1 Distributed Generation SWEDE 2006 CenterPoint Energy Walter R. Bartel, P.E. Supervising Engineer Distribution System Reliability

2 The Rules Public Utility Commission of Texas Substantive Rules: –PUC Rule General Description –PUC Rule 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

3 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.

4 Existing DG Facilities on CNP System FUELTECHNOLOGYDG'sCAPACITY (KW) LARGE (KW) SMALL (KW) DIESELENGINE510,2503, GASENGINE724,8107, LANDFILL GAS ENGINE317,5849,9843,800 GASFUEL CELL GASMICROTURBINE1210 SOLARPV SOLAR, WIND PV, INVERTER1333 WIND SYSTEM TOTALS 2853,547.3

V16 ENGINE BURNS LANDFILL GAS 1600 KW GENERATOR

5,000 KW GENERATOR AND TURBINE BOILER MAKES 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

12 Questions