D.C. Code § 1-204.93
There shall be a Public Service Commission whose function shall be to insure that every public utility doing business within the District of Columbia is required to furnish service and facilities reasonably safe and adequate and in all respects just and reasonable. The charge made by any such public utility for any facility or services furnished, or rendered, or to be furnished or rendered, shall be reasonable, just, and nondiscriminatory. Every unjust or unreasonable or discriminating charge for such facility or service is prohibited and is hereby declared unlawful.
D.C. Code § 1-204.93
Deregulation of streetlighting service: Section 130 of H.R. 3067, amended by H.R. 99-419, incorporated in Pub. L. 99-190 by § 101(c), the D.C. Appropriation Act, 1986, provided that the Public Service Commission is authorized to order and to approve the deregulation of streetlighting service to the District of Columbia as provided in its opinion and order in Formal Case No. 813, dated July 12, 1984 (Order No. 8056), this section, § 34-1101, and § 34-1407, and provided that the provisions of this opinion and order regarding deregulation of streetlighting service are hereby ratified and declared to be in effect as of July 12, 1984 and shall continue to be in effect until revoked or rescinded.