(a) This chapter is intended to aid the state in the execution of its duties by providing appropriate and independent instrumentalities of the state with full and adequate power to fulfill their functions.
(b) Except as otherwise expressly provided in this chapter, it shall not be necessary for any improvement authority incorporated under this chapter to obtain, prior to engaging in an enterprise of furnishing a service or acquiring, constructing, reconstructing, improving or extending a plant system, any certificate of convenience or necessity, franchise, license, permit or any other authorization from any board, bureau, commission, department or other like agency of the state or any county, city or town of the state.