By Bart H. Meijer, Andres Gonzalez and Christoph Steitz THE HAGUE/LONDON/FRANKFURT (Reuters) -The Dutch government is selling 46% of power grid operator TenneT's German unit to an investor consortium for up to 9.5 billion euros ($11.3 billion), it said, kicking off the separation from a business it has long been trying to divest. The sale to a consortium of Dutch pension fund manager APG, Singapore's sovereign wealth fund GIC and Norges Bank Investment Management (NBIM), operator of the world's No. 1 s ...