Me. Rev. Stat. tit. 20-A, § 2402

Charter schools may be established as public schools pursuant to this chapter to improve pupil learning by creating more high-quality schools with high standards for pupil performance; to close achievement gaps between high-performing and low-performing groups of public school students; to increase high-quality educational opportunities within the public education system; to provide alternative learning environments for students who are not thriving in traditional school settings; to create new professional opportunities for teachers and other school personnel; to encourage the use of different, high-quality models of teaching and other aspects of schooling; and to provide students, parents, community members and local entities with expanded opportunities for involvement in the public education system.