Del. Code Ann. tit. 26, § 206
Investigations
47 Del. Laws, c. 254, § 3; 26 Del. C. 1953, § 124; 59 Del. Laws, c. 397, § 1;
The Commission may investigate, upon its own initiative or upon complaint in writing, any matter concerning any public utility.
47 Del. Laws, c. 254, § 3; 26 Del. C. 1953, § 124; 59 Del. Laws, c. 397, § 1