South Africa's power shortage worsened on Friday as large parts of the country were gripped by loadshedding.

Stage 2 rotational loadshedding was implemented from 09:00 a.m. and was likely to continue until 22:00 p.m. as a result of loss of additional power generation units overnight, said electricity utility Eskom, which provides more than 95 percent of the electricity consumed in the country.

Stage 2 calls for 2,000 MW to be rotationally loadshed nationally at a given period. This was the most serious load shedding this year. Previously, Stage 1 load shedding, which allows for up to 1,000 MW of the national load to be shed once a day, had been implemented several times.

If the situation worsens, Stage 3, which allows up to 4,000 MW to be shed, will be implemented.

Load shedding is implemented rotationally as a last resort to protect the power system from a total collapse, Eskom said.

"We continue to appeal to residents and businesses to use electricity sparingly during this period. Please switch off geysers as well as all non-essential lighting and electricity appliances to assist in reducing demand," the state-run parastatal said.

The generation and distribution of electricity in the country has been constrained because Eskom is running short of coal, which the utility relies on to generate power stations, raising fears that similar loadshedding is on the way as in 2014 and 2015 when frequent loadshedding gripped the country.

Since 2008, South Africa has suffered from power insufficiency which has led to economic losses of an estimated 300 billion rand (about 23 billion U.S. dollars).