Transcript Distributive Generation

Distributive Generation
Landfill
Wind
Micro-Turbine
Fuel Cell
Solar
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CPS Energy Generation
272.6, 5%
1000, 17%
3021, 53%
1425, 25%
Coal (MW)
Gas (MW)
Nuclear (MW)
Wind/DG (MW)
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Major Issues and Trends
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Texas has net metering law in place since 1986 for renewables only.
On Feb 4 1999, the Public Utility Commission of Texas adopted interconnection
guidelines for distributed generation and requested that staff continue its investigation
of distributed resources
The costs of interconnection with CPS Energy can get expensive. System upgrades
are borne by the Customer, such as service line and/or meter facilities, conductor,
communications, SCADA equipment, etc. required for the interconnection.
High Voltage readings at interconnection point
Micro turbine and Fuel Cell projects have shown to be too expensive to maintain
Solar – estimated payback is 20yrs
Trends
Landfills receive over 5,100 Tons of garbage daily, with decomposition in about 5-6
yrs. Covel location expected to double its generating capacity.
Wind continues to be a dominant source of renewable DG, with another 130 MW
coming on-line.
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Volume of Requests
Requests have been minimal
– 3 Landfill Projects
• Tessman Garden (4.8MW)
• Covel Garden (9.6MW)
• Nelson Garden (3.0MW)
– 1 Fuel Cell
– 1 Micro turbine (80kW)
– 4 Solar (private customer, Institute of Texan Culture & CPS Energy –
40kW)
– Wind (260MW)
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Overall Process
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The electrical generation equipment must be powered by renewable energy
sources:
– The sun (directly or indirectly)
– Wind
– Geothermal sources
– Biomass and/or biomass-based waste products (including landfill gas)
Customers interested in DG must fill out an application.
CPS Energy issues a study fee to applicant
CPS Energy determines if circuit upgrades are needed (if so, upgrade costs
are added to Agreement)
Application is approved and agreement is submitted to Applicant
After Agreement is signed by applicant, upgrades to distribution circuit are
performed, including communications, SCADA, protective relaying, & metering
Once Commissioning Tests are conducted, DG is approved for operation
CPS Energy will ensure that the required DG safety devices are operating
properly. These devices provide safety to our personnel who are performing
maintenance on distribution facilities. All customer equipment -- up to the
service point -- will be inspected by the City of San Antonio to ensure
compliance with City of San Antonio codes.
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Unusual Installations
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San Antonio Water Systems (SAWS) proposing a DG project at a sewer
treatment plant. Fuel source – Methane Gas
Fuel Refinery – proposing a 10MW DG project. Fuel source - a product of
hydrogen that would be combined with LP gas
Engine Testing Laboratory – various size engines (lawnmower to diesel
trucks) that when attached to a generator, the load generated by the engine
is dumped onto the distribution grid
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Landfill Gas Projects
Covel Garden Landfill
6 – 1.3 MW Units
9.6 MW Total
Nelson Garden Landfill
2 – 1.5 MW Units
3.0 MW Total
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What’s Next?
Landfill
Wind
Micro-Turbine
Fuel Cell
Solar
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