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Brochure rwe ag

May 26, 2015

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Technology

  • 1. RWE PowerADELE ADIABATIC COMPRESSED-AIR ENERGYSTORAGE FOR ELECTRICITY SUPPLY

2. RWE PowerRWE POWER ALL THE POWERRWE Power is Germanys biggest power producer and a leading player in the extraction of energyraw materials. Our core business consists of low-cost, environmentally sound, safe and reliablegeneration of electricity and heat as well as fossil fuel extractionIn our business, we rely on a diversified primaryIn this respect, our business activities are embeddedenergy mix of lignite and hard coal, nuclear power,in a corporate culture that is marked by team spiritgas and hydropower to produce electricity in the and by internal and external transparency. With anbase, intermediate and peak load ranges. about 30 per cent share in electricity generation, we are no. 1 in Germany, and no. 3 in Europe, with a 9RWE Power operates in a market characterized byper cent share. We wish to retain this position infierce competition. Our aim is to remain a leading future as well. And that is where we want to stay.national power producer and expand our international Which is why we are investing our own energy inposition, making a crucial contribution toward shaping shaping and designing the energy supply of thefuture energy supplies. A strategy withfuture. Our aim: harmonizing the claims of economicthis focus, underpinned by efficient cost efficiency, security of supply and climate protection.management, is essential for our success.We provide impetus with ourAll the same, we never lose sight ofknow-how, innovative Hard coalone important aspect of ourtechnologies and considerable Lignite with integratedcorporate philosophy:Bremenopencast mines investment.environmental protection. At Natural gas Nuclear power stationsRWE Power, the responsibleSo research and development Other conventionaluse of nature and itspower plantsare of strategic importanceresources is more than Hydropower stations **for us. Our scientists and* in deconstructionmere lip service. Our** RWE Power including holdings engineers are pursuingDortmundhealthy financial base,Essenas well as plants operated visions, tapping potentials,on behalf of RWE Innogyplus the competent and Aachen Cologneimplementing ideas. Thiscommitted support of innovative power strengthens*some 17,800 employeesFrankfurtthe company in the face of growingunder the umbrella ofMainzcompetition and on the way ahead. ItRWE Power enable uscreates the preconditions for a secureto systematically Saarbrcken energy supply and economicexploit the opportunitiessuccess. That is what we areoffered by a liberalized energyStuttgartworking for with all ourmarket. power. Munich hcinuM 3. ENERGY MANAGEMENT COMPRESSED-AIR ENERGY STORAGE (CAES) ASBUFFER FOR ELECTRICITY FROM WIND AND SUNThe demand for flexible balancing power to maintain grid stability shows strong growth.By 2020, the share of renewable energy in Germanyspower generation is set to rise from todays 15% orso to 30%. The biggest slice of the new-buildsrequired besides biomass will be accounted forby wind power and photovoltaics: the renewal ofturbines onshore alone and extensions offshore willdouble the installed capacity of wind power to near-ly 50,000 megawatts (MW). The feed-in of wind andsolar power is weather-dependent, however, and isextremely intermittent as experience has shown between zero and 85% of the max. installed capacity.So if the electricity grid is to remain stable, thesePower consumption and power generation from wind in the VETfluctuations must be balanced. This is because the grid zone (February 2008) (source: VDE study)amount fed in and the amount consumed must bethe same at all times. Today, flexibly deployable, the growing share of combined heat and powerconventional power plants are used for this, as a rule generation (CHP), they will tend to decline ratherpumped-storage, natural-gas and hard-coal powerthan increase. Still, CHP plants, too, are not gearedstations.to the electricity demand; their operation follows the demand for heat. Upshot: the need for flexibleIn certain weather conditions, their capacities arepower-plant capacity, i.e. for amounts of electricityalready nearly exhausted today. Moreover, thanks toavailable in the short term, is growing rapidly. This is where storage technology comes in: whenever supply exceeds demand, e.g. on a windy day, the power can be stored and then fed into the grid again during a calm. If this succeeds on a large scale, the interaction of conventional power plants with renewable resources can be optimized. Storage technologies will not be a panacea, but could gain considerably in importance on tomorrows electricity market. 4. STATE OF THE ART TODAYELECTRICITY STORAGE TODAY:PROVEN TECHNOLOGY, NEW APPROACHESThe technology of choice today is the pumped-storage power plant. In any excess power supply,water is electrically pumped into a reservoir on a hill, so that it can be discharged when powerdemand is high to drive a turbine in the valley. Efficiency is between 75 and 85%. 1978, and another in McIntoshPhysical background: when air is Today, Germany has pumped-(Alabama, USA) since 1991. The compressed, heat, too, is produced, storage power plants producingefficiency of the 320-MW plant inbesides pressure. This can be a total of about 7,000 MW. TheHuntorf is about 42%, that ofobserved when using a bicycle expansion potential is severely McIntosh around 54%. This meanspump, for instance. Conversely, limited, especially in northern that they are more than 20 cold emerges when compressed Germany where the balancing needpercentage points below thegas escapes and loses pressure. is greatest.efficiency of pumped-storage This can be felt, e.g., when refilling plants.a gas lighter. Compressed-air energy storage (CAES) is similar in its principle: What lowers the efficiency: during the phases of excess first, the air that he ats up during availability, electrically driven compression must be cooled down compressors compress air in a again to the ambient temperature cavern to some 70 bar. Forbefore it can be stored in the cavern. discharge of the stored energy, Second, the cold air must be re- the air is conducted via an air heated for discharge of the storage turbine, which drives a generator.facility since it cools strongly when expanding in a turbine for power Just as in pumped storage, itsgeneration. Todays plants use Herdecke pumped-storage power plant power can be released very quickly. natural gas for this. Valuable One merit over pumped storage,efficiency percentages are lost. Turbine hall of the Vianden pumped- however, is that the visible impactstorage power plant on the landscape is low. What is more, the facilities can be built near the centres of wind-power production, especially in central and northern Germany. Today, there are two CAES plants: one in Huntorf (Lower Saxony) since 5. ADELE ADIABATIC COMPRESSED-AIR ENERGYSTORAGE WITH BETTER EFFICIENCYRWE Power is working along with partners on the adiabatic compressed-air energy storage(CAES) project for electricity supply (ADELE). Adiabatic here means: additional use of thecompression heat to increase efficiency.RWE Power is working along with partners onadiabatic CAES power station up to bidding maturitythe adiabatic compressed-air energy storagefor a first demonstration plant. The federal ministry(CAES) project for electricity supplyfor economics has held out a prospect of funding for(ADELE). Adiabatic here means: additionalthe ADELE project.use of the compression heat to increaseefficiency.When the air is compressed, the heat is notreleased into the surroundings: most of it iscaptured in a heat-storage facility. Duringdischarge, the heat-storage device rereleasesits energy into the compressed air, so that nogas co-combustion to heat the compressedair is needed. The object is to makeefficiencies of around 70% possible. Whatis more, the input of fossil fuels is avoided.Hence, this technology permits the CO2-neutral provision of peak-load electricityfrom renewable energy. That this technologyis doable has been shown by the EU projectAdvanced Adiabatic Compressed Air EnergyStorage (AA-CAES) and by a study presentedby General Electric and RWE in 2008.The aim of the new joint project mountedby the German Aerospace Center (DLR), Ed.Zblin AG, Erdgasspeicher Kalle GmbH, GEGlobal Research, Ooms-Ittner-Hof GmbH andRWE Power AG the project being officiallysealed in January 2010 is to develop an 6. RESEARCH NEED: SYSTEMUNRIVALLED WORLDWIDEPioneering work: six partners from industry and research want to bringadiabatic CAES technology up to industrial-scale application maturity. In day-to-day charging and discharging operations, a commercial RWE Power is coordinating the plant should store some 1,000 MW hours of electrical energy project. As future operator, it is and feed some 300 MWel into the grid for several hours. The drawing up the requirement demonstration plant, which is necessary as a preliminaryprofile. This comprises, among stage in the development line and is, in the nature of things,other things, the deployment smaller, could probably go on stream in 2016 at the earliest. strategy, availability and operating ADELE is bundling the know-how and experience of a power- safety issues. Investigations are plant operator, the manufacturing industry and research in an assuming day-cycle-based effort to clarify the open issues of the technology.operations geared to the spot market with proportionate provision of balancing energy. The vetting of feasible locations, too, is on RWE Powers work schedule. The optimal interplay of all technical components, i.e. the system design, is the projects core task. Under the lead management of GE Global Research in Garching, specialists are clarifying the overriding mechanical-engineering and thermodynamic issues and working out the best-possible configuration for compressor, turbine, heat-storage device, cavern and other units. The final result will