PEM electrolyser technology Flexible, efficient and scalable

1 Siemens Energy is a registered trademark licensed by Siemens Siemens Ltd., 2021 PEM electrolyser technologyFlexible, efficient and scalable New Energy Business New Energy BusinessIntern Siemens Energy, 20212 July 2021 New Energy BusinessAt a glance| OverviewEarly EngagementsHIGHLIGHTE nable Hydrogen EconomyDecarbonization of steel production based on hydrogenH2 FUTURE1 A European Flagship project for the generation and use of hydrogen with the world s largest and most advanced hydrogen pilot facility in Linz, AustriaPartner H2 FUTURE1 Siemens | VERBUND | Voestalpine | Austrian Power Grid | K1 MET | TNO Project funded by EUHydrogen SystemsIndustry grade and highest quality green electrolyzer-based Power-to-hydrogen systems and servicesEnergy Consulting & Digital Services Electrolyzer-integrating Energy system design Specific Power-to-X related digital services and optimization solutionsPower-to-X-Solutions Electrolyzer-based Power-to-Hydrogenand Power-to-Liquidssolutions and services Electrolyzer-based turnkey solution package Our offeringsNew Energy BusinessIntern Siemens

2 Energy, 20213 July 2021 Sector Coupling is the key lever for decarbonization of all end-user sectorsSource: World Energy Balances 2018 Sector Coupling Links and InteractionsShares in global CO2emissions by sectorsTransport5%21%Other10%24%40%Build ingsIndustryPowerIncreased future focus for emission reductionShare on CO2emissions: 60% Share of Renewables: 8%Continuous emission reduction requiredShare on CO2emissions: 40% Share of Renewables: 22%SectorCouplingNew Energy BusinessIntern Siemens Energy, 20214 July 2021 PEM is competitive Competitive hydrogen price per kg at green electricity prices below 3 ct/kWh Small footprint Significantly lower OPEX2due to maintenance-free stackPEM is the natural choice for our future renewable energy system Incredibly fast start-up and shut-down Highest operational flexibility Cold start capabilityPEM is clean by nature No CO2emissions, unlike SMR1, which emits 8 10 kg CO2for each kg of hydrogen There is nothing except water.

3 Hydrogen and oxygen in the system Highest hydrogen purity > Oxygen as the only contaminant No aggressive chemical electrolyte ( in alkaline systems)Why a Proton Exchange Membrane (PEM) electrolyzersystem?1 SMR: Steam Methane Reforming | 2 OPEX: Operational ExpensesNew Energy BusinessIntern Siemens Energy, 20215 July 2021 Silyzerportfolio scales up by factor 10 every 4 5 years driven by market demand and co-developed with our customers Silyzerportfolio roadmap1 Operating Hours; Data OH & Nm as of Dec 20192011201520182023+2028+Silyzer 100 Lab scale demo~4,500 OH1, ~150k Nm of H2 Silyzer300 First investigationsin cooperation withchemical industryNext generationUnder MW1 MW10 MW100 MW1,000 MWSilyzer 200~86,500 OH1~ m Nm of H2 World s largest Power-to-Gas plants with PEM electrolyzersin 2015 and 2017 built by Siemens!

4 Biggest PEM cell in theworld built by Siemens!New Energy BusinessIntern Siemens Energy, 20216 July 2021 Silyzer300 The next paradigm in PEM electrolysis1 Ambient temperature 15 C, air kg>76 %24modulesSystem efficiency1(higher heating value)Power demandper full Module Array (24 modules)Hydrogen per hour per full Module Array(24 modules)to build a full Module ArraySilyzer300 Module Array (24 modules)New Energy BusinessIntern Siemens Energy, 20217 July 2021 Silyzer300 Fact Sheet1 Plant efficiency includes rectifier, transformer, transformer cooling and gas cooling |2 Primary Frequency Response Service | 3 With DeOxoHydrogen production 335 kg/hPlant efficiency (HHV1)> MWStart-up time<1 min, enabled for PFRS2 Dynamics in range10%/s in 0 100%Minimal load20% single moduleDimension full Mod.

5 Array x x mArray lifetime>20 a (Module 10 a)Plant availability~95%Demin water consumption10 l/kg H2 Dry gas quality399,9999%Delivery pressureCustomizedNew Energy BusinessIntern Siemens Energy, 20218 July 2021 The modular design of Silyzer300 can be easily scaled to your demands ModuleModule arrayCustomized solutionPlantBetween 12 and 24 modulesScale up to the necessary demandModular concept to cover wide production rateTransformerRectifierControl system+-Water refinementLV supply+-n+1 New Energy BusinessIntern Siemens Energy, 20219 July 2021 PowerEfficiencyWith the Silyzer300 you get a highly efficient plant 1 ISO conditions: 15 C, 1013 mbar, 0 m, 60% rel.

6 Humidity | 2 Atmospheric Plant w/ocompressionAuxiliariesMVLVH220 bar(a)10 CView for MW24 modules:Air cooledISO conditions1> > > C>76%Silyzer System+-PEM ModuleH2atm 60 CCooling system site specific optimizedNew Energy BusinessIntern Siemens Energy, 202110 July 2021 The Silyzer300 enables grid support services with efficient hydrogen yield and maximum dynamicsStart 0 100% H2<1 min, enabled grid supportDynamics in range10%/s in range 0 100%Time (s)100% +20sX+30s5%Rectifier loadH2 Delivery to TP1H2 VentilationDesigned for Future-Proof Flexible Hydrogen ProductionReady toinitializeOperationStand-byStand-byStartGrid SupportGrid SupportH21 Terminal Point New Energy BusinessIntern Siemens Energy, 202111 July 2021 Maintenance free module 80,000 OH1 Easy exchange of modulesNo cleaning effortWorld wideservice coverage Silyzer300 Latest and most powerful product line in the double-digit megawatt classHigh performanceHigh efficiency: System >76%Modular.

7 H2production range 100 2,000 kg/hDigitally enabledData Driven Operation and ServiceSecure Remote Support MindsphereHigh availability Advanced design for low degradationRobust industrial designFlexible operationFast start-up and shut-downHigh dynamicsHigh Gas purityNo hazardous chemicals Power factor compensation (optional)No permanent operating personnel required Maintenance friendly1 Operating HoursNew Energy BusinessIntern Siemens Energy, 202112 July 2021 Planning & ConsultingWhat can Siemens Energy offer to the P2X customers? Siemens Energy competence along the value chainElectrolysisPEM technologySilyzer 300 Machinery Compressors Storage systems Water treatment Elec.

8 Equipment Mech. equipment Turbines/engines(back up power)FinancingComponents and EquipmentCO2 / N2 SupplyElectrolysis WindPark Onshore wind Offshore Solar Fields/ Storage SystemsExternal Sourcing Synthesis Partnering CH3OH CH4 NH3 Own concepts Novel, flexible methanol reactor concept in R&D stagePtL-/PtG-EquipmentCO2 Capture Capture from flue gas (PostCap) DAC: externalN2 Supply Air separation: externalGrid ConnectionPower Grid Transmission Distribution substations Transformers Power cable systemsSiemens Energy covers important parts of the value chain to deliver Power-to-X projects on turnkey basisBoPSolution provider for Power-to-liquids( ) One face to the customer Overall system design Integration of Siemens products and technology & products from external partnersRenewable Power SynthesisDAC: Direct air capture: Under development.

9 No Siemens Energy activities | CCU: Carbon Capture and Utilization| typical share in value additionNew Energy BusinessIntern Siemens Energy, 202113 July 2021 EnergieparkMainz World s largest PEM electrolysis facility in MWPower MW peak power (limited in time) based on three Silyzer200 Customer: Energiepark Mainz (JV of Linde and MainzerStadtwerke) Country: Germany Installed: 2015 Product: Silyzer 200 Green hydrogen is fed into the local natural gas gridUse casesChallenge Installation of world s first PEM electrolysis plant in the multiple megawatt range Provision of balancing energy High degree of automationHydrogen for regional filling stationsDelivery to surrounding industrial companiesProject Installation of three Silyzer200 with a maximum power consumption of 6 MW Highly dynamic power consumption State-of-the-art process control technology based on SIMATIC PCS 7 Hydrogen processing, condensing, and storage (provided by Linde)

10 SolutionsNew Energy BusinessIntern Siemens Energy, 202014 July 2021H2 FUTUREA European Flagship project for generation and use of green hydrogen ProjectUse cases Partner: VERBUND (coordination), voestalpine, Austrian Power Grid (APG), TNO, K1-MET Country: Austria Installed: 2019 Product: Silyzer300 Challenge Potential for breakthrough steelmaking technologies which replace carbon by green hydrogen as basis for further upscaling to industrial dimensions Installation and integration into an existing coke oven gas pipeline at the steel plant High electrolysis system efficiency of 80%Solutions Operation of a 12-module array Silyzer300 Highly dynamic power consumption enabling grid services State-of-the-art process control technology based on SIMATIC PCS 7 Hydrogen for the steel making process Supply grid servicesThis project has received funding from the