It was once a source of national pride -- an award-winning firm that powered South Africa's mining boom and later brought electricity to black communities left behind by apartheid.
Today, a hundred years after its birth, Eskom has experienced a spectacular fall from grace.
South Africa's energy giant is crippled by debt, beset by corruption scandals and unable to keep the lights on.
Families and businesses are exasperated by the record power cuts imposed by the utility, which provides about 90 percent of the country's electricity.
"To South Africans today, (Eskom) represents a source of enormous frustration and ridicule," said Kyle Cowan, author of "Sabotage," a book detailing Eskom's troubles.
A tweet Wednesday to mark the corporation's centenary summed up the bitter mood.
"We hope you enjoy the cake we made for you," it said, accompanied by a picture of a bowl of raw cake batter -- uncooked because of the blackouts.
Eskom prides itself on its long history, which is closely intertwined with that of modern South Africa.
Its website reminds readers how "the good townspeople of Kimberley," a diamond mining hotspot, were in 1882 among the first in the world to get electric street lights -- even managing "to beat London to it".
Eskom was set up on March 1 1923 as the Electricity Supply Commission (ESCOM), tasked with boosting industry and mining activities.
Gold had been found where Johannesburg would sprung up, and mines required a lot of power to run.
- Coal rush -
Coal-fired stations started popping up across the country and grew bigger and more plentiful through the decades.
Yet there was a catch.
All this largely benefited white people, with black South Africans segregated and disregarded by the apartheid government.
In 1987 only 40 percent of the population had access to electricity.
The first democratic elections in 1994 were followed by a push to electrify millions of homes, and keep electricity prices low.
The mammoth effort even won Eskom an award in 2001.
But it was not backed by additional capacity, something that laid the foundations for today's troubles, Cowan said.
"Eskom has basically been mismanaged into the ground," said Cowan.
Finance Minister Enoch Godongwana admitted Eskom's woes, highlighting to AFP "the debt situation, which is making it difficult to move with speed, in particular upgrading their plants."
In 1998, a government paper warned the country risked running out of electricity within a decade unless new plants were built.
But the advice was left unheeded until the last minute, something ex-president Thabo Mbeki would later apologise for.
- 'Cyanide' -
Eskom began building two new coal-powered stations only in 2007, the year power cuts were first imposed.
But the new plants suffered from commissioning delays, design and construction problems, massive cost overruns and allegations of graft.
Under Jacob Zuma's presidency, Eskom found itself at the centre of a massive corruption scandal.
Millions of dollars were allegedly syphoned off through fraudulent contracts in return for bribes.
Last year, an ex-CEO was arrested for money laundering and fraud.
In February, the firm's outgoing chief Andre de Ruyter compared corruption at Eskom to a cancer that had "metastasised" and "grown throughout the entire body of the organisation."
In one egregious case, the company had been paying 80,000-rand ($4,300) a piece for knee guards sold in retail stores at $16, he said.
Attempts to clean up the firm faced fierce internal resistance, he told local broadcaster eNCA, adding he suffered a poisoning attempt in December, drinking coffee laced with cyanide.
Hours after the interview, in which he accused the ruling ANC party of being involved in the wrongdoing, he was asked to leave his post prematurely.
Eskom has had more than a dozen CEOs in the past 15 years.
"Corruption is not the reason why the energy crisis started, but it's a big reason why it is still not solved," said Roula Inglesi-Lotz, a University of Pretoria economics professor.
A licensing threshold for private power generation projects was removed only last year.
Trade unions have pushed back against plans to boost private investment in green energy and break up the monopoly into separate divisions for generation, transmission and distribution.
Eskom employs over 30,000 workers.
President Cyril Ramaphosa recently announced a national state of disaster in a bid to tackle the energy crisis.
Many South Africans who hope this could help bring some relief, might be in for a disappointment.
"There are no quick fixes," said Inglesi-Lotz.
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© Agence France-Presse
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