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BEW
DPC provided transmission analysis on several wind sites and potential interconnections in New York. DPC conducted transmission analysis looking at the reliability of various interconnections and wind generation levels. The analysis was limited to transmission impacts only. Transient and stability analysis was conducted by BEW.
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California Energy Commission under the California Geothermal Energy Collaborative
There were several tasks within this project. The first was to support the goals of the CGEC as assignments are made. The second was to organize a transmission workshop to focus on the transmission issues to expand geothermal development. The third was to complete a transmission study to evaluate the proposed transmission interconnection alternatives and any new alternatives. The alternatives included the LADWP proposal, SDG&E Sun Path, Devers upgrade and others. The report is being reviewed by the CGEC and the CEC. The document number will be listed here when available.
Education and Monitoring RPS Process
The CGEC will work to educate itself on the California Public Utilities framework and the developing RPS Process. It will also monitor the RPS activities related to the 2004 RPS procurement bid solicitations.
Identify and Communicate Transmission Issues and Opportunities
The goal of this task is to address the transmission constraints hindering geothermal development in California. The Collaborative is to engage in the ongoing activities related to the full spectrum of transmission activities and policy considerations.
Identify and Communicate Geothermal Transmission Activities
The CGEC will become cognizant of the current transmission-related activities in California that pertain to geothermal resources and track these activities. The CGEC will provide a summary of these activities to all geothermal stakeholders.
Characterize Opportunities
The CGEC will characterize opportunities for the Geothermal Industry to provide input to Transmission Activities to promote future geothermal development. The CGEC will formulate recommendations and bring them to the attention of the CEC policy makers.
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California Energy Commission under a McNeil Technology Contract
In 2005, DPC finished a multi-year contract with McNeil Technologies on the development of the strategic value analysis of renewable technologies. DPC’s team on this project was PowerWorld Corporation and Anthony Engineering. We developed a methodology for determining the strategic value for locating renewable technologies close to transmission congestion zones. We worked with CEC and CDF staffs on the development of GIS mapping and the development of technical and economic potential for renewable resources. The resources covered were high and low wind speed turbines, residential and concentrated solar, geothermal, and biomass (urban fuel, wastewater treatment, landfill gas, dairy manure and forestry thinning).
We developed a state wide transmission power flow which tied to the substation and power plant locations in a GIS map. Transmission power flows were completed and projected transmission congestion areas were mapped using GIS. We next developed a series of GIS overlay maps that showed locations of renewables with respect to transmission congestion areas.
For each renewable location selected, DPC completed a full power flow analysis including contingency analysis to determine how much capacity could be added to the system without creating an increase in overload, the capacity that could be installed that reduces or eliminates the overload and any transmission upgrades that could be needed to deliver the capacity to load centers.
After completing the individual locational studies, DPC conducted a full integration of renewables for meeting the 20 percent target penetration using only in-state resources. The findings were presented to the CEC as part of the 2005 Integrated Energy Resource Policy.
The integration report can be found on the CEC website shown below.
http://www.energy.ca.gov/2005publications/CEC-100-2005-007/CEC-100-2005-007-CMF.PDF |
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California Energy Commission under a UC Davis Research Division
There were two projects under this contract. The first was a contract for DPC to be a CEC representative at the Imperial geothermal study group and the Tehachapi Wind Study Group. The second contract was the intermittency study of renewable resources. DPC and General Electric will be co-leaders.
There have been several studies completed by the Tehachapi Wind Study Group, Imperial Valley Geothermal Study Group and the CAISO on transmission impacts from renewable resources in specific areas. The Tehachapi study focused only on wind at Tehachapi while the Imperial Valley study focused on geothermal only. The CAISO considered only those two areas for its study. DPC was contracted to complete a transmission study where the focus was on the high penetrations at both areas and additional renewables to meet the twenty percent targets. DPC was to evaluate all proposed transmission alternatives and consider any new alternatives. The various transmission connections were evaluated using the Strategic Value Analysis (SVA) developed for the Energy Commission.
There were two studies. The first was the Tehachapi at 4,500 MW with and without LEAPS 500 MW pumped storage. The second was Tehachapi with Imperial Valley geothermal at 2,200 MW. These studies are currently being reviewed by the CEC. When available, the document numbers will be provided here.
The CEC contracted with Davis Power Consultants and General Electric Consulting on a Intermittent Analysis Project (IAP). The purpose of the project was to investigate the potential impacts on transmission and operations under high penetrations of intermittent resources such as wind and solar. Each consulting company had its own contract with the CEC and its own subcontractors.
The DPC contract was to develop the 2006, 2010 and 2020 power flow data sets, develop twenty percent and thirty-three renewable energy penetration scenarios and conduct intermittent impact analysis on the transmission grid. DPC had to develop an intermittent analysis methodology for analyzing transmission impacts from intermittent resources such as wind and solar. The standard transmission methodology of looking at one point in time over selected seasons does not work for resources that change hourly.
The conclusions reached are:
• The twenty-percent and thirty-three percent renewable energy targets can be met in 2010 and 2020 with in-state renewable resources if all the projected transmission upgrades are completed
• Even with extensive transmission upgrades, there will still be overloads under contingency analysis that will require additional upgrades, Remedial Action Schemes or other remedies.
• Intermittent resources will create time dependent overloads on the transmission system
• The power flow model must investigate intermittent resources over time dependent periods and various seasons.
DPC completed the IAP project and presented a short review on the transmission conclusions at a Energy Commission February workshop. The final report is still being reviewed by the Energy Commission. When completed, the report will be listed under the tab marked [CEC]. In the meantime, a short draft description is included. |
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City of Santa Clara (Silicon Valley Power)
DPC has been a consultant for Santa Clara for more then 16 years.
Among the projects that DPC completed were numerous ten year operating studies, Western contractual issues, resource adequacy, renewable technology penetration analysis, review of wind sites on owned property, staff training, power plant acquisitions, purchase power rep development/analysis, wind analysis, and power flow analysis.
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City of Shasta Lake
DPC has been a consultant for Shasta Lake for more then twelve years.
Among the projects completed by DPC were the scheduling and dispatching services evaluation, Western representation, monthly operational reporting, rate case development, cost of service rate analysis, annual and ten year power purchase forecasting, economic analysis, and renewable energy requirement.
For the rate model, DPC will be developing the user manual, debugging the model logic and updating the data base. DPC will assist in the completion of rate design,
DPC will also begin to assist in distribution planning for Shasta Lake. DPC will begin completing planning studies on load balancing, relay/ reclosure and fuse coordination, distribution expansion for new residential subdivisions and other distribution issues. |
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City of Weed
DPC assisted the City of Weed in evaluating proposed transmission service revisions by PacifiCorp. DPC met with PacifiCorp transmission staff to review transmission power flows and interconnection alternatives associated with the interconnections to the Weed Substation. The proposed transmission changes were to be completed in phases. PacifiCorp met with the Weed City Council and agreed to write a letter on the proposed phase-in of new transmission and a commitment to maintain service reliability as local industrial plants were expanding. The results were that all parties were satisfied with the transmission changes.
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HGP
DPC was retained by HGP to evaluate the transmission impacts and benefits of wind development in the Susanville area. The Lassen MUD was developing a renewable energy park in the general area. DPC obtained transmission data sets from PG&E and completed power flow analysis on various connection points within and outside of California. DPC attended meetings with LMUD and PG&E. A report was prepared and sent to PG&E for review. The project is still in negotiations.
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ITRON
DPC is a subcontractor to Itron on a CPUC Self-Generation Incentive Program that was submitted to PG&E. DPC will be evaluating the transmission benefits of the existing self generating facilities within California. We will be using the SVA to calculate the transmission benefits on reliability, line loadings and other factors. The project is to be completed in 2007. More information to follow.
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Other Projects
DPC is currently negotiating several other projects. Watch the website for more information.
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