The Green Deal registered provider, which also offers customers renewable monitoring solutions, says the accolade follows a 12 month period where revenue grew 257 percent.
After growing revenue from £21million to £55.1million in the last financial year and expanding its team by a quarter, the company expects to exceed its target of £100million by financial year end March 2014.
Adrian Pike, ceo of Anesco, said: “What an amazing Christmas present! To be ranked number one is just unbelievable.
“2013 has been an absolutely phenomenal year for Anesco. We’ve achieved so much and that’s down to the team we’ve pulled together and all their hard work. People are at the heart of what we do and that’s why we’re so proud of our Investors in People gold standard. We wouldn’t be where we are today without their dedication.”
Anesco also reports that its renewable assets maintenance service, AnescoMeter, is monitoring over 11,000 UK solar installations, which to date have achieved a total carbon saving of over 37,000.