Minister of Power, Bart Nnaji, Resigns

They didn't say why he resigned, just that President Jonathan has accepted his resignation and wishes him well.
A statement from the Presidency below

    “President Goodluck Ebele Jonathan has accepted the resignation with immediate effect of the Minister of Power, Prof. Barth Nnaji. President Jonathan thanks Prof. Nnaji for his services to the nation under the present administration and wishes him well in his future endeavours.”