According to Oilprice.com the reality is that Khartoum’s revenues have dropped dramatically since the departure of South Sudan and president al-Bashir’s government is now strapped for funds. After South Sudan seceded in July 2011, it took with it 75% of the Sudan’s known oil wealth, severely depleting Khartoum’s treasury.
Sudan and South Sudan have wrangled over transit fees ever since, but in the interim, bills have to be paid, which is why the electricity tariff increases were floated.