On Selling Electricity and Electricity Market Operation

**Exclusions/References:** - Units mainly engaged in - (a) trading in electricity contracts are included in Division K Financial and Insurance Services; - (b) the construction of electricity or other transmission lines or towers, pipelines, or any other civil engineering projects are included in Class 3109 Other Heavy and Civil Engineering Construction; and - (c) the installation of electrical wiring or fittings in buildings or other construction projects are included in Class 3232 Electrical Services. **Primary Activities:** - Electricity market operation - Electricity retailing - Electricity wholesaling