IRAN STATISTICAL YEARBOOK 1395 9. WATER AND ELECTRICITY Introduction Water produced: the amount of water gained from he statistics appeared in this chapter have various (surface and underground) water resources Tbeen provided as register records by the Ministry such as wells, springs, subterranean canals, dams of Energy on two topics of "water" and and river basins. "electricity". Dam: a structure built against the flow of water to Water reserve water or change the direction of flow or This section includes information on manage it for satisfying different needs such as "underground waters", "reservoir dams", and drinking, industry, irrigation (agriculture), "length of networks and number of water and electricity generation and control of flood. sewage extensions". The related statistics have Reservoir dam: a dam made for reserving, been added to the Statistical Yearbook of Iran managing or controlling the flow of water to since the year 1346. reserve it for procuring water for irrigation, Statistics on underground waters and reservoir drinking, industry, electricity generation and dams have been provided by Water Resources control of flood Management Company and statistics on the length Large reservoir dam: refers to all dams with a of networks and number of water and sewage height of 15 metres or more as well as 10 to 15 extensions has been obtained from the Water and metres high dams having a reservoir with a Sewage Engineering Company. volume of 1 million cubic metres or more and/or a It is notworthy that Central and Internal basin, capacity of flood discharge of 2000 or more cubic Hamun basin, and Sarakhs basin were renamed by metres per second. Water Resources Management Organization as Inflow: annual volume of water entered the Central Plateau, Eastern Border and Qareh Qum, reservoir of a dam through the river. respectively, in the year 1383. Outflow: total annual volume of water discharged Electricity from different outlets of a dam (weir, silt ejector Data related to electric power industry was first channels, take-out gates, drainage channels) and collected in the year 1343 by the then Ministry of evaporation. Water and Power (renamed the Ministry of Water extension: refers to the part of branched- Energy in the year 1353). Since the year 1346, off water pipes, containing pipe, related the Ministry has regularly provided the annual accessories, with a profile appropriate to the water statistics on the power industrycomprising power metre and the extension capacity of public water, generation, transmission, distribution, and which connects a private water distribution line or consumption. The statistics, a part of which public water distribution network from installation appears in some tables of this yearbook, are place of the extension valve to the delivery point presented in various annual publications released (valve following the watermetre). by the Ministry. Public water distribution network: a collection of Moreover, through two successive censuses of interconnected pipe lines with needed pressure for population and housing in the years 1365 and distributing water for household, office and 1375, the SCI collected data on residential units industrial consumption in a region or inside the and households benefiting from piped water and city , all of which belong to the Water and Sewage electricity which are reflected in Chapter 10, Company. “Construction and Housing,” of the yearbook. Sewage extension: refers to the part of minor sewage pipelines, including pipes and related Definitions and concepts accessories, with a profile appropriate to siphon or Water basin: see Chapter 1, Definitions and contractual capacity, which carries joint sewages concepts. away from the siphon to the private line or to the Aquatic year: see Chapter 1, Definitions and public network for collecting sewages. concepts. 373 9. WATER AND ELECTRICITY IRAN STATISTICAL YEARBOOK 1395 Public network for collection and transmission Interconnected network: the collection of of sewage: refers to all installations and equipment, production sites and regions of energy such as main collectors, used for collection and consumption around the country connected transmission of sewage to water treatment house together with a network of transmission lines and and pump houses of urban sewage and public side high voltage stations. The network lets electricity networks, all belonging to the Water and Sewage exchange between the regions covered, and makes Company. The network is not responsible for the export of electric energy possible. collection, transmission and disposal of rainfall Isolated network (generation and power water flowing on passages, flood channels and consumption): refers to regional, provincial and channels inside and outside cities located in the island networks not connected with adjacent customers’ estates. networks or interconnected network. Nominal capacity (registered nominal power): Load-demand: the power consumed during a refers to the maximumexpected output of an certain period in a certain part of the network. electricity generator in designing condition Maximum coincidental load: in a full defined by the manufacturer. Nominal power is interconnected electricity system, maximum usually installed in KVA or KW for smaller coincidental load for a day, a week, a month, or a generators on the generator. year refers to the sum of load at the peak of Actual capacity or actual power (registered consumption in regions in megawatt. Where the power): refers to the maximum amount of interconnected system does not cover the total electricity that could be generated by a generator country, the maximum coincidental load may be while regarding the environmental conditions calculated by adding up maximum load of (altitude, temperature, and relative moisture). interconnected network and load of separate Maximum coincidental power generated: refers regions in megawatt simultaneously. With regard to the sum of electric power generated at the peak to the difference between peak hours of of network load during a certain period. The sum consumption in different regions connected to the of maximum coincidental power generated might interconnected network, maximum coincidental be equal or less than the total capacity of the load is less than the sum of the maximum loads of the plants. regions. Gross generation: refers to the amount of Maximum non-coincidental load: the sum of the electricity generated by a generator or a plant peak of consumption in different regions of the during a certain period which is measured on country during a certain period, which are not output series of the main or supplementary necessarily simultaneous. generators and stated in kilowatt hour (kWh) or Power Company: the companies (Ltd.) which are megawatt hour (MWh). by law engaged in generation, transmission and Net generation: refers to the electricity measured distribution of electricity or in a part of such at the point of transmission to the power grid. activities and provide the customers with During a certain period, the net generation may be electricity. The definition covers the water and calculated by subtracting the gross internal power organizations as well. consumption form the gross generation in the Power plant: refers to the installation place of same period. generators and related equipment. Other institutions: the institutions which generate Hydroelectric power plant: a power plant in electricity for their own consumption and also sell which the potential energy of water accumulated a part of their production to other institutions but at dams or flowing energy of rivers water is used are independent from the Ministry of Energy; to drive the hydroelectric turbine for electricity some examples are, Esfahan Steelworks, generation. Mobarakeh Steel Industries, Petrochemical Thermal power plant: a power plant in which Industries, Tabriz Tractor Industries, and chemical energy inherent in solid, liquid, gaseous Sarcheshmeh Copper Industries. fuels is transformed into electricity. This 374 IRAN STATISTICAL YEARBOOK 1395 9. WATER AND ELECTRICITY definition covers nuclear, steam, gas, combined- equipment used for transmission of high amount cycle and diesel power plants. of electricity, with high voltages in long distances Steam power plant: a kind of power plant in between source points (power plants and receiving which thermal energy produced from liquid, solid points. and gas fuels is used for steam production and Sub-transmission line: a collection of then driving the steam turbine to generate transmission lines with voltages from 63 to 132 electricity. kV. Gas power plant: a type of power plant in which Electricity customers: natural or legal persons hot gas produced from the thermal energy in gas whose specifications are registered by customers and liquid fuels drives gas turbine to generate division according to the regulation of the power electricity. company after submitting the required documents Combined-cycle power plant: a kind of power and payment of the related costs, and are offered a plant in which, in addition to electric energy in customer number. gas turbine, the heat in gases off the gas turbine is Household uses: electricity used by households to used for production of steam using a recycling operate common electric appliances and for lights steam kettle. The steam produced is transformed in residential units. into electric energy in a steam turbo generator set. Public uses: electricity used for public services. Diesel power plant: a kind