Pursuant to 18 CFR 35.2, (Title 18 — Conservation of Electricity and Water Resources; Chapter I – Federal Energy Regulatory Commission, Ministry of Energy; Sub-chapter B – Provisions of the Federal Power Act; Part 35 – Submission of Tariff Plans and Tariffs; Subsection A – Application), the concept of service contract, as used here, means “an agreement that authorizes a customer to use an electrical service under the terms of a tariff. A service contract must be required in writing. Any oratory agreement or agreement forming part of such a declaration must be reduced to and form part of the written form. . . .