First, its own. Some electrical unit without power supply, such as the outlying islands and in remote pastoral areas, rural, camp, station, station on the desert plateau, you need to configure your own. The so-called own, is the spontaneous use of power, in the case of power are not too big, diesel generators are often self-powered preferred.
Second, the standby power supply. Main uses is some electricity units although has has compared sound reliable of network electric supply, but to prevent accident situation, as appeared circuit fault or occurred temporary blackout like, still can configuration as emergency power using, using power of electricity units General on power guarantees of requirements compared high, even 1 points one seconds of blackout are not was allows, must in network electric terminated power of moments on with since emergency prepared power to replacement, or on will caused district big loss. This class units including some traditional of high power guarantees units, as hospital, and mine, and power plant security power, makes electricity heating equipment of factory,; in recent years, network power especially became alternate power needs of new growth, as telecommunications operators, and Bank, and airport, and command center, and database, and highway, and high grade Hotel Office, and senior catering entertainment,, due to using network management, these units are increasingly became alternate power using of subject.
Third, alternative power. Alternative power supply's role is to make up for the deficiencies of network electricity supply. This can have two, one is the high price of electricity network, from the point of view of cost savings, select diesel generators as an alternative power source; another is in the case of net electricity is in short supply, net electricity use is limited, the Department forced rolling blackouts when electric units for the normal production and work, you need to replace the power to remedy. China diesel generator products market selling prices several times in recent years, such as 80 during the first half of the national best seller, hot early 90 's South China 2003-2004 sales in East China, is caused by national and regional power shortages, to cope with the large-scale power rationing, buying diesel generator power for alternative power.