Renewable Generation Interconnection Ken Brunkenhoefer Distributed Generation Consultant...

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Renewable Generation Interconnection Ken Brunkenhoefer Distributed Generation Consultant [email protected]

Transcript of Renewable Generation Interconnection Ken Brunkenhoefer Distributed Generation Consultant...

Renewable Generation Interconnection

Ken BrunkenhoeferDistributed Generation [email protected]

Oncor Electric Delivery’s goal is to insurethe safe and reliable interconnection of distributed resources that connect in parallel to the distribution system.

Renewable interconnection process requirements are subject to changing rules and regulations. Potential impacts from multiple facility interconnections or other impact concerns could cause process changes to occur without notice (check periodically for process changes).

Disclaimer !

The PUCT in Project 22318 adopted requirements for pre-certification of DG equipment by a NRTL including labeling requirements indicating compliance with §25.211 and §25.212. Pre-certification, as described in this requirement, was never initiated by any market participant. As a result, Oncor Electric Delivery recognizes UL 1741 utility-interactive certified inverters as meeting the intent of the PUCT pre-certification rules and accepts them as being pre-certified. However, Oncor Electric Delivery does not require UL 1741 certification for inverter based systems.

Interconnections Utilizing Inverter Based Technology

The Energy Policy Act of 2005 defines Net Metering Service. “Net Metering Service means service to an electric consumer under which electric energy generated by that electric consumer from an eligible on-site generating facility and delivered to the local distribution facilities may be used to offset electric energy provided by the electric utility to the electric consumer during an applicable billing period.” This definition could imply that net metering is accomplished by the use of a single meter which spins forward and backwards allowing offsets. The use of multi-channel metering normally implies that consumption is valued at retail and exporting energy is valued at wholesale pricing. With this assumption “offsets” are not one for one.

Customer InformationCustomer’s of Oncor are provided information giving a general explanation of: 1) how a customer can be paid for exported energy; 2) the process to request Net Metering. Customers are told that if they want to be paid for excess energy ERCOT market model rules apply and their REP needs to specify the type of metering (multi-channel, etc.). This information should be specified in the customers interconnection application.

PUCT rules require that all distributed resources that electrically operate in parallel with the distribution system of the utility must compete and submit an Application for Interconnection with the local distribution utility. (§25.211 and §25.212)

PUCT Interconnection Rules--Utility Notification--

•Receive and review completed application, one-line diagram and layout sketch

•Verify pre-certification to UL-1741 Utility Interactive

•Obtain REP concurrence for Net Metering requests

•Verify facility metering for Net Metering requests

•Prepare and secure Interconnection Agreement

Basic Steps for Inverter Based Interconnections requesting Net Metering:

Basic Steps for Non-Inverter UL-1741 Based Interconnections

Interconnection requests which are not precertified under UL-1741- Utility Interactive must follow the standard interconnection rules described in the Public Utility Commission’s Substantive Rule §25.211 and §25.212.

Renewable Interconnection Requests

1) Completed Application2) One-line diagram3) Layout sketch

Control Strategy - 59N Relay

Inverter

Utility

Visible disconnect in close proximity to meter

Not a breaker

PV panels or Wind Turbine

General Loads

Utility Meter

Inverter Based One-Line Diagram Example

MainService Panel

UtilityVisibleLockableDisc.

UtilitySource

Utility Meter

Customer Main BreakerPanel

Visible lockable (labeled)Disconnect

Fence

PV Panels

Sample Layout Sketch

Within~10 feet

Comments:1) Layout sketch is to show the relationship between the meter and visible disconnect. The goal is to have the visible disconnect located within 10 feet from the meter or within visible sight and in a readily accessible location.2) The visible lockable disconnect switch is not a breaker. These switches have a visible air gap for a utility lineman to verify the alternate source of power is “open” and should be labeled something like Alternate Power Source Disconnect.

Address:Account #:

Negative Meter Readings

Oncor customers with REP approved Net Metering have the capability for negative end-of-month meter readings. If end-of-month meter readings are negative (meaning more was exported to the grid than was consumed from the grid) then the monthly consumption reading will be set to zero. Annualized or multi-month net metering is not available meaning that you cannot "bank" excess production in one month and apply it to the consumption of another month.

Private bilateral energy transactions

Scheduling Entities

Balanced schedules of loads and resources; and information and transactions required to support reliability.

Retail Customers

ERCOT Bilateral Market

Load Serving Entities

ERCOT

Resources

Electricity sellers Electricity buyers

Deregulation Model

DG sales into the market

TDSPs are prohibited from buying or selling energy in the market

ResourcePower

Marketer

(Optional)

Load

Serving

Entity

(LSE)

Aggregator

(Optional)

Custom

ers

Transmission and Distribution Service Provider (TDSP)

ER

CO

T

Qualified Scheduling Entity (QSE)

NOIEs (Municipality/Cooperative)

LegendKey Information Flow

Power Flow

Non - Regulated Organization

Regulated Organization

Public Utility Commission of Texas (PUCT)

ERCOT Competitive Market Participants

ERCOT Market Model

Questions?