DG Update

Has DG (distributed generation) gone quiet, or mainstream, or both?  Meanwhile, the DOE program has not done well in the proposed budget.  Congressional earmarks are taking up so much money that DOE is forced to cancel some ongoing DG applications projects.

 Here are some developments and updates.

 – DUIT Facility Up and Running 
 – CADER Meeting  Jan. 2004
 – IEEE 1547 Interconnection Standards
 – PG&E DG Interconnection program


Distributed Utility Integration Test Facility

The Distributed Utility Integration Test (DUIT) is the first full-scale, integration test of commercial-grade, utility grid interactive Distributed Energy Resources (DER) in the U.S.  DUIT addresses a key technical issue: electrical implications of operating multiple, diverse DERs at high penetration levels within a utility distribution system.  DUIT’s test plan is intended to focus on grid interaction, integration and aggregation issues, not on DER technology itself. 

After an exhaustive study of program goals and alternative sites, DOE selected the facilities at PG&E’s Modular Generation Test Facility in San Ramon, CA as the home of the new DUIT Facility.  Pre existing buildings, labs and professional staff helped make the choice, along with the adjacent test substation and high-current yard.  The site held an official opening ceremony in August 2003.

The facility offers a realistic yet controlled laboratory environment, enabling  testing of normal and abnormal operational conditions without interfering with a customer’s electric service. DG equipment at the site is commercially available and all on loan to the project from the vendors:  Inverters, rotating machinery, and generation and storage devices. DUIT provides a full-scale multi-megawatt implementation, testing and demonstration of distributed generation technologies in a realistic utility installation.

Utilities may want to take note that DUIT will be confirming and testing to the newly passed IEEE 1547 Interconnection standard, which is expected to be adopted by a large number of state regulators and legislators. Similarly, for California, DUIT will  be testing to the Rule 21 document.

To inquire about prospective DUIT project participation, technical specifications, test plans, project plans or the DUIT white paper, contact the DUIT Project Team.  Reports will be issued by CEC and other sponsors beginning this Summer, and information will be available on the DUIT website:

Susan Horgan, DUIT Project Leader
    Distributed Utility Associates
     925-447-0625      susan@dua1.com

For the complete history:
"DUIT: Distributed Utility Integration Test", NREL/SR-560-34389, August 2003 (250 pages)


CADER (California Alliance for Distributed Energy Resources)

The 2004 DG conference in San Diego on January 26-28, 2004 had 202 attendees.

Presentations are posted on CADER’s website at  www.cader.org or go directly to:

The draft DG-DER Cost and Benefit Primer was developed as a first step to support the discussions at the "Costs and Benefits of DER" session at the Conference on January 26-28, 2004. Comments about the document can be provided via the CADER member list-server to reach all members.


IEEE 1547 Update

As you know, "IEEE 1547 Standard for Interconnecting Distributed Resources with Electric Power Systems" was approved by the IEEE Standards Board in June 2003. It was approved as an American National Standard in October 2003. (available for purchase from IEEE:      http://standards.ieee.org

SCC21 develops and coordinates new IEEE standards and maintains existing standards developed under past SCC21 projects. These include the original 1547, along with the four spinoff efforts.

> P1547.1 Conformance Test Procedures for Equipment Interconnecting Distributed Resources with Electric Power Systems (EPS)  (draft standard)

> P1547.2 Draft Application Guide for the IEEE 1547 Standard

> P1547.3 Monitoring, Information Exchange, and Control of Distributed Resources Interconnected with EPS (draft guide)

> P1547.4 Design, Operation, and Integration of Distributed Resource Island Systems with EPS  (draft guide)

#1 and 2 have drafts out to their working groups for review.  #1 expects to be ready for ballot early in 2005.
#3 has just completed a draft.
#4 has just been approved as a new initiative, and will be organized over the coming summer.

Complete information is available at:

The next meeting of the IEEE 1547 series working groups will be April 20-22, 2004 in San Francisco. The P1547.1, P1547.2, and P1547.3 working groups will meet concurrently 8 a.m. to 5 p.m. each day. Working groups will be meeting separately – no plenary session is planned.  Details at:


PG&E DG Interconnection program

PG&E held a Distributed Generation (DG) Workshop last December 10. The free event provided PG&E customers and the DG community with practical information on how to navigate the various Electric Rule 21 application and interconnection review processes – from initial application through to permission to parallel with PG&E’s electric distribution system. The focus of the workshop was to communicate PG&E’s internal DG processes and interconnection technical requirements to the DG community. (For details on California’s Rule 21, see:

PG&E has set up an entire cross-company team to deal with all aspects of DG interconnection in a coordinated way.  They appear to be very committed to low hassle, low cost, minimum time for DG projects. A great deal of information about PG&E’s program, (including the 117 page powerpoint from the workshop) is available at: http://www.pge.com/gen

Jerry Jackson, Team Leader
415-973-3655   GRJ4@pge.com

PS- Jerry’s office generously offers to send a hard copy on request of the nearly 2 inch thick binder that was handed out at the workshop.

       ———CALIFORNIA RULE 21 ——-
CPUC:  http://www.cpuc.ca.gov/static/industry/electric/distributed+generation/index.htm
CEC:    http://www.energy.ca.gov/distgen/index.html

After passing Rule 21 in Dec 2000, California PUC established, and the CEC coordinated, a working group of all DG stakeholders. Electric Rule 21 Working Group meetings have been held about once a month since mid 2001.  The purpose is to establish procedures and work through issues to simplify and expedite interconnection projects.  (Agenda and minutes are at:

  California Interconnection Guidebook
  Publication # 500-03-083F
  PDF file, 94 pages, 1.1 megabytes) online November 13, 2003.

The Guidebook is intended to help a person or project team interconnect one or more electricity generators to the local electric utility grid in California under California Rule 21. Rule 21 applies only to the three electric utilities in California that are under jurisdiction of the California PUC: PG&E, SCE, and SDG&E. The Guidebook is written as an aid to interconnection in these utility areas. It may also be useful for interconnection in some municipal utility areas with interconnection rules resembling Rule 21, principally Riverside, SMUD, and the LADWP.


Recommended:   DG Monitor, a free email newsletter from Resource Dynamics Corp. Archive and subscription at:

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