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### NEEDS v.5.13 --- User Guide

Field Name Column Definition Key to Recurring Column Values Plant Name A The plant's name.

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UniqueID_Final B The unique identifier assigned to a boiler or generator within a plant. It consists of the Plant ID (or ORIS Code), an indication of whether the unit is a boiler ("B"), generator ("G"), or committed unit ("C"), and the Unit ID. For example, for the Unique ID "113_B_1", "113" is the Plant ID, "B" indicates that this unit is a boiler, and "1" indicates that the ID of the boiler is 1. ———

ORIS Plant Code C A unique identifier assigned to each power plant in NEEDS. While the ORIS code is unique for each plant, all generating units within a plant will typically have the same ORIS code. For committed units (i.e., those not currently operating, but firmly anticipated to be operational in the future), the entry in this field might be a dummy ORIS code assigned as a placeholder unique ID to the committed plant. (Note: ORIS originally referred to the Office of Regulatory Information Systems in the Department of Energy (DOE) Energy Information Administration (EIA) which was responsible for assigning unique identification codes to utility power plants.) ———

Boiler/Generator/Committed Unit D An indicator of whether the unit is a boiler, generator, or committed unit. Committed units are those with a future expected in-service date (see “On Line Year”) B = Boiler G = Generator C = Committed Unit

Unit ID E The identifier assigned to each unit (boiler and/or generator) in a given plant.

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CAMD Database UnitID F Unit-level identifier assigned by EPA's Clean Air Markets Division (CAMD) business system. Unlike other identification codes (e.g., ORIS codes), which are subject to change, once assigned to a unit, the CAMD Database Unit ID does not change. Used primarily for internal tracking purposes at EPA. ——— The National Electric Energy Data System (NEEDS) is the database of existing and planned-committed units which are modeled in the EPA Base Case v.5.13. Units that are currently operational in the electric industry are termed as “existing” units. Units that are not currently operating but are firmly anticipated to be operational in the future, and have either broken ground (initiated construction) or secured financing are termed “planned-committed”.

NEEDS is maintained in spreadsheet format. Below is a guide to the fields found in NEEDS.Page 2 PlantType G The type of electric generating unit, usually defined by the "prime mover" and/or fuels burned. "Prime mover" refers to the machine (e.g., engine, turbine, water wheel) that drives an electric generator or the device that converts energy to electricity directly (e.g., photovoltaic solar and fuel cell(s)). Biomass Coal Steam Combined Cycle Combustion Turbine Fossil Waste Fuel Cell Geothermal Hydro IGCC Landfill Gas Municipal Solid Waste Non-Fossil Waste Nuclear O/G Steam Pumped Storage Solar Tires Wind

Combustion Turbine/IC Engine H Clarifies the engine type for units with “Combustion Turbine” plant type. An Internal Combustion (IC) Engine is a reciprocating engine which uses pistons toextract energy from a fluid to perform work. A Combustion Turbine is a standalone turbine combusting fuel to drive a generator (a combined cycle less the Heat Recovery Steam Generator (HRSG)). Combustion Turbine IC Engine

Region Name I The region, used in the EPA Base Case v.5.13 using the Integrated Planning Model (IPM), where the generating unit is located. IPM regions are defined to enable IPM to accurately represent the operation and structure of U.S. and Canada electric power system. IPM regions are generally subdivisions of the 8 North American Electric Reliability Council (NERC) regions and aggregations of the electricity grid's contiguous control areas. See Appendix or Figure 3-1 and Table 3-1 of the IPM Documentation for a map and description of the IPM regions

State Name J

——— State Code K

——— County L

——— County Code M

——— FIPS5 N

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Capacity (MW) O The net summer dependable capacity (in megawatts) of the unit available for generation for sale to the grid. Net summer dependable capacity is the maximum capacity that the unit can sustain over the summer peak demand period reduced by the capacity required for station services or auxiliary equipment. ———

Heat Rate (Btu/kWh) P The net heat input (in Btu) required to generate 1 kilowatt hour of electricity. It is a measure of a generating unit’s efficiency. See Section 3.8 in the Documentation for EPA Base Case v.5.13 Using the Integrated Planning Model for more details ———

On Line Year Q The year in which the unit is commissioned.

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Retirement Year R The year in which the unit is to be decommissioned. ("9999" indicates that the unit has not been retired.) ——— These five fields identify the geographic location of the unit. The State Code is the FIPS State Code, and the County Code is the FIPS County Code. New units have blanks in these columns, while committed units have zeros for county codes. Federal information processing standards (FIPS) codes are a standardized set of numeric or alphabetic codes issued by the National Institute of Standards and Technology (NIST) to ensure uniform identification of geographic entities through all federal government agencies.Page 3 Firing S This field, which applies only to boilers, indicates the burner type and configuration (e.g., cell, cyclone, FBC (fluidized bed combustion), stoker/SPR, tangential, or vertical). A blank appears in instances where the firing characteristics of a boiler are unknown or the unit is a not a boiler. Cell: boilers that combine 2-3 standard burners into a compact, vertical assembly installed on the furnace wall; multiple cells utilized within a furnace. Cyclone: A special type of burner for coals with low fusion point ashes. Combustion occurs within the horizontal burner generating high temps which turn the ash into molten slag. The term "wet bottom" furnace often accompanies the cyclone burner. FBC: “fluidized bed combustion” where solid fuels are suspended on upward-blowing jets of air, resulting in a turbulent mixing of gas and solids and a tumbling action which provides especially effective chemical reactions and heat transfer during the combustion process. Stoker/SPR: stoker boilers where lump coal is fed continuously onto a moving grate or chain which moves the coal into the combustion zone in which air is drawn through the grate and ignition takes place. The carbon gradually burns off, leaving ash which drops off at the end into a receptacle, from which it is removed for disposal. Tangential (also referred to as "corner firing"): burners located along furnace corners in multiples of 4. Burner angle is off-set working conjunction with the opposing corner burner to create a vertical, circular swirling combustion zone within the furnace. Turbo (wall fired burner): Burner design for pet coke and low volatile bituminous coals (Riley trademark name: "Turbo Furnace"). Hour glass shaped furnace with rectangular shaped burners angled downwards. Vertical: standard furnace (assume wall fired) Wall: standard burner / furnace design used today. Circular burners located on the front and rear furnace walls at multiple elevations.

Bottom T This field, which applies only to boilers, indicates whether the bottom of the combustion chamber is "wet" (i.e., ash is removed from the furnace in a molten state) or "dry" (i.e., the boiler has a furnace bottom temperature below the ash melting point and the bottom ash is removed as a solid). A blank appears in instances where the bottom characteristics of a boiler were not known or the unit was not a boiler. Dry Wet

Cogen? U This field indicates whether a unit is a cogenerator. A unit is considered a cogenerator if it produces electricity and another form of useful thermal energy (such as heat or steam), used for industrial, commercial, heating, or cooling purposes. Y (Yes) N (No)Page 4 Modeled Fuels V The fuels that can be combusted or used by the unit. Biomass Bituminous Distillate Fuel Oil Fossil Waste Geothermal Hydro Landfill Gas Lignite MSW Natural Gas Non-Fossil Waste Nuclear Fuel Petroleum Coke Pumped Storage Residual Fuel Oil Solar Subbituminous Tires Waste Coal Wind

Wet/DryScrubber W This field indicates if a unit has an SO2 scrubber, and, if so, whether it is a wet or dry scrubber. Also known as flue gas desulfurization (FGD) systems, SO2 scrubbers use chemical and physical absorption to remove SO2 from the flue gas. Wet scrubbers use a liquid sorbent to remove SO2 and the flue gas leaving the absorber is moisture saturated. With dry scrubbers the flue gas leaving the absorber is not saturated. For circulating fluidized bed units (as shown in the "Firing" field), this field indicates whether reagent injection is used for SO2 control. Reagent injection involves adding finely crushed limestone to the fluidized bed. During combustion, the limestone is reduced to lime, the sulfur in the fuel is oxidized to form SO2, and, in the presence of excess oxygen, the SO2 reacts with the lime particles to form calcium sulfate, which can be removed with the bottom ash or collected with the fly ash by a downstream particulate matter (PM) control device. Dry Scrubber Wet Scrubber Reagent Injection

Scrubber_Online_Year X The first year of operation of an existing or committed SO 2scrubber

——— Scrubber Efficiency Y The removal efficiency of the SO 2scrubber.

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Scrubber Efficiency_MATS Z The removal efficiency of the SO2 scrubber assuming an upgrade to preexisting scrubbers that do not meet the MATS HCl removal requirement, assuming this is the most cost effective approach for meeting the limit ———Page 5 NOx Comb Control AA This field indicates the NO Xcombustion controls employed by a generating unit. Combustion controls reduce NO Xemissions during the combustion process generally by regulating flame characteristics such as temperature and fuel-air mixing. AAAdvanced Overfire Air BFBiased Firing (alternate burners) BOOSBurners-Out-Of-Service CM Combustion Modification/Fuel Reburning CO Combustion Optimization DLNB Dry Low NOx Burners FR Flue Gas Recirculation FU Fuel Reburning H2O Water Injection LALow Excess Air LN Low NOx Burner LNB Low NOx Burner Technology (Dry Bottom only) LNBO Low NOx Burner Technology w/ Overfire Air LNC1 Low NOx Burner Technology w/ Closed-coupled OFA LNC2 Low NOx Burner Technology w/ Separated OFA LNC3Low NOx Burner Technology w/ Closed-coupled/Separated OFA LNCB Low NOx Cell Burner LNFLow NOx Furnace MR Methane Reburn N2 Nitrogen NDI Nitrogen Diluent Injection NGR Natural Gas Reburn NH3Ammonia Injection OFAOverfire Air O therOther ROFARotating Overfire Air SC Slagging SOFAStationary Overfire Air STC Staged Combustion

NOx Post-Comb Control AB This column indicates the post-combustion NO Xemission controls at a generating unit. There are two NO Xpost-combustion control options: SelectiveCatalytic Reduction (SCR) or Selective Non-Catalytic Reduction (SNCR). Postcombustion controls operate downstream of the combustion process and remove NOx emissions from the flue gas. SCR Selective Catalytic Reduction SNCR Selective Noncatalytic Reduction

SCR_Online_Year AC The first year of operation of an existing or committed SCR

——— SNCR_Online_Year AD The first year of operation of an existing or committed SNCR

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PM Control AE This field indicates the presence of particulate matter (PM) controls B Baghouse C Cyclone ESPH Hot side electrostatic precipitator ESPC Cold side electrostatic precipitator WSWet PM Scrubber

PM Control_MATS AF This field indicates existing PM controls and, if necessary, exogenously determined control upgrades to comply with filterable PM limits. These upgrade may be one of 3 ESP upgrades or a fabric filter. See Section 5.6 of the Documentation for EPA Base Case v.5.13 Using the Integrated Planning Model

——— FlueGasConditioning_Flag AG Indicates if the unit has flue gas conditioning

———Page 6 Mercury_Controls AH Dedicated Mercury emission controls in existence at a generating unit ACI (Activated Carbon Injection) ACI_Online_Year AI The first year of operation of an existing or committed ACI

——— Mercury_Controls Efficiency_MATS AJ The removal efficiency of the mercury control device.

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SO2 Permit Rate (lbs/mmBtu) AK The SO 2emission rate (in lb/mmBtu) limit that applies to the unit due to federal, state or local emission regulations. ———

Mode 1 NOx Rate (lbs/mmBtu) AL The four NOx rates in NEEDS allow modeling of any conceivable scenario involving NOX controls. Mode 1 represents no post-combustion control operating; existing combustion controls. See Section 3.9.2 of the Documentation for EPA Base Case v.5.13 Using the Integrated Planning Model for more information on NOx Rates in NEEDS ———

Mode 2 NOx Rate (lbs/mmBtu) AM The four NOx rates in NEEDS allow modeling of any conceivable scenario involving NOX controls. Mode 2 represents post-combustion control operating, existing combustion controls. See Section 3.9.2 of the Documentation for EPA Base Case v.5.13 Using the Integrated Planning Model for more information on NOx Rates in NEEDS ———

Mode 3 NOx Rate (lbs/mmBtu) AN The four NOx rates in NEEDS allow modeling of any conceivable scenario involving NOX controls. Mode 3 represents No post-combustion control operating; state-of-the-art (SOA) combustion controls (where applicable). See Section 3.9.2 of the Documentation for EPA Base Case v.5.13 Using the Integrated Planning Model for more information on NOx Rates in NEEDS ———

Mode 4 NOx Rate (lbs/mmBtu) AO The four NOx rates in NEEDS allow modeling of any conceivable scenario involving NOX controls. Mode 4 represents Post-combustion control operating; state-of-the-art (SOA) combustion controls (where applicable). See Section 3.9.2 of the Documentation for EPA Base Case v.5.13 Using the Integrated Planning Model for more information on NOx Rates in NEEDS ———

Hg EMF for BIT_MATS AP Mercury Emission Modification Factor (EMF) when the unit combusts bituminous coal. “Mercury EMF” is defined as the percentage of fuel mercury left after accounting for the mercury removal obtained by the SO2, NOx, and particulate controls. ———

Hg EMF for SUB_MATS AQ Mercury Emission Modification Factor (EMF) when the unit combusts subbituminous coal. ———
Hg EMF for LIG_MATS AR Mercury Emission Modification Factor (EMF) when the unit combusts lignite coal. ———

HCL Removal AS Indicates the HCl removal efficiency based upon the existing HCL controls such as SO2 scrubber and DSI. ———

HCL Removal_MATS AT The HCL removal efficiency of the SO2 scrubber assuming an upgrade to preexisting scrubbers that do not meet the MATS HCl removal requirement, assuming this is the most cost effective approach for meeting the limit ———

DSI Unit AU Flag indicating if the unit has dry sorbent injection (DSI)

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BART Affected Unit AV Flag indicating if the unit is subject to Best Available Retrofit Technology (BART) requirements ———APPENDIXPage 7NERC Assessment Region AEO 2013 NEMS Region Model Region Model Region Description ERC_FRNT ERCOT_Tenaska Frontier Generating Station ERC_GWAY ERCOT_Tenaska Gateway Generating Station ERC_REST ERCOT_Rest ERC_WEST ERCOT_West FRCC FRCC (2) FRCC FRCC MAP_WAUE MAPP_WAUE MIS_MAPP MISO_MT, SD, ND MROE (3), RFCW (11) MIS_WUMS MISO_Wisconsin- Upper Michigan (WUMS) MIS_IA MISO_Iowa MIS_MIDA MISO_Iowa-MidAmerican MIS_MNWI MISO_Minnesota and Western Wisconsin RFCM (10) MIS_LMI MISO_Lower Michigan RFCW (11), SRCE (15) MIS_INKY MISO_Indiana (including parts of Kentucky) MIS_IL MISO_Illinois MIS_MO MISO_Missouri NENG_CT ISONE_Connecticut NENG_ME ISONE_Maine NENGREST ISONE_MA, VT, NH, RI (Rest of ISO New England) NYCW (6) NY_Z_J NY_Zone J (NYC) NYLI (7) NY_Z_K NY_Zone K (LI) NY_Z_A&B NY_Zones A&B NY_Z_C&E NY_Zone C&E

NY_Z_D NY_Zones D NY_Z_F NY_Zone F (Capital) NY_Z_G-I NY_Zone G-I (Downstate NY) PJM_EMAC PJM_EMAAC PJM_PENE PJM_PENELEC PJM_SMAC PJM_SWMAAC PJM_WMAC PJM_Western MAAC

PJM_AP PJM_AP PJM_ATSI PJM_ATSI PJM_COMD PJM_ComEd PJM_West PJM West SRVC (16) PJM_Dom PJM_Dominion SERC-E SRVC (16) S_VACA SERC_VACAR S_C_KY SERC_Central_Kentucky S_C_TVA SERC_Central_TVA SERC SE SRSE (14) S SOU SERC S th t SERC-N SRCE (15)

PJM RFCE (9) MROW (4)

SRGW (13)

RFCW (11) ISO-NE Table 3-1 Mapping of NERC Assessment Regions and NEMS Regions with EPA Base Case v.5.13 Model Regions

NEWE (5)

NYISO NYUP (8) ERCOT ERCT (1)

MAPP MROW (4)

MISO

Page 8 SERC-SE SRSE (14) S_SOU SERC_Southeastern S_D_AMSO SERC_Delta_Amite South (including DSG) S_D_N_AR SERC_Delta_Northern Arkansas (including AECI) S_D_REST SERC_Delta_Rest of Delta (Central Arkansas) S_D_WOTA SERC_Delta_WOTAB (including Western) MROW (4) SPP_NEBR SPP Nebraska SPNO (17), SRGW (13) SPP_N SPP North- (Kansas, Missouri) SPP_KIAM SPP_Kiamichi Energy Facility SPP_SE SPP Southeast (Louisiana) SPP_SPS SPP SPS (Texas Panhandle) SPSO (18), SRDA (12) SPP_WEST SPP West (Oklahoma, Arkansas, Louisiana) WECC_ID WECC_Idaho WECC_NNV WECC_Northern Nevada WECC_UT WECC_Utah WEC_CALN WECC_Northern California (including SMUD) WECC_SF WECC_San Francisco AZNM (19) WECC_IID WECC_Imperial Irrigation District (IID) WEC_LADW WECC_LADWP WEC_SDGE WECC_San Diego Gas and Electric WECC_SCE WECC_Southern California Edison WECC_MT WECC_Montana WECC_PNW WECC_Pacific Northwest NWPP (21), RMPA (22) WECC_WY WECC_Wyoming RMPA (22) WECC_CO WECC_Colorado WECC_AZ WECC_Arizona WECC_NM WECC_New Mexico WECC_SNV WECC_Southern Nevada

CN_AB Alberta CN_BC British Columbia CN_MB Manitoba CN_NB New Brunswick CN_NF Newfoundland CN_NL Labrador CN_NS Nova Scotia CN_ON Ontario CN_PE Prince Edward Island CN_PQ Quebec CN_SK Saskatchewan Canada Northwest (NORW) NWPP (21)

Rockies (Rock)

Desert Southwest (DSW) AZNM (19) Basin (BASN) NWPP (21)

Northern California (CALN) CAMX (20)

Southern California (CALS) CAMX (20) SERC-W SRDA (12)

SPP SPSO (18)

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