National Grid could be facing more than $16 million in fines connected to its response to two major power outages last year.
Police are searching for a man who took an axe to a tree clearing machine, causing $5,000 in damages.
As many as 58 of the new trees on the Boston-Newton line were planted directly underneath four layers of utility lines which include NStar electrical power cables.
NStar has put a temporary stop to tree clearing work in Sudbury, Wayland and Framingham.
Negotiations continued Thursday between NSTAR and the Utility Workers of America Local 369.
The lights are back on in the Back Bay, but Mayor Tom Menino is still unhappy with NStar.
A power outage affected parts of Boston’s Back Bay for a short time on Tuesday afternoon.
Following 18 months of federal and state review, Northeast Utilities closed Tuesday on its $5 billion purchase of NStar, creating the biggest utility in New England.
The Massachusetts Department of Public Utilities OK’d the purchase of NStar two days after approval by Connecticut regulators.
NStar says it’s not liable for losses from the Back Bay power outage, but some local attorneys say that may be wishful thinking.