B. A public utility shall not be required, as a prerequisite to its filing of its petition for the condemnation of property necessary for ordinary extensions or improvements of its facilities within the territory in which it is lawfully authorized to operate, for use in public utility service, to obtain a certificate from the State Corporation Commission under the Utility Facilities Act, Chapter 10.1 (§ 56-265.1 et seq.) of Title 56. This subsection shall not be construed to exempt a public utility from the requirements of § 25.1-102 when the condemnation would take property of another corporation possessing the power of eminent domain.