The Prairie Island Tribal Council has reached a tentative agreement with Xcel Energy to allow additional storage casks at the Prairie Island nuclear plant. If ratified next month by tribal members, the agreement would mean one less obstacle for Xcel as it seeks approval from the Legislature to store more nuclear waste at the site. Officials say if no additional storage is granted, the plant will have to shut down in 2007. Minnesota Public Radio's Marisa Helms reports.