1. RES Production of H2 Pathway to new energy landscape
Gaelle Hotellier Executive Vice President
Copyright © Siemens AG. All rights reserved

2. Big Picture Hydrogen Conversion of electrical into chemical power
Generation
Conversion In / Out
Utilization
Direct utilization w/o storage
Fuel Cell Car H2
H2-Storage
Mobility (H2-Fuel) O2 H2 H2
solar power + -
Gaspipeline „Convergence“
Gas-Turbine
Intermittent generation
CH4
Energy (Re-Electrification)
H2O
PEM-Elektrolyzer
injection
CH4 * H2
wind power H2
Steady generation
Methanation / CO2 utilization/ others
Industry
Industry (H2-Utilization)
Grid
CO2
fossile
H2 drives the convergence between energy, industry & mobility markets
*partially (in case of cheap power)
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3. The PEM technology uses a robust polymer membrane as electrolyte
Water Electrolysis Principle
Basics
Key specs
PEM* technology
DC current splits water into hydrogen and oxygen
production rate is related to current
9 liters of water yield 1 kg of hydrogen
approx. 50 kWh electrical energy generate 1 kg/h hydrogen
1 kg of hydrogen contain 33,3 kWh energy
2H20  2H2 + O2
H2O H2 O2
electrode
gas-diffusion-layer
bipolar plate
PEM-electrolyte
* Proton-Exchange-Membrane
purpose: - ion conductor (H+) - electric isolator - gas-tight separator
The PEM technology uses a robust polymer membrane as electrolyte

4. PEM Electrolyzers are technologically promising compared to alkaline technology
Dynamic
Maintenance +
Size + +
No caustic potash solution
No leaching
No precipitation
Cycles 0 % % without relevant aging
High current density allows compact construction €
Operability +
Operating costs +
No inert gas flushing
No protective electrodes current
No preheating
Highest dynamic for lowest current prices
Lifetime
Pressure + +
No caustic potash, less corrosion
High System pressures
Low compression costs
Construction +
Modular, scalable
Industrial standards

5. PEM Electrolyzers @ Siemens Leading edge technology for high capacity electrolyzers
Hydrogen: Enabling conversion between electrical and chemical energy
Excess Energy
Renewable Energy
Chemical Energy
PEM Electrolyzer Technology
Siemens Expertise
Robust polymer membrane as electrolyte
Extremely dynamic and tolerant to overload even under pressurized operation
High pressure operation without efficiency loss
Operation as dynamic load for secondary and even primary control power
Pure water – no leach
on-off switching without any delay
No N2-purge and preheating necessary
PEM electrolyzer development started 1998
Reference list in electrolyzer technology: - continuous lab operation > h - 10y field operation (prototype) bar prototype y electrode know-how
complete solution in one hand - heavy duty rectifiers (up to A) - transformers - control units - grid connection - gas turbines

6. First Siemens electrolyzer units under operation at customer sites.
kW PEM Electrolyzer Demonstrator
Key statements
Under operation
Rated power of the system is kW, peak power 300 kW (electrical stack input)
H2 and O2 are produced at an output pressure of 50 bar
The container is a „self-sustaining“ system. Power supply as well as water purification are onboard
The demonstrator was delivered to RWE in the context of the BMBF-funded project CO2RRECT*
*CO2-Reaction using Regenerative Energies and Catalytic Technologies
Siemens Elektrolyzer at the RWE site Niederaußem
First Siemens electrolyzer units under operation at customer sites.

7. Control power - Additional path for PEM Technology as it is based a. o
Control power - Additional path for PEM Technology as it is based a.o. on reaction time
Transmission System operators (TSOs) are responsible for safe and reliable network operations in their respective control area.
To fulfill the task “frequency stability”, TSOs need balancing power.
The Control Power call takes place timely phased and is split between primary and secondary (or minutes reserve) regulation.
Control Power can be either positive or negative (neg. =  consumption/  production; pos.=  production/  consumption)
2 business case opportunities: “demand price” (= stand-by) and “working price” (= release order)
Interesting link:
The Primary Control secure the rebalancing between produced and consumed power within seconds, whereat the frequency remains within the authorized limits.
The objective of the Secondary Control is to put the frequency back to its desires value und the power transfer to the agreed values, and herewith to have the whole activated primary regulation available as reserve again
In addition to the secondary regulation, the transmission grid operator need Minute reservel to restore free secondary balancing power range as well as the balancing of power deficits not being solved through secondary regulation only.

8. negative control power positive control power
PEM Siemens Operation as Control Power
Startup time (blackstart) ~ 10 min
From standby to full load in < 10 sec
Full dynamic behavior between 0 and 300% electric load (positive, negative or combined mode control power)
Power in %
providing
negative control power
providing
positive control power
normal operation
300%
negative Regellast:
200 %
200%
100%
positive Regellast:
100 kW
PEM electrolyzers can be operated as efficient dynamic load for secondary and even primary control power

9. Roadmap: PEM Electrolyzer Portfolio “SILYZER”21
SILYZER – Electrolyzer Systems from Siemens Up-scaling Roadmap “SILYZER family”
Roadmap: PEM Electrolyzer Portfolio “SILYZER”
Key take away
Product line I 0.1 – 0.3 MW
Product line II 1 - >10 MW
2012
2014
2015
Rated Powernominal
1 MW
10 MW
100 MW
0,1 MW
Product line III 10 - >100 MW
2018
Product line IB * >1 MW
Siemens has established the business unit “Hydrogen Solutions” to develop and industrialize PEM electrolyzer systems.
The Siemens PEM- electrolyzers will be cost- competitive to alkaline technology.
Modular Systems in the MW-range will be available starting 2015, demonstrators in the sub- MW-class in 2013.
SILYZER 100
SILYZER 100
SILYZER 200
SILYZER 300

10. I DT LD HY
Industry Sector Drives Technology Division Hydrogen Solutions
contact:
Gaelle Hotellier (Executive VP & General Manager)
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