England swept to a convincing 3-0 victory with a fine second half performance against Austria.
After an early Lianne Sanderson goal England fell away for a spell and may well have conceded an equaliser.
But goals by Eni Aluko and substitute Ellen White ensured that England's 100% qualifying record would be maintained.
National coach Powell said: "We died a bit after making a good start, but we sorted a few things out at half-time and did very well in the second half."
She added: "We had a few players missing, but the girls showed there's good competition for places and it was nice to see Ellen White getting a goal on debut."
Aluko had two early goalbound efforts saved by keeper Jasmin Pfeiler before setting up Sanderson for the 16th minute opener.
Sanderson met Aluko's cross from the right to send in a header that looped into the net off the shoulder of right back Susanna Gahleitner.
England were almost caught out in the 36th minute, when goalkeeper Karen Bardsley had to stretch to tip left back Susanna Hoeller's long range drive over the bar.
And nine minutes after the break right winger Daniella Tasch was unlucky with a 15 yard shot that bounced out off the underside of the England bar.
That sparked the home side back into life, however, and after a couple of chances went begging Aluko volleyed in the second goal from Sanderson's 68th minute pass.
Midfielder Fara Williams struck a superb 25 yard shot against the bar as England looked for further goals.
And they got one in stoppage time as White marked her first senior international appearance with a neatly finish from another excellent Sanderson pass.
England (4-2-1-3): Bardsley (New Jersey Sky Blue); Susi (Chelsea) (E. White (Leeds Carnegie) 62), F. White (Arsenal), Stoney (Chelsea), Unitt (Everton) (Rafferty (Chelsea) 87); Williams (Everton), Chapman (Chicago Red Stars); Sanderson (Philadelphia Independence); A. Scott (Boston Breakers), Aluko (St Louis Athletica), Yankey (Arsenal) (S. Smith (Leeds Carnegie) 87).
Substitutes: J. Scott (Everton), Brown (Everton), Bassett (Leeds Carnegie), Johnson (Everton).
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