Except as otherwise provided by this section, a municipal power agency may acquire all real or personal property that it deems necessary for carrying out the purposes of sections 453.51 to 453.62, whether in fee simple absolute or a lesser interest, by condemnation and the exercise of the power of eminent domain in accordance with chapter 117. A municipal power agency shall have no power of eminent domain with respect to any real or personal property owned by any person as part of a system, whether existing, under construction, or being planned, of facilities for the generation, transmission, or distribution of electric power. The authority of a municipal power agency to acquire real or personal property by condemnation or the exercise of the power of eminent domain shall be a continuing power, and no exercise thereof shall exhaust it.