Pressurized Air Cooled Generators

PGI Orlando Dec. 13, 2016 Pressurized Air Cooled Generators Mike Zborovsky New App Generator Portfolio Owner siemens.com

Pressurized Air-Cooled Generator (SGenX-2000P) Table of content Introduction 3 Portfolio Overview SGen-2000P Air Cooled Generator 7 2000H vs. 2000P Overview & Benefits Design Features & Components Auxiliary System Operational Flexibility & Interfaces Access & Serviceability Summary 20 Page 2

Generators Product Overview SGen-100A series Customized for use on smaller gas and steam turbines, most economical and efficient design for multi-shaft applications Page 3 SGen-2000H series Preferred choice for large outputs SGen-3000W / 4000W series Optimized for extreme outputs and designed for steam power plants

Generators Product Overview Existing Future Segment Cooling Size Cooling Size Indus. Fossil Nuc H 2 / H 2 O Air H 2 1000-2235 MVA (4P) 560-1280 MVA 370-565 MVA 165-370 MVA 300 MVA 25-65 MVA Air / H 2 O H H2O 2 O / H 2 Air Air 1000-2235 MVA (4P) 850-1280 MVA 550-850 MVA 370-550 MVA 25-370 MVA Generator Development Focus Simplified portfolio with lower complexity and increased sameness across products; product development focus up to ~850MVA Page 4

Future Generator Portfolio with SGen-2000P Air-Cooled Machine with Water Cooled Stator Existing Future Segment Cooling Size Cooling Size Indus. Fossil Nuc H 2 / H 2 O Air H 2 1000-2235 MVA (4P) 560-1280 MVA 370-565 MVA 165-370 MVA 300 MVA 25-65 MVA Air / H 2 O H H2O 2 O / H 2 Air Air 1000-2235 MVA (4P) 850-1280 MVA 550-850 MVA 370-550 MVA SGenX-2000P 25-370 MVA SGenX-2000P replaces traditional indirectly cooled hydrogen generators Page 5

SGen-2000P Side by Side Comparison Hydrogen Cooled vs Pressurized Air-Cooled SGen-2000H Technical data: Hydrogen-cooled SGen-2000P Technical data: Pressurized air-cooled Apparent power 370-565 MVA Apparent power 370-550 MVA Terminal voltage up to 22 kv Terminal voltage up to 22 kv Stator insulation GVPI; Class IEC B Stator insulation GVPI; Class IEC B Shaft sealing Performance plus TM Shaft sealing Brush seal Ventilation 1-stage axisymmetric radial-cooled rotor & stator Ventilation 1-stage axisymmetric radial-cooled rotor & stator Coolers 2 x Omega coolers Coolers 3 x horizontal / transverse Total weight 350 t Total weight 339 t Rotor overall length 12.2 m Rotor overall length 11.2 m Generator dimensions Length: Width: Height: 10.3 m 3.9 m 4.0 m Generator dimensions Length: Width: Height: 9.6 m 3.9 m 4.3 m SGen-2000H Hydrogen-Cooled SGen-2000P Pressurized Air-Cooled Page 7 Hours as reported to Siemens; rated values; unit-specific values may vary

SGen-2000P Overview & Benefits Market Differentiator with Innovative mix of Siemens Technology 100A: Air-Cooled Technology >300MVA up to ~370MVA ~940 units in fleet > 30,909k operation hours 99.2% Availability; 99.7% Reliability ~550MVA up to ~900MVA GVPI stator Radially cooled rotor Symmetrical single stage blower Simple frame & interfaces Pedestal bearings Integral collector 3000W: Water-Cooled Technology Water-Cooled Stator Stator water manifolds Aluminum end plate (w/o shield) Stator water skid ~140 units in fleet > 8,409k operation hours 98.1% Availability; 99.3% Reliability 2000P: Pressurized Air With Water Cooled Stator Winding Up to ~550MVA Owner/Operator Benefits Verified extended cooling technology with air (no hydrogen) Water-cooled stator winding for maximum operating flexibility ramp rates, start stops Efficiency comparable to hydrogen (H2) technology Low OPEX with fewer auxiliaries Stainless steel tubes less sensitive to water chemistry New design features Air supply skid Directly air cooled parallel rings Product line use of common components improves availability of spare parts. Page 8 Hours as reported to Siemens; rated values; unit-specific values may vary

SGen-2000P Design Features Legend: Verified component from 1000A & 2000H series Verified component from 3000W series Water Manifold Outlet Stator Core Stator Frame IPB Support Bushings Lead Box from 1000A Man Access Water Cooled Stator Coils Bearing Pedestal Lifting Trunnion Core to Frame Attachment Integral Collector Bed Plate Page 9 Coolers New Arrangement Stator End Winding from 2000H Conceptual illustration; not to scale

SGen-2000P Verified Components Added to Base Air-Cooled Generator 1 Component Basis Experience Water Cooled Stator Coils (GVPI) 2 Water Manifolds 3 Parallel Rings 3000W >140 units* >20yrs fleet exp. >8M OH 4 4 Component Basis Experience Coolers (internal to frame) Stator Frame, Stator Core, Core-to-Frame, End Windings, Rotor, Bearings, Excitation 100A 2000H 3000W 100A 2000H 3000W >1400 units* >30yrs fleet exp. >60M OH >1250 units* >30yrs fleet exp. >50M OH 1 2 3 * Based on # units reporting to Siemens. Manufactured fleet significantly higher. 4 4 4 2 SGenX-2000P generator design consists of verified components & manufacturing technology with long history of successful field operation Page 10 *Conceptual illustration; not to scale

Generator Auxiliary Interfaces SGen-2000P vs. Traditional Hydrogen Cooled Unit Lower plant complexity, with operational flexibility Waste Gas System Stator Water System Seal Oil System Waste Gas System Eliminated Additional Gas Supply System Air Supply System SGen-2000P eliminates potential issues related to hydrogen gas Page 11

SGen-2000P Air Supply Skid User Friendly and Reliable Simple and modular skid layout with verified industry standard components 2 self controlled screw compressors 2 automatic air dryer Storage, Control Drying Filtering, Compression Overall control & monitoring by plant I&C Page 12 *Conceptual illustration; not to scale

SGen-2000P Operational Flexibility & Interfaces Operational Flexibility 1 Pressurized - Air at atmospheric or positive pressures (up to 1bar gauge); controlled leakage rates within limits of auxiliary air system 2 Extended Output - Variable pressurization enables flexible operation in extended capability range; rotor temperature control logic. 3 Market Flexibility - Water cooled stator for thermal cyclic loading of stator due to high start / stops and ramp rates Variable pressure 1 2 Rotor Temp Control P N Variable Air System Air System Operation at nominal active power output P N at PF ~1 and leading PF does not require pressurization Reduced potential for unit shut down solely due to loss of pressurization Page 13

SGen-2000P Pressure & Sealing Simplified I&C and Sealing Load dependent air pressure control Generator designed to maintain slight overpressure to avoid contamination (semi-closed system comparable to hydrogen cooled generators) Pressure control by rotor winding temperature Pressurizing only at high excitation current, lagging power factor Continuous fresh air supply, intended air exchange to maintain low dew point Shaft seal design Brush seal attached to bearing pedestal vapor seal Reference from steam turbine design Brush seal expected design life ~ 30 years (max. leakage rates for worn brush seals considered in design) Page 14 Conceptual illustration; not to scale

SGen-2000P Accessibility for Assembly & Service Activities A TE B C no access for operators C B EE D E D (A) Lead box (B) Before blower (C) ID stator end winding (D) OD stator end winding (E) Cooler area Page 15

SGen-2000P provides total cost of ownership benefit as compared to traditional hydrogen cooled (2000H) Generator auxiliaries incl. piping Generator auxiliaries incl. piping 2000H 2000P 2000H 2000P Argon consumption H 2 consumption H 2 refill 0 2000H 2000P - 63% installation effort - 68% commissioning effort - 220K operational costs* Serviceability 2000H 2000P -58% -44% -53% -17% -46% -21% outage duration man hours outage duration man hours outage duration man hours Minor Inspection Medium Inspection Major Inspection Page 16 ~30% LTP cost savings No rotor disassembly over entire lifecycle Maintenance free stator due to GVPI technology

SGenX-2000P: Validation Plan Basic Design Electrical (incl. insulation Mechanical Thermal (cooling) Final Design Planning of Validation Purchasing & Manufacturing Factory Test Validation In Service R3 R5 R7 Ex R8 R9 Implementation of concept design QA mechanical & electrical tests during manufacturing PPQ s & IPPQ s Verification of design requirements, validation of concept design Commissioning, test operation until PAC Tests and test conditions Rotor balance Ventilation test Short circuit and open circuit characteristics Short circuit and open circuit heat runs 3 phase sudden short circuit Determination of efficiency Modal test Determination of reactances Rotor moment of inertia Bearing performance Measurements Rotor vibration and critical speed Air flow and blower capability Short circuit and open circuit characteristic curves Winding temperatures Frame, core and winding vibration Generator losses Component natural frequencies Noise level Stator winding operation deflection shape Page 17

Siemens GVPI Technology (Global Vacuum Pressure Impregnation) >27 years of fleet operation experience Number of Generators in GVPI-Technology CLT More than 1650 generators Location Rating MLH 25-870 MVA 10 22 kv Excellent operational experience of more than 1650 generators with > 25 Mio. OH s Page 18

Summary SGen-2000P Generator Product Line Overview & benefits Verified cooling technology in Air No hydrogen Maximum operating flexibility Generator design features Verified components and manufacturing technology Long history of successful field operation Interfaces & operation No added potential for shut down solely due to loss of pressurization Efficiency of pressurized air (SGen-2000P) comparable to hydrogen cooled (SGen-2000H) technology Auxiliary systems Fewer plant interfaces compared to hydrogen cooled generators Less installation time, lower maintenance cost and lower total cost of ownership Serviceability Full serviceability is confirmed with less effort than traditional hydrogen cooled generator products Page 20

Turbine Generator Product Introduction; Dec 16 Pressurized Air-Cooled Generator (SGen-2000P) Generator Portfolio Strategy & R&D Mike Zborovsky james.zborovsky@siemens.com Q&A Page 21

Disclaimer This document contains statements related to our future business and financial performance and future events or developments involving Siemens that may constitute forward-looking statements. These statements may be identified by words such as expect, look forward to, anticipate intend, plan, believe, seek, estimate, will, project or words of similar meaning. We may also make forward-looking statements in other reports, in presentations, in material delivered to shareholders and in press releases. In addition, our representatives may from time to time make oral forward-looking statements. Such statements are based on the current expectations and certain assumptions of Siemens management, of which many are beyond Siemens control. These are subject to a number of risks, uncertainties and factors, including, but not limited to those described in disclosures, in particular in the chapter Risks in the Annual Report. Should one or more of these risks or uncertainties materialize, or should underlying expectations not occur or assumptions prove incorrect, actual results, performance or achievements of Siemens may (negatively or positively) vary materially from those described explicitly or implicitly in the relevant forward-looking statement. Siemens neither intends, nor assumes any obligation, to update or revise these forward-looking statements in light of developments which differ from those anticipated. Trademarks mentioned in this document are the property of Siemens AG, its affiliates or their respective owners. TRENT and RB211 are registered trade marks of and used under license from Rolls-Royce plc. Trent, RB211, 501 and Avon are trade marks of and used under license of Rolls-Royce plc. Page 22