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Distributed Generation

SWEDE 2006

CenterPoint Energy

Walter R. Bartel, P.E.Supervising Engineer

Distribution System Reliability

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The Rules

• Public Utility Commission of Texas Substantive Rules:

– PUC Rule 25.211 General Description– PUC Rule 25.212 Technical Requirements

• Size Range: up to 10 MW

• Voltage Range: 120 Volts to 34,500 Volts

• Generator Types: Solar Panels, Wind Turbines, Fuel Cells, Micro-Turbines, Reciprocating Engines, Turbines

• Generator Fuels: Gas, Solar, Wind, Diesel, Bio-Diesel

• Intended Use: Net Metered or Export

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The Process

• DG equipment is reviewed for technical compliance.

• Studies are performed to determine CNP system impacts.

• CNP system modifications are developed (w/estimates).

• DG provides payment for CNP system modifications.

• CNP completes modifications while DG installs equipment.

• DG site inspections/approvals are performed.

• DG signs interconnection agreement and is allowed to operate.

• DG performance and addresses issues as necessary.

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Existing DG Facilities on CNP System

FUEL TECHNOLOGY DG'sCAPACITY

(KW)LARGE

(KW)SMALL

(KW)

           

DIESEL ENGINE 5 10,250 3,000 250

GAS ENGINE 7 24,810 7,470 140

LANDFILL GAS

ENGINE 3 17,584 9,984 3,800

GAS FUEL CELL 3 570 200 170

GAS MICROTURBINE 1 210 210 210

SOLAR PV 5 68.5 44 1

SOLAR, WIND

PV, INVERTER 1 3 3 3

WIND WIND 3 52 40 1.8

           

 SYSTEM TOTALS

28 53,547.3    

V16 ENGINE BURNS LANDFILL GAS1600 KW GENERATOR

5,000 KW GENERATORAND TURBINE

BOILERMAKES STEAM

250 KW FUEL CELL

170 KW DG at oil field Burns waste natural gas to power oil pumps

1 KW SOLAR PANELS

MICRO DG INSTALLATION

50 KW SOLAR PANELS

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Questions