The Commission, by such rules and regulations or orders as it deems necessary or appropriate in the public interest or for the protection of investors, shall provide for the consolidation of applications, reports, and proceedings under this subchapter with registration statements, applications, reports, and proceedings under the Securities Act of 1933 [
15 U.S.C.
77a et seq.], the Securities Exchange Act of 1934 [
15 U.S.C.
78a et seq.], or the Public Utility Holding Company Act of 1935.