When analyzing the trend of renewable energy sources, we are usually focused on the latest technological developments for a greater and more efficient clean energy production. However, geothermal energy is among the most capital-intensive oriented renewables, and thus design efficiency is obviously very important, but it must be accompanied by maximum efficiency and operation hours during the average 20/30 years of functioning of the power plant. Renewable power plants have to produce energy and not only power. Regardless of the geographical position and the technology employed, there are specific factors that guarantee a long and effective operation of the plant, and therefore increase revenues. Geothermal power plants, on average, register an availability rate between 97% and 98%, through this presentation EXERGY will describe what are the key factors that allowed to obtain a 99+% average availability rate for its geothermal power plants

1. Luca Xodo
Head o f S ales
1
Key factors for top availability
of geothermal power plants
– Exergy’s Experience
European Geothermal Congress
12th June 2019

2. 2
SUMMARY
› Winning Factors for geothermal power plants
› Exergy’s references

3. 3
WINNING FACTORS OF A GEOTHERMAL
POWER PLANT
Every geothermal project needs the
following factors for its success:
› High plant availability for constant
and reliable revenues production
› Reduced environmental impact to
ease the process of obtaining
permits and facilitate the local
community support

4. 4
EXERGY’s PLANT AVAILABILITY
Site Customer Operation Year Output gross Availability
Kubilay Bestepeler Enerji 2016 27 MW 98.6 %
Karkey-Umurlu 2 Karadeniz Holding 2016 12 MW 99.1 %
Saraykoy 2 Greeneco Enerji 2016 12 MW 99.0 %
Mehmet Han Kipas Holding 2016 25 MW 99.1 %
Ken Kipas Kipas Holding 2016 25 MW 99.8 %
Karkey-Umurlu I Karadeniz Holding 2015 12 MW 99.5 %
Saraykoy Greeneco Enerji 2015 12 MW 99.3 %
Denizli – Tosunlar Akca Enerji 2014 3.5 MW 99.5 %
Bagnore Enel Green Power 2012 1 MW 99.3 %
Over 98.5% availability in all the tracked units, average 99.2%

5. 5
TOP AVAILABILITY FACTORS
Plant Configuration
10%
Materials Choice
5%
Erection & Commissioning
Execution
15%
Planning Maintenance Activities
15%
Training of Operator/Client
10%
Careful Choice of the Operation
Personnel
10%
Excellent Knowledge of ORC
process for Remote Support
15%
Spare Parts Stock
15%
Dedicated Site Staff
5%
Plant Configuration Materials Choice
Erection & Commissioning Execution Planning Maintenance Activities
Training of Operator/Client Careful Choice of the Operation Personnel
Excellent Knowledge of ORC process for Remote Support Spare Parts Stock
Dedicated Site Staff

6. 6
FACTOR 1 – PLANT CONFIGURATION
Plant configuration 10%

7. 7
PLANT CONFIGURATION
The configuration of the ORC plant must take
into account the desired level of availability and
reliability:
› Correct design to the resource and location
conditions
› Appropriate redundancies of the equipment
and minor items (e.g. pumps,
instrumentation)
› Accessibility of the components for
maintenance operation
› Equipment design to facilitate maintenance
and reduction of plant downtime (Special
maintenance for the mechanical group)

8. PLANT CONFIGURATION
8
Mechanical group Maintenance

9. 9
FACTOR 2 – MATERIAL SELECTION
Material choice 5%

10. 10
MATERIALS SELECTION
The selection of correct material is key
to maintaining high availability.
During the design phase, the following
aspects have to be taken in
consideration:
› Chemistry of the geothermal fluid and
dosing chemicals
› Geothermal harsh environment with
presence of H2S
› Other environmental factors (extreme
temperatures, atmosphere humidity
and salinity)

11. 11
FACTOR 3 – ERECTION & COMMISSIONING
Erection & Commissioning 15%

12. 12
ERECTION AND COMMISSIONING
Having designed and constructed 25
geothermal power plants, in only 6 years,
we have developed internal quality
procedures for the correct execution of
construction and commissioning phases
to guarantee high quality standards even
under tight project schedules and short
deadlines

13. 13
FACTOR 4 – TRAINING
Training of operators/client 10%

14. 14
TRAINING OF THE OPERATORS/CLIENT
day Description Location
1 Introduction to ORC Exergy office
1 Plant process principles Exergy office
1 Plant process description Exergy office
2 Mechanical system description #1 Exergy office
2 Mechanical system description #2 Exergy office
2 ORC Electrical system description Exergy office
3 ORC Control system description Exergy office
3 Operating principles Exergy office
4 Operation Exergy office
4 Operation Exergy office
5 Safety Exergy office / working fluid supplier office
5 Safety Exergy office / working fluid supplier office
6 Transfer to site Exergy ORC plant
6 Plant introduction Exergy ORC plant
6 Plant visit and explanation Exergy ORC plant
7 Practical Site activities Exergy ORC plant

15. 15
FACTOR 5 – PLANNING OF MAINTENANCE
Planning of maintenance
activities 15%

16. 16
PLANNING OF MAINTENANCE ACTIVITIES
A correct planning and execution of the
maintenance activities is key to obtain high
plant availability. Exergy provides after
sales service contracts which include:
All the main programmed maintenance
activities that cause unavailability in a binary
plant are addressed within the service
contract. It is key to properly predict and
schedule the activities to be done in order to
reduce at minimum plant downtime.
› Remote assistance 24/7 online and
by phone
› Up to 2 services per year by Exergy
technicians
› Preventive monitoring of parts
replacements
› Filters, seals and fluids replacement
› Control and monitoring of systems
checks

17. 17
FACTOR 6&7 – OPERATION PERSONNEL
Careful choice of
operation personnel 10%
Site staff 5%

18. 18
SELECTION OF OPERATION PERSONNEL
AND SITE STAFF
The site staff have to be carefully
selected and trained for correct
operation of the plant:
› Experienced personnel
› Committed to the good result of
the project and proactive in
looking for problems and rapidly
solve them
A good team of site personnel is
generally composed by one
mechanical and one electrical
technician that remain 24/7 at site

19. 19
FACTOR 8 – KNOWLEDGE OF ORC PROCESS
Knowledge of ORC process for remote support 15%

20. 20
KNOWLEDGE OF ORC PROCESS AND
REMOTE SUPPORT
Exergy’s service personnel is:
› Experienced on numerous
other geothermal power
plants
› Constantly trained and
updated
› Involved in the project from
the early design phases

21. 21
FACTOR 9 – SPARE PARTS STOCK
Spare parts stocks 15%

22. 22
SPARE PARTS STOCK
The selection of the correct spare
parts list and replacement
strategy depend on the following
factors:
› Plant design
› Plant accessibility and shipping
logistics
› Customer’s Business Plan

23. 23
CONCLUSION
› EXERGY binary power plant register very high
availability records.
› The correct management of some key plant
factors is key for reliable and constant operation
of binary power plants which result in constant
revenues and successful business plans

24. REFERENCES
24

25. EXERGY REFERENCES
25

26. 26
EDA REN OVAVEIS,
PICO ALT O,
T E R C E I R A ( A Z O R E S , P T )
Y E A R : 2 0 1 5
A P P L I C A T I O N : G E O
P O W E R : 4 M W

27. 27
BEŞTEPELER
ENERJI,
KUBILAY 1,
TURKEY
Y E A R : 2 0 1 5
A P P L I C A T I O N : G E O
P O W E R : 2 4 M W

28. 28
GREENECO
ENERJI,
SARAYKÖY 1,
TURKEY
Y E A R : 2 0 1 5
A P P L I C A T I O N : G E O
P O W E R : 1 2 M W

29. 29
ENERGY
HOLDING,
KEMALIYE 1 & 2
TURKEY
Y E A R : 2 0 1 5
A P P L I C A T I O N : G E O
P O W E R : 1 2 M W

30. 30
KEN KIPAS,
MEHMET HAN,TURKEY
Y E A R : 2 0 1 5 A P P L I C A T I O N : G E O
P O W E R : 2 5 M W

31. 31
KARADENIZ
HOLDING,
UMURLU 1,
TURKEY
Y E A R : 2 0 1 5
A P P L I C A T I O N : G E O
P O W E R : 1 2 M W

32. 32
AKÇA ENERJI
DENIZLI,
TURKEY
Y E A R : 2 0 1 4
A P P L I C A T I O N : G E O
P O W E R : 4 M W
C l i c k f o r v i d e o

33. H E A D O F F I C E
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40123 Bologna (BO) ITALY
Via Santa Rita, 14
21057 Olgiate Olona (VA) ITALY
Tel +39 0331 18 17 711
Fax +39 0331 18 17 731
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E X E R G Y - O R C . C O M
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