- ERG 000: Belonging to the Subject; not further Classified
- ERG 001: Energy Technology, Energy Economics in General
- ERG 020: Energy Economics; Energy PoliticsEnergy Consumption of Food Industries see LEB 972
- ERG 025: Organization and Planning
- ERG 030: Energy Supply >>> Resources
- ERG 035: Energy Requirement
- ERG 040: Energy Consumption; Energy Costs
- ERG 045: Energy Supply (including Public Utility >>> Municipal Utilities, Energyproviders, ...)
- ERG 050: Energy Transmission >>> Conduction and DistributionEnergy Transmission >>> Heat Conduction; Energy >>> Heatdistribution see also ERG 535
- ERG 055: Energy Conservation >>> SavingThermal Energy >>> Heat Recovery see ERG 520
- ERG 080: Energy and Environment (Risk Discourse >>> Discussion, ...)Environmental Sciences see UMW ff
- ERG 099: Other
- ERG 100: Planning and Operation of Power PlantsPower Plants / Power Stations see also ERG 600 ff
- ERG 120: Power Plant Locations (including Legal Requirements)
- ERG 140: Design of Power Plants Dimensioning
- ERG 160: Power Plant Construction
- ERG 180: Power Plant Operation
- ERG 185: Power Plant Control
- ERG 190: Other
- ERG 025: Organization and Planning
- ERG 200: Energy Sources; Energy Production; Power >>> Energy Generation
- ERG 210: Non-Renewable Energy Sources; Fossil Fuels
- ERG 220: Gas Engineering; Technical GasesGaseous Fuels; Technical Gases see CIT 600
- ERG 225: Gas Production; Gas Generation
- ERG 230: Natural Gases / Biogases
- ERG 240: Cokery >>> Coking (Degassing/degasification) and Cokery >>> Cokingtechnology in General
- ERG 242: Gas Works
- ERG 244: Cokery >>> Coking Plant; Coke Production; CokeMetallurgical Coke / Blast Furnace Coke see HUE 370
- ERG 246: Coal Gas; City Gas
- ERG 249: Other
- ERG 242: Gas Works
- ERG 250: Carburation / Gasification and Gasification Facilities >>> PlantsCombustion; Incineration; Flames, Pyrolysis in General see ERG 420
- ERG 255: Gas Generators
- ERG 260: Coal Processing >>> Refinement
- ERG 261: Coal Gasification
- ERG 262: Coal Hydrogenation; Coal Liquefaction
- ERG 263: Coal PyrolysisCombustion; Incineration; Flames, Pyrolysis in General see ERG 420
- ERG 265: Wood Gasification; Wood Carbonization; Wood Distillation
- ERG 268: Other
- ERG 261: Coal Gasification
- ERG 270: Other Technical GasesLiquefied Gases see CIT 573
- ERG 300: Transformation / Conversion and Refinement of Gaseous FuelsAir see also UMW 200 ff
- ERG 225: Gas Production; Gas Generation
- ERG 350: Gas Supply
- ERG 400: Fuel >>> Burner and Furnace Technology; Industrial Powerengineering >>> Energy Technology
- ERG 500: Heat Engineering; Thermal Energy Economics >>> Heat Economy;thermal Energy >>> Heat Supply (MTA 700)
- ERG 510: Thermal Power >>> Energy Generation (Heat Generators)Steam Generation; Steam Boilers see MAS 450
- ERG 520: Heat and Waste-Heat Utilization; Heat Recovery
- ERG 530: Heat Supply Systems; Heating PlantsHeat Supply Systems Stations >>> Combined Heat and Power Plants see ERG 620 ff
- ERG 560: Heat Carriers >>> Transfer Media
- ERG 580: Heat Insulation; Protection against Heat
- ERG 590: Other
- ERG 510: Thermal Power >>> Energy Generation (Heat Generators)
- ERG 600: Power Plants / Power Stations
- ERG 610: Thermal Power Stations >>> PlantsDistrict Heating; Direct >>> Local Heating see ERG 545
- ERG 615: Steam Power PlantsSteam Generation; Steam Boilers see also MAS 450
- ERG 620: Heat Supply Systems Stations >>> Combined Heat and Power Plants
- ERG 640: Gas Turbine Power Plants; Combined Cycle Power Plants
- ERG 645: Coal Plants / Coal-Fired Power Plants
- ERG 650: Oil-Fired Power Plants; Gas-Fired Power Plants
- ERG 655: Industrial Power Plants
- ERG 615: Steam Power Plants
- ERG 660: Nuclear Power Plants; District >>> Nuclear Heating Plants
- ERG 670: Diesel-Electric Power Plants
- ERG 680: Hydro-Electric Power Plants
- ERG 690: Other
- ERG 610: Thermal Power Stations >>> Plants
- ERG 700: Alternative Forms of Energy; Unconventional Energy Forms >>>Non-Conventional Forms of Energy; Renewable Energy
- ERG 710: Geothermal Energy; Geothermal Power Plants
- ERG 720: Solar Energy; Solar Power Plants; Solar Engineering
- ERG 725: Solar Collectors; Solar FurnacesSolar Cells see ERG 940
- ERG 725: Solar Collectors; Solar Furnaces
- ERG 730: Wind Power >>> Energy; Wind Turbines / Wind Power Plants; Windmills
- ERG 740: Ocean Energy
- ERG 760: Heat Pumps
- ERG 770: Use of Hydrogen as Energy Source >>> Carrier
- ERG 780: Bioenergy; Biomass; Biogas FacilityMicrobial Biomass Generation >>> Production see CIT 975
- ERG 790: Other
- ERG 710: Geothermal Energy; Geothermal Power Plants
- ERG 800: Energy Storage
- ERG 820: Thermal Energy Storages (Latent Heat Storages, ...)
- ERG 840: Chemical Energy StoragesBatteries see ELT 972
- ERG 860: Mechanical Energy Storages (Flywheel Energy Storages, ...)
- ERG 890: Other
- ERG 820: Thermal Energy Storages (Latent Heat Storages, ...)
- ERG 900: Direct Energy Conversion
- ERG 910: Thermo-Electric Generators
- ERG 920: Thermo-Ionic Converters
- ERG 930: Magnetohydrodynamic (MHD-) GeneratorsMagnetohydrodynamics see PHY 575
- ERG 940: Solar Cells; Photoelectric Generators; PhotovoltaicsProduction Technology; Amelioration; Recultivation; Precision Agriculture; Consolidation and Reallocation of Agricultural Land; Fallow; Precision Agriculture see LAN 104
- ERG 950: Isotope Batteries (Nuclear >>> Radionuclide Batteries)
- ERG 990: Other
- ERG 910: Thermo-Electric Generators