Human use of energy, more often than not directly use the energy itself (except as industrial raw materials), but by the energy directly or through conversion and energy. The energy itself also can convert each other, form we need form. For example, fossil fuel burning through changing the chemical energy into heat energy, and then through the steam turbine special heat energy into mechanical energy, and then through the generator for converting mechanical energy into electrical energy, and so on. Figure 1 - 2 - 4 expressed various energy (energy) conversion and utilization

In addition to transformation on the conversion of energy and space., on the conveyor. Energy is transported by the transporting energy carrier -- energy. Transportation such as oil through train, ship, oil pipeline. The conversion of chemical energy in the space position. Coal, natural gas is also so. Electric energy is through the transmission line to realize power space conversion at
In addition, storage, conversion, energy and time is. For example, fossil fuels will be some years ago the solar energy stored, for we humans today to exploit. The most difficult is to store electrical energy. Especially in China, the electricity energy mostly from thermal power, and people use electricity has high bee and trough, during the day to use electric power, low electricity consumption at night, if meet the daytime demand, night electricity is not, it will result in thermal power plant, less power cochlear pressure of furnace fire, it will greatly reduce the efficiency of power generation, waste energy.
R, the world energy storage method is mainly lead battery using improved (500Mwh), a new battery (500Mwh), flywheels, compressed air and pumped storage power station. With the flywheel storage, which can drive a motor to rotate the flywheel with huge excess electricity in low power, electric energy into mechanical energy, peak electricity to convert mechanical energy into electrical energy by a generator, is a capable of storing electric energy 1000Mwh. using compressed air energy storage, namely the use of abandoned mine, the import and export blocked, in low power, start the air compressor, the compressed air to the mine, well, electric energy can be converted into energy, peak electricity, then the music of compressed air to promote gas turbine power generation, the potential energy is converted into electric energy, one can store electrical energy 1000Mwh. capacity is the largest pumped-storage power station, namely the construction of two with a certain height difference of the water reservoir, low power electric drive the pumps will be low level of reservoir water is pumped to the high water level of the reservoir to the electricity, high bee again when the high water level of reservoir water through the hydraulic generator is stored in the reservoir after low level, so go round and begin again, to store electrical energy. This purpose The efficiency of the system for pumped storage power station is a 75% class 6, its storage capacity can be greatly. China is currently or plan to build large pumped storage power station in Beijing, Zhejiang and other places.