Hydro power plants
All hydro power plants were issued certificates of electricity production from renewable sources, which places HEP Proizvodnja among large certified producers of renewable energy in Europe (better known in the public under the name "green energy") which is becoming increasingly important in the market.
In June 2006, the production area Hydro North, with the seat in Varaždin, received the certificate ISO 14001 for environmental management and certificate ISO 9001 for quality management, while at the end of November 2006 the certification procedure for obtaining ISO 14001 for environmental management system and certificate ISO 9001 for quality management was successfully completed for all three hydro power plants (Ozalj, Gojak, Vinodol, Rijeka, Senj).
Thermal power plants
All parts of HEP Proizvodnja take all prescribed measures for control of environmental impact. At the same time, measures are taken and investments are made to reduce all environmental impacts - from thermal power plants' emissions through noise control to management of all sorts of waste.
The largest thermal power plant in Croatia, TE-TO Zagreb CHP, received the internationally recognized certificate ISO 14001:2004 in February 2006, confirming that the established environmental management system complies fully with all requirements of the standard, with the adopted environmental policy and with all legal and other requirements applicable to TE-TO Zagreb CHP.
In 2007 KTE Jertovec and EL-TO Zagreb were awarded ISO 9001 and 14001 Certificates (Bureau Veritas Certification House).
In all thermal power plants, emissions of all flue gases are continually measured. In addition, in several locations in Zagreb and Plomin, special measuring stations continually monitor and control emission environmental impact (imissions). The results of all measurements indicate that the level of emissions from thermal power plants is within permissible values. The fact is that outside Plomin thermal power plants - thanks to the installation of the latest technology of desulfurization and flue gas filtering coupled with the use of quality coal - one cannot tell whether plants are in operation, because emission and imissions from both Plomin units are well below limit values.
The RETZOK Project includes special monitoring of all environmental investments in accordance with EU directives with each invoice related to environmental investments being separately monitored.
Cleaner Generation Project
In line with the Athens Energy Community Treaty, adopted by the Republic of Croatia among others, in constant attempt to improve energy efficiency of power and heat generation in all generating plants of HEP Proizvodnja d.o.o. and to expand the use of renewable energy sources - technological solutions and procedures that may contribute to cleaner generation of energy are continuously being considered and implemented according to a specific schedule and priorities. HEP Proizvodnja d.o.o. has been making efforts to comply with Chapter III of the Athens Treaty by taking measures to limit air emissions from large thermal power plants and with Chapter V which encourages production from renewable energy sources which include hydro power plants.