For purposes of this part—

(a) Formal investigation means an investigation instituted by a Commission Order of Investigation.

(b) Preliminary Investigation means an inquiry conducted by the Commission or its staff, other than a formal investigation.

(c) Investigating officer means the individual(s) designated by the Commission in an Order of Investigation as Officer(s) of the Commission.

(d) Enforcement Hotline is a forum in which to address quickly and informally any matter within the Commission's jurisdiction concerning natural gas pipelines, oil pipelines, electric utilities and hydroelectric projects.

[43 FR 27174, June 23, 1978, as amended by Order 602, 64 FR 17097, Apr. 8, 1999]