The retail power market is commonly divided into several sectors for energy planning. These can include residential, commercial, industrial, agricultural, public agency and street lighting.
Markets and indices are broken down into a series of separate sections. The top level of separate classification is the sector level. In the UK market these are resources, general industrials, consumer goods, services, utilities, financials and investment trusts. Each sector is further broken down into sub-sectors. The utility sector is made up of three sub-sectors: electricity, gas distribution and water. The purpose of sectors and sub-sectors is to facilitate analysis of sector performance and of stock performance within sectors.