Cambridge Police say there won't be anything to be alarmed about on Saturday when you see large clouds of steam erupting out of the Veolia power plant in Kendall Square on Saturday.
Veolia Energy will be conducting a procedure known as steam blowing Saturday, May 30, between 8:00am-6:00pm. ... This operation involves flowing steam through a pipe for the purpose of pipe cleaning. The cleaning will result in large clouds of steam, which may cause curiosity and/or phone calls from the general public.