Guangzhou, Guangdong province, has built the country's largest "self-healing" electricity distribution grid using 6,242 public feeders in the power distribution network.

A statement released on Friday by Guangzhou's electrical supply bureau said that the city has become the first in China to achieve self-healing and full coverage after three years of effort.

Self-healing means that any electrical faults are corrected automatically and quickly.

"The fault processing time on the electrical grid has been reduced from 30 minutes to 120 seconds, which greatly improves reliability," the statement said.

Guangzhou, a core city in the Guangdong-Hong Kong-Macao Greater Bay Area, has high requirements for power reliability and bears great responsibility to ensure that supplies are uninterrupted insofar as possible.

A super large urban power supply network, the Guangzhou power grid now serves more than 7,000 square kilometers, the statement said.

To improve the capacity and quality of the city's electrical power grid, the bureau began a series of upgrades three years ago, investing to build the self-healing function and improve the power restoration level of its distribution network.

The number of households with medium-voltage power failure was reduced by about 21,000 events, in the first 10 months of this year, about 37 percent of the total number of households with power failure recorded in all of last year.

The city's electricity grid successfully self-recovered 411 times from January to October, retrieving a total of 976,529 megawatts of load loss and restoring 5,999 distribution transformers, benefiting a total of 521,800 medium- and low-voltage electrical users in the southern metropolis, the statement said.