Osterman Propane has provided energy, comfort, and confidence to our customers for over 50 years. Serving residential, commer ... cial and industrial users in Massachusetts, Connecticut, Rhode Island, New Hampshire and Vermont, Osterman Propane has the experience and capability to meet your every need. Still operated by three generations of the Osterman family, we have small business values to provide you with prompt and personalized customer service, while still having the size and capability of a large company to meet every need. read more