Renewable energy
- Solar: DRV - Regional Waterworks in Transdanubia Plc.; TRV - Regional Waterworks in Transtisza Plc.; ÉRV - Regional Waterworks in Northern Hungary Plc.; DMRV - Regional Waterworks Way Along the River Danube Plc.; ÉDV - Regional Waterworks in Northern Transdanubia Plc.
- Geothermal: MIHŐ Kft. - District heating company of Miskolc
- Biomass: FŐTÁV Zrt. - District heating company of Budapest VKSZ Zrt. - Local Utility Management Company of Veszprém
- Biogas: Biogas Miskolc Ltd.; DRV - Regional Waterworks in Transdanubia Plc.; TRV - Regional Waterworks in Transtisza Plc.; ÉRV - Regional Waterworks in Northern Hungary Plc.; DMRV - Regional Waterworks Way Along the River Danube Plc.; ÉDV - Regional Waterworks in Northern Transdanubia Plc.
Energy efficiency
- Budapest City (Capital) Government Office
- MMA - Hungarian Academy of Art (Art Gallery (Műcsarnok) of Budapest),
- Pest County, Hungary
- Budapest XI. District (Újbuda)
- BGYH Zrt. - Budapest Healing Baths and Hot Springs Co. Plc.
- FKF Zrt. - Management and Maintenance of Public places of Budapest
Energy Consultancy
- Wanhua International - BorsodChem Plc.
District Heating
- Cities of Szentendre and Budakeszi in Hungary
Environmental Consultancy / Waste management / Waste to energy
- NHKV Zrt. - National Coordination of Waste Management and Asset Management Plc.
- OKTVF - National Inspectorate of Environment and Nature
- Budapest XI. District (Újbuda)
- Humansoft Information Technology Ltd.
- AVE Miskolc Kft. – AVE Waste Management Company of Miskolc Ltd. Role of Green Player Ltd
EU expertise and advice / Climate policy
- RFH Zrt. - Regional Development Holding Plc
- OT Industries Plc. (now member of MOL Group)
- NÉBIH - National Food Chain Safety Office
- Budapest Waterworks Plc.
- Consortium formed by Budapest XI. District and Pest County (EE MLEI-PDA)
- MAVIR Hungarian Independent Transmission Operator Company Ltd.
- KOM Central Smart Metering Ltd. - MAVIR Hungarian Independent Transmission Operator Company Ltd.
- Miskolc Holding Local Government Asset Management Corporation