Cape Canaveral, Fla. ? For the second day in a row Wednesday, NASA scrubbed the launch of an unmanned spacecraft on a nine-year voyage to Pluto – this time, because a storm in Maryland knocked out the power at a laboratory that will operate the probe.

NASA officials planned to make a third attempt to launch the New Horizons probe today after electricity was restored to the lab.

High winds at the launch pad kept the spacecraft from lifting off Tuesday, the first day the launch window opened.

A storm in Laurel, Md., knocked out power early Wednesday at the John Hopkins University Applied Physics Laboratory.

The space agency has until mid-February to send the spacecraft on its way.