gentypes

gentypes()
gentypes() - Return list of standard values for generator unit types.
GT = GENTYPES()

Returns a cell array of strings containing the following standard
two character generator unit types for use in the optional MPC.GENTYPE
field of the MATPOWER case struct. This is to be considered an unordered
list, where the position of a particular fuel type in the list is not
defined and is therefore subject to change.

From Form EIA-860 Instructions, Table 2. Prime Mover Codes and Descriptions
https://www.eia.gov/survey/form/eia_860/instructions.pdf
    BA  - Energy Storage, Battery
    CE  - Energy Storage, Compressed Air
    CP  - Energy Storage, Concentrated Solar Power
    FW  - Energy Storage, Flywheel
    PS  - Hydraulic Turbine, Reversible (pumped storage)
    ES  - Energy Storage, Other
    ST  - Steam Turbine, including nuclear, geothermal and solar steam
            (does not include combined cycle)
    GT  - Combustion (Gas) Turbine (includes jet engine design)
    IC  - Internal Combustion Engine (diesel, piston, reciprocating)
    CA  - Combined Cycle Steam Part
    CT  - Combined Cycle Combustion Turbine Part
            (type of coal or solid must be reported as energy source
            for integrated coal gasification)
    CS  - Combined Cycle Single Shaft
            (combustion turbine and steam turbine share a single generator)
    CC  - Combined Cycle Total Unit
            (use only for plants/generators that are in planning stage,
            for which specific generator details cannot be provided)
    HA  - Hydrokinetic, Axial Flow Turbine
    HB  - Hydrokinetic, Wave Buoy
    HK  - Hydrokinetic, Other
    HY  - Hydroelectric Turbine (includes turbines associated with
            delivery of water by pipeline)
    BT  - Turbines Used in a Binary Cycle
            (including those used for geothermal applications)
    PV  - Photovoltaic
    WT  - Wind Turbine, Onshore
    WS  - Wind Turbine, Offshore
    FC  - Fuel Cell
    OT  - Other
Additional codes (some from PowerWorld)
    UN  - Unknown
    JE  - Jet Engine
    NB  - ST - Boiling Water Nuclear Reactor
    NG  - ST - Graphite Nuclear Reactor
    NH  - ST - High Temperature Gas Nuclear Reactor
    NP  - ST - Pressurized Water Nuclear Reactor
    IT  - Internal Combustion Turbo Charged
    SC  - Synchronous Condenser
    DC  - represents DC ties
    MP  - Motor/Pump
    W1  - Wind Turbine, Type 1
    W2  - Wind Turbine, Type 2
    W3  - Wind Turbine, Type 3
    W4  - Wind Turbine, Type 4
    SV  - Static Var Compensator
    DL  - Dispatchable Load

Example:
    if ~ismember(mpc.gentype{k}, gentypes())
        error('unknown generator unit type');
    end