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Renewable & Alternative Power

The Southern California Edison (SCE) Renewable Auction Mechanism (RAM) program is open to all RPS eligible technologies not less than 3 MW and not greater than 20 MW and interconnected within any of the service territories of SCE, Pacific Gas & Electric or San Diego Gas & Electric. This program contributes to SCE’s compliance with California’s goals for renewable energy procurement. The program follows the requirements established by the California Public Utilities Commission (CPUC).

On March 29, 2012 SCE filed advice letter 2712-E with the California Public Utilities Commission (CPUC), submitting contracts resulting from the first RAM Solicitation (RAM 1) for CPUC approval. The advice letter contains public information about the procurement, and also contains the independent evaluator’s report. SCE has posted the advice letter on the RFO website in the Documents folder.

On October 1, 2012 SCE filed advice letter 2785-E with the California Public Utilities Commission (CPUC), submitting contracts resulting from the second RAM Solicitation (RAM 2) for CPUC approval. The advice letter contains public information about the procurement, and also contains the independent evaluator’s report. SCE has posted the advice letter on the RAM 2 RFO website in the Documents folder.

On May 1, 2013 SCE filed advice letter 2894-E with the California Public Utilities Commission (CPUC), submitting contracts resulting from the third RAM Solicitation (RAM 3) for CPUC approval. The advice letter contains public information about the procurement, and also contains the independent evaluator’s report. SCE has posted the advice letter on the RAM 3 RFO website in the Documents folder.

On May 17, 2013, SCE announced the launch of the fourth RAM RFO (RAM 4). The RAM RFO will be conducted using the RFO website provided by Accion Group, the independent evaluator for the RAM 4 RFO. Please visit the RFO website for more information, to submit an Offer, or to ask a question.

SCE Interconnection Map

Southern California Edison’s Interconnection Map provides SCE system data pertinent to Distributed Generation (DG) developers searching for possible interconnection locations on the SCE distribution system. This set of maps includes the locations of SCE distribution circuits, substations, subtransmission systems, and areas of transmission constraints along with the associated circuit/substation/system voltage, available capacity, and current and queued DG interconnections amounts.

Typically, projects less than 10MW can be connected to SCE’s distribution system. The SCE Distribution layer, in conjunction with the SCE Substation, SCE Subtransmission, and SCE Transmission layers (explained below) provides information so developers can make choices in siting their generation projects.

The SCE Distribution layer contains locations of SCE distribution circuits. This layer includes green and red circuits containing the following data:

  • ID Number: The SCE assigned circuit ID#
  • Preferred/Not Preferred status: Based on initial screening studies, each distribution circuit is classified as “Preferred” and “Not Preferred” for DG interconnection.
    • “Preferred” distribution circuits, rendered in green, are high load density areas on the SCE distribution system that currently have low DG penetration levels (less than 2.0MW). Locating a project inside one of the identified areas could potentially minimize the developer’s costs of interconnection to the SCE system. Locating projects on “Preferred” circuits up to the identified “Available Capacity” will in most cases be processed under Fast Track.
    • “Not Preferred” distribution circuits, rendered in red, are low load density areas and/or are areas with high DG penetration levels. SCE does not prohibit interconnection to the SCE system in these areas, but locating a project in one of these red regions has the potential to increase the developer’s costs of interconnection to the SCE system and will likely be no be processes under Fast Track.
    • Proposing generation projects on distribution circuits (red or green) which are within the “SCE Transmission Constraints Layer” or which are within red “SCE Subtransmission Areas” may need significant studies to determine the interconnection requirements.
  • Voltage: The voltage of the distribution circuit.
  • Allocated Generation: The amount of generation currently interconnected to that specific distribution circuit.
  • Queued Generation: The amount of generation requested to interconnect to that specific distribution circuit in the future.
  • Max Available Capacity: The “Maximum Available Capacity” shown for distribution circuits indicates the maximum amount of generation that can interconnect to that specific distribution circuit. This assumes that sufficient system upgrades are in place, insufficient system conditions may result in high interconnection costs for the developer. The “Max Available Capacity” value accounts for all allocated and queued generation on that distribution circuit.
  • Available Capacity: The “Available Capacity” shown for distribution circuits is the amount of generation that can interconnect to that specific distribution circuit that will likely have minimal impact to the system if no subtransmission or transmission constraints exist. The “Available Capacity” value accounts for all allocated and queued generation on that distribution circuit. Locating a project in a “Preferred” region with enough “Available Capacity” increases the project’s potential for Fast Track eligibility (but does not guarantee Fast Track eligibility) and has the potential to minimize the developer’s interconnection costs to the SCE system.

The SCE Substation layer contains general locations of SCE distribution substations. This layer includes blue squares containing the following data:

  • ID Number: SCE assigned substation ID
  • Voltage: The voltage(s) of the distribution substation.
  • Allocated Generation: The amount of generation currently interconnected to that distribution substation.
  • Queued Generation: The amount of generation requested to interconnect in the future.
  • Max Available Capacity: The “Maximum Available Capacity” shown at the substation level indicates the maximum amount of generation that can interconnect to that specific distribution substation. This value also assumes that sufficient system upgrades are in place, insufficient system conditions may result in high interconnection costs for the developer. The “Max Available Capacity” value accounts for all allocated and queued generation on the specific circuits served from that substation.

The SCE Subtransmission layer contains general locations of the SCE Subtransmission systems. This layer contains red and green regions containing the following data:

  • ID: An internal ID for SCE use only
  • Preferred/Not Preferred status: Based on initial screening studies, each subtransmission system is classified as “Preferred” and “Not Preferred” for DG interconnection.
    • "Preferred” subtransmission systems, rendered in green, are high load density areas on the SCE distribution system that currently have low DG penetration levels. Locating a project inside one of the identified areas could potentially minimize the developer’s costs of interconnection to the SCE system.
    • “Not Preferred” distribution circuits, rendered in red, are low load density areas and/or areas with high DG penetration levels. SCE does not prohibit interconnection in these areas, but locating a project in one of these red regions has the potential to increase the developer’s costs of interconnection to the SCE system.
  • Voltage: The voltage of the subtransmission system.
  • Allocated Generation: The amount of generation currently interconnected to that specific subtransmission system.
  • Queued Generation: The amount of generation requested to interconnect in the future.
  • Max Available Capacity: The “Max Available Capacity” shown for the subtransmission systems indicates the maximum amount of generation that can interconnect in a specific subtransmission system. This assumes that sufficient system upgrades are in place, insufficient system conditions may result in high interconnection costs for the developer. The “Max Available Capacity” value accounts for all allocated and queued generation on the specific circuits served from that subtransmission system.

The SCE Transmission layer contains “Red” areas where Transmission constraints exist. Interconnection within these areas may necessitate transmission level upgrades, which will increase the developer’s interconnection costs to the SCE system.The transmission system facilities are under CAISO Control and would likely need technical studies subject to FERC Generation Interconnection Procedures.

Note: Actual interconnection costs and Fast Track eligibility will be determined from further studies which consider specific project location, size, and application date relative to other projects in the same vicinity.

To view the subtransmission, substation, and distribution circuit interconnection map, download this KMZ file and open it in Google Earth. NOTE: In order to improve loading time, all layers of the interconnection map have been disabled by default. Please enable the layers you want to see after the map opens. Also, please note that you will need to install Google Earth to view the map.

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All inquiries regarding the RAM RFO must be posted on RAM RFO website. SCE representatives will post responses to participants’ questions on the RAM RFO website.