WASHINGTON (AP) -- An electrical outage that interrupted Friday night's Pirates-Nationals game didn't do much to stop Jose Bautista.
He homered twice and drove in four runs to help Pittsburgh beat Washington 11-4, ending the Nationals' season-high four-game winning streak.
"He's been working awfully hard with the hitting coach [Don Long] to correct a couple of things we thought would make him better, and he's really stayed with it," Pirates manager John Russell said of Bautista. "He's gotten much better every game."
Bautista said Long's tweaks to his stance didn't give him more power, but provided a better foundation for success at the plate.
"With me, I think it's getting into a good hitting position on time and being able to hit the ball," he said. "A lot of times, I get into a good position, but then I miss my pitch. I've just got to make sure I can capitalize on them when I get them."
The game was delayed 25 minutes in the bottom of the fourth when rows of lights along the left- and right-field lines went dark. Umpires huddled with Nationals Park operations staff before the teams retreated to their dugouts to wait out the power failure.
Damaso Marte (2-0) pitched two hitless innings, and the Pirates bullpen gave up one hit in five innings.
Pittsburgh took a 6-0 lead in the third, sending nine men to the plate and breaking John Lannan's scoreless streak at a Nationals-record 21 innings.
"He just didn't have it. He's human," Washington manager Manny Acta said. "I'm not expecting him every five days to go out there and throw seven scoreless innings for us. His location just wasn't there."
Nate McLouth led off with a double and Jason Bay drew a one-out walk before consecutive run-scoring singles to center by Doumit and Xavier Nady. Doug Mientkiewicz followed with a slowly hit fielder's choice to short, but second baseman Felipe Lopez mishandled Cristian Guzman's throw and Doumit scored.
Bautista then ripped Lannan's 1-2 pitch over the center-field wall for his second homer of the season.
Lannan (2-3) left after allowing six runs -- five earned -- on six hits and two walks in three innings.
"I really didn't have anything on my slider, or anything else. They fouled off pitches, they battled and waited for a pitch to hit," Lannan said. "I made some mistakes and stunk today."
Lopez hit an RBI double in the third, but Doumit's run-scoring single in the fourth made it 7-1.
Pirates starter Phil Dumatrait retired the first eight hitters, but struggled after the lighting malfunction, which followed Ryan Zimmerman's leadoff infield single in the fourth. The left-hander allowed a one-out double to Lastings Milledge and walked Austin Kearns to load the bases, then allowed Wily Mo Pena's sacrifice fly and a two-run double by Wil Nieves.
Bidding for his first major league victory, Dumatrait was undone by the delay.
"I was throwing the ball pretty well and it took me out of the groove. ... Obviously, after the delay I wasn't as sharp," he said. "A couple times, I went down into the cage, tried to play catch and tried to stay loose."
Bautista added a fifth-inning solo homer off Mike O'Connor for his second career two-homer game.
Dumatrait went four innings, giving up four runs on six hits, walking one and striking out four.
Gomez added a two-run single in the seventh, making it 10-4. Bay had an RBI double in the eighth.
Bautista's other two-homer game came Aug. 25, 2007, for Pittsburgh at Houston. ... Paul Lo Duca, activated off the 15-day DL by Washington before the game after missing time with a right hand contusion, singled in the third as a pinch hitter. ... The electrical malfunction and the game's slow pace forced the cancellation of a postgame fireworks display. Nationals president Stan Kasten explained that an agreement with neighbors of Nationals Park precluded any fireworks from being launched after 11 p.m. Disappointed fans in the crowd of 26,001 chanted "We want fireworks" intermittently through the final two innings after being informed of the cancellation. ... The victory was the 9,400th in the Pirates' 122-year history. ... Playing for Triple-A Columbus on a rehab assignment, Nationals OF Elijah Dukes, on the 15-day DL with a right hamstring injury, was 3-for-4 with a two-run double and a stolen base.