Integrated Resource Plan

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The Imperial Irrigation District’s Energy Department collaborated and prepared the Integrated Resource Plan for 2019-30. The goal of the document is to address the requirements of the IRP guidelines under Senate Bill 350. It also provides the Energy Department with an integrated approach to identifying the generation and power system resources needed to sustain IID’s overall mission to continue as a fiscally responsible public agency providing reliable, efficient and affordably priced water and energy service to the communities it serves.
More specifically, the objectives for the document are to provide information regarding:

  • The best mix of resources, compliance with renewable portfolio standards laws and emissions laws included the renewable portfolio changes of Senate Bill 350, operational flexibility and effectiveness in renewables integration
  • A development of IID’s overall resources optimization plan, complete with an IID overall expansion plan that includes:
    • Current and future generation assets
    • Load serving or export
    • All Energy Department commodity trading activities
    • Local renewable resource development
    • Transmission
    • Customer service projects
    • A flexible framework of future operational and planning activities in compliance with the Energy Policy Act (EPACT) of 1992 and Western Area Power Authority (WAPA) IRP requirements
    • An assurance of NERC compliance

While the objective of the IRP is to accomplish the goals outlined above, IID does not hold this IRP as a binding “law,” or as an absolute strategy, that foresees the unknown future environment. IID will continuously update the IRP as the changing environment of legislation, regulation, IID system status, opportunities and overall organizational conditions evolve. In balancing these objectives for this IRP, all IID activities are driven by four key organizational principles:

  1. Protecting and maintaining the IID Balancing Authority
  2. Sustaining system reliability throughout the IID service area
  3. Expecting environmental and regulatory responsibility
  4. Providing competitive rates to its retail, commercial and industrial customers

As a result of the IRP activities that include in-depth analysis and studies, the Energy Department recommends the following:

  • IID needs to closely monitor the regulations, rules and guidelines issued to implement SB 350 as well as the recently passed SB 100 that have been released/adopted to date and will continue to be released/adopted.
  • Issue a request for proposals for 30 megawatts of energy storage to be located in the northern territory of the IID system. This will allow IID to operate more efficiently and cost effectively and provide much needed reliability benefits to the northern territory.
  • No sooner than 2028, the IID should enter into power supply agreements for an additional 10-15 MW of baseload renewable generation and 300-350 MW of solar generation with in-service dates of 2028-2030 to help meet renewables standards under SB 350 as well as the recently passed SB 100 and reduce greenhouse gas emissions.
  • Over the 20-year planning horizon, IID should keep conventional generation commissioned as long as possible. These generation facilities offer much needed capacity, flexible generation, ancillary services and system resources.
  • Conservation, energy efficiency and demand-side management activities should continue to increase in accordance with SB 350 standards to reduce IID’s need for resources that are expected to be used for less than 200 hours per year.
  • IID should continue planning to meet greenhouse gas emission reduction legislation of reducing emissions by 40 percent below 1990 levels by 2030 and 80 percent below 1990 levels by 2050.
  • IID should further investigate the option of self-managing a ‘build and own’ structure for a solar plant and other generation facility technologies on IID owned land as opposed to paying a developer to manage the project development.
  • The request for proposal process helps the developer understand what IID needs and it increases competition among the developers and thus, lowers the price and provides a sound negotiating structure for both IID and the developer.
  • IID is long in the winter and short in the summer. To avoid operational issues of excessive power over certain hours of the year, IID needs to explore seasonally based resources.
  • IID’s hedging program should continue in the gas and energy markets under the Energy Risk Policy. Meanwhile, a program for emissions trading and renewable energy products should be developed under the Energy Risk Policy also.
  • IID should become a participant in the NG-IV2 project to provide additional access to markets and additional reliability stability to the IID system.
  • With the district’s recently acquired increase of understanding of the CAISO markets and with the surplus of capacity and energy during the winter months of November through April, IID could take advantage of marketing the ancillary services of this surplus and further reduce the impact of meeting RPS/AB32 laws.
  • IID needs to further explore the addition of flexible resources in IID’s northern system in the next five years as well as repowering of El Centro #4 and the addition of energy storage when more solar is consumed to be in service between 2021 or 2025.
  • IID needs to create an electric vehicle program available to IID customers, particularly, to disadvantaged communities, if the program targets these areas.
  • IID must closely monitor the water agreement with the Coachella Valley Water District and how that may impact all future decisions, which would significantly reduce the electric load as well as drastically change the manner in which load is served.
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2018 IRP [PDF]

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