Following a rainstorm Wednesday, several high voltage power lines were damaged in the central, Sharon and Krayot regions.
About 15,000 homes are disconnected from electricity. Israel Electric Company (IEC) teams are working in emergency mode to restore power.
Intermittent rain and thundershowers are expected throughout Israel, from the northern region to the Negev, and there is concern about possible flooding in the riverbeds of the south and east.
The power outages took place a short while after the Israel Electric Company (IEC) reported Wednesday morning that power had been restored to all but a few customers, a full three days after the flash storm that hit central Israel Sunday morning knocked out large parts of the electrical grid.
The unusually harsh weather, in Israeli terms, included rain, large-sized hail and winds of up to 100 kph (62 mph), which caused trees, cranes, billboards and electrical poles to fall, and disconnected power cables.
Most of the outages were in the Sharon area northeast of Tel Aviv, including Raanana, Kfar Sava, Herzliya, Netanya and surrounding communities. About 200,000 homes were without power at the peak of the storm.
The mayors of relatively affluent Raanana and Herzliya sent a letter to Prime Minister Binyamin Netanyahu Tuesday and demanded that a governmental committee of investigation be set up to study the causes of the emergency.
"The tens of thousands of residents who have been knocking on our doors in distress, and we along with them, have lost faith in the Electric Company," they wrote.