 games with the Capitals during last season.
July 1 is always one of the busiest days in the NHL. But with limited cap space, and facing a market with limited free agents, the Capitals are expected to be relatively idle.
The Capitals right wing addressed his impending free agency following the Quicken Loans National pro-am.
Copley’s contract is two-way next season with him being paid $650,000 when he is in the NHL and then $200,000 when he is playing in the American Hockey League. The contract then turns to a one-way during the 2018-19 season.
"I know it's developmental camp, but he certainly looked like a guy who would fit great in Hershey as a left winger,” Bears Coach Troy Mann said.