| Abbreviation | Description | Abbreviation | Description |
| A/C | Air Conditioning | b/w | Between |
| A/G | Above ground | BB | Bus Bar |
| A1-CC1 | Combined cycle Block A 1.1 | BCS sys | Bulk Chemical Storage System |
| A1-CC2 | Combined cycle Block A 1.2 | BCSB | Bulk Chemical Storage Building |
| ACB | Air Compressor Building | BF | Boiler feed |
| ACC | Air cooled condenser | BFP | Bolier feed pump |
| Acc | Accessories | Bldg. | Building |
| ACDB | Alternating Current Distribution Board | Blkwl | Blockwall |
| AGC | Automatic Generation Controle | BOP | Balance of plant |
| AHU | Air Handling Units | BPM sys | Boiler Performance Monitoring |
| Alm | Alarm | BR | Battery Room |
| Amb Temp | Ambient Temperature | BSDG | Black start deisel generator |
| Anc Blt | Anchor Bolt | BVR sys | Boiller Vent Recovery System |
| APP | Approval | EA | Equipment Arrangement |
| APU | Air processing unit | Elect'l | Electrical |
| Arch | Architectural | Elv | Elevation |
| Arg | Arrangement | Emg | Emergency |
| Aux | Auxiliary | EOT | Electronicall Operated over Head Travelling |
| Eqpt Fnd | Equipment Foundation | ||
| DB | Distribution Board | ER | Electrical Room |
| DC | Direct curent | ERP | Engineering requisition package |
| DCS | Distributed control system | ES | Exhust Silencer |
| Desc | Description | Ess | Essential |
| DFWB | Diesel fire water boiler | Excv. | Excavate |
| DFWH | Diesel fire water heater | Ext | External |
| Diag | Diagram | GA | General Arrangement |
| Dim | Dimension | GCB | Generator circuit breaker |
| Dlg | Deluge | Gen | Generator |
| DM | Demineralised | GF | Ground Floor |
| DOFS | Diesel oil forwarding station | GIB | Gas Insulated Bus |
| DPS sys | Dual Pressure Steam System | GIS | Gas insulated switchgear |
| Drng | Drainage | GLAC | Generator Line accessories compartments |
| DRO | Driver reception office | GNAC | Generator nuetral accessories compartments |
| Dsn Crt | Design Criteria | GPS | Global Posioning System |
| Dtcn | Detection | GSU | Generator step-up transformer |
| DW | Demineralized Water | GT | Gas turbine |
| Dwg | Drawing | GTG | Gas turbine generator |
| CCGT | Conbined Cycle Gas Turbine | I& C | Instrumentation & Control |
| CCPB | Combined Cycle Power Block | IA | Instrument air |
| CD sys | Chemical Dosing System | ICPSA | Inflamble consumble product storage area |
| CEMS | Continuous emission monitoring system | Impdg | Impounding |
| CFOFPSB | Crude fuel oil forwarding pump station building | IMS | Inforamtion Management Sys |
| Clas | Classification | Indst | Industrial |
| CLR | Current Limiting Reactor | Insp | Inspection |
| CMMS | Computrized Maintanace Management System | Inst | Installation |
| CMU | Concrete machinary unit | Instr | Instrumentation |
| Cnd | Conduit | Intrc | Interconnection |
| Cnt | Control | IPBD | Isolated phase busduct |
| CO | Crude oil | IRB | Iron Removal Building |
| CO2 | Carbon Dioxide | Iso | Isometrics |