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RESITA HYDRO PROJECT CEZ GROUP

ROMANIAN HYDRO POWER SUMMIT 2014

20 February 2014

Project location and main parameters of Resita hydro system – refurbishment and modernization of 4 old hydro power plants

Location: Romania, west part of country, Banat Region, Caras Severin county

Semenic channel max 2,34mc/s TTA pumps (2x0,3mc/s)

Synoptic scheme of Resita water system 1012m a.s.l.

Semenic water chamber, HWL=996m a.s.l

Safra water chamber, HWL=863m a.s.l

Timis Trei Ape pumping station, 834m a.s.l.

Safra channel

 Satu Mare  Baia Mare  Sucea va  Botos ani  Ar ad  Timiso ara  Orad ea

Resita

  au De va Zal  Cluj Napoca  Alba lulia  Sib iu   Bistri ta Tîrgu Mures  Piatra Neamt  Miercur ea Ciuc  he Sfîntu Gheorg  Bras ov  Bacau  Focs ani  Ia si  Vaslui  Gal ati  Bra ila  Tîrgu Jiu  Turnu Severi n Drobe ta  Craio va  Rîmni cu Vîlcea  Slati na  Pite sti  ria  Tirgovi ste Alexand  Ploie sti  Buz au  Slobo zia  Giur giu  Bucures ti  Calar asi  Tulc ea  Consta nta Semenic river

Timis Trei Ape lake 4,4mio mc

Timis river Hbr=474m Hbr=342m

Barzava river

Main channel Rankina water chamber, HWL=464 m a.s.l.

Water pipes for Resita municipality Breazova water chamber, 514m a.s.l.

Superior channel Hbr=37m

HPP Breazova, Hbr=37m, 477m a.s.l.

Pi=0,656MW, E=1,84GWh

Gozna dam&lake (597m a.s.l.) 10,3 mio. mc

Hbr=75m

HPP Crainicel 1, TWL=521m a.s.l.

Pi=4,16MW, E-8,33GWh/year HPP Crainicel 2, TWL=521m a.s.l. 521m a.s.l.

Pi=9,2MW, E=23,18GWh/year

Valiug dam &lake 0,9 mio. mc

Birzava river Grebla pumping station

Secu dam & lake, 300m a.s.l.

7,96mio. mc Grebla HHP, Hbr=215m, 249 m a.s.l.

Pi=7,968MW, E=2854GWh/year

Refurbishment of old hydro system – main data for old technology

     Resita project started with achievement from TMK Resita (steel factory), in 2010, of existing old hydro energetic system, in operation, located on the west part of Romania, on Semenic Mountains. The hydro system included mainly:  4 hydropower plants (Grebla, Crainicel1, Crainicel 2 and Breazova);   1 pumping station (Timis Trei Ape); 4 dams/lakes: Gozna (10,27 millions mc), Secu   (7,96 millions mc), Valiug (0,92million mc), Timis Trei Ape (4,4 millions mc); 64km of channels, 12 tunnels and 4 main metallic aqueducts; 32km of electrical networks 6kV and 35kV, 5 transformer stations MV/MV or MV/LV.

The energy generated in old HPPs it was used by steel factory using medium voltage network and substations; The technology used in HPPs it was very old, the commissioning was as follows: HPP Grebla Crainicel 1 – 1970, HPP – 1956, HPP Crainicel 2 – 1997, HPP Breazova – 1950.

Old system included historical monuments, most important are the buildings(power houses) for HPP Grebla and HPP Breazova.

Total maximum power produced by the old equipment was around 18MW.

HPP Grebla – old transformer station 6/35kV HPP Grebla – old equipment on machines room

Refurbishment of old hydro system – images with old technology HPP Breazova – Power house (historical monument) HPP Crainicel 1 – Old machines room HPP Breazova – oldest Francis turbine, manufactured by GANZ in 1916 HPP Crainicel 2 – Old machines room

Needed for refurbishment of small hydro power plants were coming as a result of the high degree of wear and tear of initial old equipment and risk for negative potential environmental impact.

HPP Crainicel 2 – Works for foundation of new turbine, generator and anchor blocks HPP Crainicel 1 – Reinforcement steel and concrete pouring for foundation of new turbine and generator HPP Breazova – Reinforcement steel and concrete pouring for foundation of new turbine and generator PS TTA – Desassembly of old technology

Resita project – reconstruction in images

 Refurbishment project was complex and was divided into eight major sections : HPP Grebla , HPP Crăinicel I, HPP Crăinicel II, HPP Breazova , Water channels, Pumping Station Timis Three Waters (TTA) , Transformer station 6/35/110 Grebla and OHL 35 kV OHL from hydro system and last one Connection to the national electrical distribution network 110 kV.

 In May 2011 started the refurbishment project of old existing assets technology from Resita hydro system, which consist mainly in design and execution of the replacement of existing equipment with new ones, repairs of channels, aqueducts, electrical networks 35kV and new connection to the national electrical system, including main transformer station. The design and permitting stages were developed in 2011-2012 in parallel with the operation of old HPPs.

 The hydropower plants were in operation till end of July 2012, when started the execution works, in parallel for sections HPPs, PS Timis Trei Ape and Channels. Electrical execution works started in March 2013.

Grebla transformer station 6/35/110kV – Foundations reinforcement steel HPP Grebla – Installing of new technology

Refurbishment – refurbishment in images

 The refurbishment works are made base on fully yellow turn-key contract, signed by CEZ Romania with Hydropol;  The main stages of this project were: Disassembly of old machines; Carrying out construction works necessary for assembly of new equipment; Installation of new equipment; Testing and commissioning of new equipment.

 Effectively execution of the work began in July 2012 based on Building Permits obtained, by disassembling old machinery. Complex tests started in October 2013 and first coupling of new generators were in November 2013. All new generators were ready for continuous operation in first part of December 2013, as it was planned.

HPP Grebla – Penstocks and anchors blocks refurbishment HPP Grebla – Dispatcher control room

Refurbishment of Resita hydro system – new technology in operation

 The new equipment installed in the 4 small HHPs (Grebla, Crainicel I, Cranicel II and Breazova) meet high performance criteria and include turbines, generators and transformers, GIS module, electric cells and automation panels, automated equipment for water cleaning and were produced by companies with experience in domain from countries like Germany, Italy and Norway.

 The general contractor of the work collaborated with Romanian companies throughout the project, supporting local economic development environment. Also, one of the major advantages of refurbishment for the community is the direct link to the National Energy System for Brebu Nou and Garana villages and reserve supply for the area Valiug - Semenic Mountain.

 Following the commissioning of new equipment, total installed power in the 4 hydro power plants increased from 18 to 22MW and confirmed increased efficiency of production of hydro power (about 20%), and an improved level of environmental protection.

 Al hydro system is leaded on SCADA from Grebla dispatching (control) room and from Craiova DED 110kV for local electrical grid.

 End of refurbishment and modernization works was registered in December 2013 and fully commercial operation in January 2014

Grebla transformer station 6/35/110kV – connection with SEN HPP Grebla – Works finished

Refurbishment of Resita hydro system – new equipment ready for operation HPP Crainicel 2 – New technology installed HPP Crainicel 1 – Final stage of refurbishment HPP Breazova – New turbine and generator installed Channels – New steel gates installed and channel refurbished

BACK - UP

Refurbishment of Resita hydro system – technical parameters of HPPs Unit

HPP Grebla – G1 HPP Grebla –G2

HPP Grebla

HPP Crainicel 1 – Gozna head (2 units) HPP Crainicel 1 Safra head

HPP Crainicel 1 HPP Crainicel 2 Discharge (mc/s) Design Head (m) Turbine type

1,5 3

4,5

2 0,8

4,8 2,43

209,7 209,4

67,8 236,3

451 Francis horizontal Francis horizontal

Francis horizontal, 2 units Pelton vertical, 6 jets

Pelton vertical, 6 jets

Rotation (RPM)

1000 750 750 1000 750

Breazova – Francis TOTAL HPPs units 2,24 -

34,6

Francis horizontal

600

Generator type

Synchronous, 6kV Synchronous, 6kV

Generator active power (kW)

2640 5328

7968

1280 1600

4160 9200 656 21.984

Estimated yearly net energy generated (GWh)*

9,45 19,09

28,54

5,29 3,04

8,33 23,18 1,84 61,88

*) Source: Hydropol CZ, General Contractor 11