Hydroelectric power plants require less start-up time and take a load in a very short time compared to thermal power plants which take several times to prepare the boilers, the superheater and the turbine system. to take the load. Hydroelectric plants have the capacity to handle rapidly changing loads, but thermal plants respond slowly. For this reason, it is preferable for hydroelectric power plants to operate in peak load plants and thermal power plants as base load plants. In order to use energy efficiently, the cost must be as low as possible. Thus, the main objective of power system operation is to generate and transmit power to meet the system load demand with minimum fuel cost and minimum environmental pollution. Say no to plagiarism. Get a tailor-made essay on “Why Violent Video Games Should Not Be Banned”? Get an original essay Therefore, hydrothermal programming is necessary. The objective of optimal hydrothermal planning is to minimize the fuel cost of thermal power plants under constraints of water availability for hydroelectric power plants over a given period of time. Long-term coordination extends from a week to a year or several years. This is used to minimize the cost of the entire system in the long term. The long-term coordination problem becomes very difficult to solve due to its size, its duration (several years) and the random nature of water supplies over a long period. Short-term planning is necessary for a day or a week. In the short-term problem, the water level is assumed to be constant because there will be no appreciable change in the water level in the reservoirs. So this problem is quite easy to solve due to its size and duration (one week). ). Short-term planning is required for a day or a week, involving hour-by-hour planning of hydroelectric and thermal power plants to achieve minimum production cost for the given period. In this planning problem, the load, hydraulic flows and availability of the unit are assumed to be known. Additionally, the production unit limits and load demand over the planning interval are known. In the short-term problem, the water level is assumed to be constant since there will be no appreciable change in the water level in the reservoirs. Several mathematical optimization techniques have been used to solve short-term hydrothermal planning problems [4]. Load cycle, expected water inflow, water height and production in a hydroelectric plant, additional fuel cost of a thermal plant and additional transmission loss are the various factors on which the operation depends economics of hydrothermal planning. The different methods used for hydrothermal planning are constant hydro generation method, constant thermal generation method, maximum hydro efficiency method and Kirchmayer method. A large number of researchers have extensively studied the problem of short-term hydropower scheduling. The main calculation techniques used are maximum principal calculation, variational calculation, dynamic programming and non-linear programming. In this article, Kirchmayer's method for short-term planning is presented. The proposed method is one of the effective methods to solve the scheduling problem.