2211. ELECTRIC POWER GENERATION, TRANSMISSION AND DISTRIBUTION

22111. ELECTRIC POWER GENERATION
22112. ELECTRIC POWER TRANSMISSION, CONTROL AND DISTRIBUTION

2212. NATURAL GAS DISTRIBUTION

22121. NATURAL GAS DISTRIBUTION

2213. WATER, SEWAGE AND OTHER SYSTEMS

22131. WATER SUPPLY AND IRRIGATION SYSTEMS
22132. SEWAGE TREATMENT FACILITIES
22133. STEAM AND AIR-CONDITIONING SUPPLY