Click the link above to view the North Coast Gas Transmission Tariff on the PUCO website. The Public Utilities Commission of Ohio (PUCO) is charged with the regulation of utility services, including electric and natural gas companies, local and long distance telephone companies, water and wastewater companies, rail and trucking companies throughout the state of Ohio. One vehicle for this regulatory process is a tariff, which isis a collection of rules that define the relationship between a utility and its customers.