The National Landlords Association (NLA) has added E.ON UK to its list of recognised suppliers.
Landlords can now benefit from customer service advice from the supplier, as well as reasonably priced rates.
Head of marketing at NLA Paul Berwick said: "More and more companies [are] realising that landlords are a key market for energy companies."
Reasonable prices and the assurance that energy provided is as green as possible can also now be expected, he added.
Empty properties, which are in the landlord's name, will see the removal of standing chargers by the supplier, it was added.
Landlords may also pay a monthly fee, which ensures that in the event of a breakdown of heating of hot water systems, there will be no "expensive surprises".
E.ON's online service provides landlord packs where property owners can look at ways of making houses more energy efficient.
In December 2009, the NLA added Sky to its recognised suppliers list to help landlords through the digital switchover, it was announced.
Written by John Weeks
