About Us / References



en2-Consulting is an engineering office with more than 20 years of experience in the energy industry – particularly in the areas of environmental and resource management, energy generation and supply.

The founder of en2-Consulting – Robert Pfeifer – is registered auditor for energy audits (registered at the Austrian federal ministry of for science, research and economy)  and also co-founder and vice president of VIENNA ENGINEERS; an Austrian association of engineering offices.




Selected References

Our client reference list includes not only international industrial players but also local businesses and property / facility management companies including:

  • TÜV Austria GmbH
  • Energo Rijeka (HR), (consortium: Vienna Engineers)
  • Millennium City (consortium: Bluesave)
  • TPA Energie- und Umwelttechnik
  • MCE Stangl, Frankfurt (D)
  • OMV AG
  • Triumph International AG
  • Quester Baustoffhandel GmbH (consortium: Vienna Engineers)
  • Kinderfreunde Österreich
  • ÖJAB (consortium: Vienna Engineers)
  • Unicredit (Bank Austria)
  • Donath Immobilienverwaltung GmbH
  • Frigo Immobilien GmbH
  • Georeal Immobilien GmbH
  • Architekt DI Angst
  • Hausverwaltung Handschur
  • Semperit AG
  • GE Jenbacher (Jenbacher Energie)
  • Verbund
  • EVA Immobilien
  • and many others …


The following is a selection of the industries and specialist areas in which we have provided our services:

  • Steel processing industry (Optimising the electrical power supply and assessing and
    …re-dimensioning the pressurised air supply system)
  • Brickyards (CHP planning and heat recovery)
  • Glass production (Rotary speed-regulated drives and lighting)
  • Plastics production (Gas supply and heat recovery)
  • Chemical industry (In-house power production and emergency supply based on CHP
  • Expert opinions for existing gas and steam-fired power plants
  • Thermal renovation of office buildings and production facilities
  • Renewal of boiler plants and heat recovery
  • Landfill sites, sewage works and gas from fermentation processes
    …Electricity and heat production based on biogas-fired CHP plants
  • Plant contracting for energy production plants
  • Energy performance certificates and thermal renovation of residential buildings (retrofit).