John Duffy Energy Services

Since 1891, John Duffy Energy Services has been providing world-class residential and commercial services to customers throughout Newark and the northern and central parts of New Jersey. Our industry has changed a lot over the years, but while coal has been replaced with oil and gas and fleet fueling technology continues to advance, our core values remain unchanged. John Duffy Energy Services is dedicated to providing customers with the best value possible. That means peerless standards of service, the utmost in professionalism, and a devotion to preventative and diagnostic procedures that will save you money. Above all, we want to provide you with energy and fueling services you can rely on without worry-period.