The closure means the Palestinian enclave will suffer even more power outages, Gaza Energy Authority spokesman Ahmed Abul-Amreen said in a statement.
The power plant resumed operations in mid-December following seven weeks of closure due to shortages of the fuel needed to operate it. The plant's operations only resumed following receipt of a Qatar-funded fuel shipment.
The plant requires some 650,000 liters of diesel fuel for its daily operations.
On Tuesday, following the death of an Israeli man near the border with Gaza, Israel ordered the closure of Karam Abu Salem.
Electricity outages in Gaza typically last for eight hours each day, but a fuel shortage has aggravated the situation, causing daily power outages of up to 12 hours or more.
The 65-megawatt power plant only supplies about one third of Gaza's total electricity needs.
Gaza receives 120 megawatts of electricity from Israel each day and buys a further 28 megawatts from Egypt, according to the Gaza Energy Authority.
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