Officials had said Israel would allow the resumption of diesel deliveries into Gaza today, a day after the Palestinian territory's power plant stopped working because of a lack of fuel.
"The central power station will resume operations at 06:00 am (0400 GMT)" tomorrow, Fathi al-Sheikh Khalil told AFP.
"We were expecting the delivery today of 500,000 litres of fuel, but the delivery has been delayed, and only 100,000 litres have been delivered," he said.
A Palestinian official, speaking to AFP on condition of anonymity, said: "Problems in transferring funds between the Palestinian Authority in Ramallah and the Hamas government in Gaza are to blame" for the delay.
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A spokesman for COGAT, the Israeli defence ministry unit responsible for crossings into Gaza, confirmed that 100,000 litres of fuel were delivered today via the Kerem Shalom crossing for the power station.
COGAT had earlier confirmed that the fuel deliveries were to resume today.
On Thursday, the defence ministry shut down the Kerem Shalom crossing into southern Gaza after militants there fired scores of rockets over the border, although no one was injured.
"Defence Minister Moshe Yaalon... Instructed to open the Kerem Shalom crossing for the transition of gas into the Gaza Strip," COGAT said earlier today.
"The amount coordinated for today... Is 500,000 litres of diesel and gasoline for the private sector, 160,000 tonnes of cooking gas, and 200,000 litres of diesel for the operation of the power plant in Gaza," it said.
The power plant, which supplies some 30 per cent of Gaza's electricity needs, fell silent for 50 days in the latter part of 2013 because of lack of fuel but resumed operations in late December.