HARTFORD, Conn. — Tempers are flaring six days into an epic power outage that has roughly 300,000 Connecticut customers in the dark after a Northeast snowstorm.

Residents have been lashing out at the state’s largest utility for taking so long to restore electricity after snow-laden branches brought down wires across the region last weekend. Connecticut Light & Power urges angry customers to stop threatening and harassing repair crews.

National Guard troops deployed to clear debris are providing security outside a utility office building in Simsbury, a hard-hit Hartford suburb.

Central Maine Power is sending 30 two-person repair crews and bucket trucks to help Connecticut Light & Power restore service.

CMP completed its own power restoration efforts in Maine by Tuesday afternoon. Hours later, CMP dispatched two dozen crews to help in New Hampshire, and another six crews joined them today. After finishing up there, the crews continued southward to Connecticut.

CMP President Sara Burns says other companies around New England and Canada have come to Maine’s aid, and she says CMP is happy to return the favor.

At a shelter at Simsbury High School, Stacy Niezabitowski said today she would love to yell at someone from Connecticut Light & Power but hasn’t seen any of its workers.

The utility promises to restore power to 99 percent of its 1.2 million customers by Sunday night.