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Solar Plant Forecasting Data for Improved Generation Production

ISO proposes to require forecasting data for solar plants to support power production forecasting. This includes static data such as plant location and dynamic data like wind speed and irradiance. Solar resources will be required to provide the same range of information as wind resources.

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Solar Plant Forecasting Data for Improved Generation Production

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  1. February 20, 2019 | Transmission committee Bill Henson & Jaren Lutenegger (413) 540-4716 | whenson@iso-ne.com (860) 683-3302 | jlutenegger@iso-ne.com Solar Plant Forecasting Data

  2. Due to increases in solar photovoltaic plant interconnections, ISO is proposing to require forecasting related data for these facilities • Order No. 764 requires that this data be included in the pro-forma Large Generator Interconnection Agreement • The wind resource data requirements serve as the starting point for the solar requirements • A draft Operating Procedure Appendix (OP-14H) has also been created by using the wind related Appendix (OP-14F) as a starting point • This new Appendix will be discussed with the Reliability Committee starting at its March 20, 2019 meeting

  3. BackgroundOrder No. 764 Summary • On June 22, 2012, the Federal Energy Regulatory Commission (“Commission”) issued a Final Rule amending the pro forma Open Access Transmission Tariff (“OATT”) to remove barriers to the integration of variable energy resources (“VERs”) into the transmission system by requiring each public utility transmission provider to: • (1) offer intra-hourly transmission scheduling; and • (2) incorporate provisions into the pro forma Large Generator Interconnection Agreement (“LGIA”) requiring interconnection customers whose generating facilities are VERs to provide transmission owners with meteorological and operational data to support power production forecasting

  4. BackgroundOrder No. 764 Compliance • On November 12, 2013, in Docket No. ER14-375-001, the ISO, joined by NEPOOL, filed modifications to the LGIA to comply with the requirements of Order No. 764 • With respect to the requirement that VERs provide meteorological and operational data, the ISO’s proposed language incorporated by reference the provisions of Appendix F to Operating Procedure No. 14 (OP-14), which already included these requirements for wind resources • This filing also explained how the existing New England market design construct was consistent-with or superior-to the direction to offer intra-hourly transmission scheduling • In a March 20, 2014 order, FERC rejected the approach to cross-reference the ISO New England Operating Documents in the LGIA • FERC ordered the ISO to place the requirements that already existed in Appendix F to OP-14 in the LGIA

  5. BackgroundOrder No. 764 Compliance (continued) • In compliance with FERC’s directive in the March 20, 2014 Order, the ISO submitted a second compliance filing on April 21, 2014, in which it added provisions in the LGIA to require Interconnection Customers whose generating facilities are wind resources to provide meteorological and operational data to support power production forecasting • Solar resources were not included in the ISO’s compliance filing for Order No. 764 because, at the time of that filing, ISO-NE did not engage in power production forecasting for solar resources • The Commission accepted the ISO’s compliance filing in a letter order dated July 9, 2014

  6. Solar Data is Needed • The ISO now engages in power production forecasting for solar resources • In furtherance of the goals of Order No. 764, data is needed to facilitate the continued addition of solar resources • New England is experiencing the addition of a significant number of larger solar facilities. As of 2/1/19: • Online: Eight solar plants total to approximately 130 MW (nameplate) • In the public queue (out to 2020): 120 solar plants totaling > 3,500 MW (nameplate) • Site specific data will support improvedforecasting of Real-Time generation production • Solar resources will be required to provide the same range of information that is currently required of wind resources • Two main categories: static data and dynamic data

  7. Include Solar Resources in the LGIA Requirements • The ISO will propose to add provisions to the pro forma Large Generator Interconnection Agreement (“LGIA”) to require that Interconnection Customers whose generating facilities are solar resources provide meteorological and operational data to support power production forecasting

  8. Solar Static Plant Data Requirements • Static data: • Plant location, elevation, polygon • Do panels track the sun? • Azimuth and tilt (as applicable) • High/Low temperature operation • High wind speed operation (as applicable) • Inverter sizes/specifications • PV module specifications • Nameplate DC • Nameplate AC • Similar to wind resources an Excel spreadsheet has been created to facilitate data entry for the solar static data requirements

  9. Solar Real-Time Data Requirements • Dynamic data – via telemetry • Wind speed • Temperature • Humidity • Irradiance • Pressure • Solar high limit • (max the plant could be generating given the Real-Time irradiance) • Real-Time high operating limit • (Real-Time nameplate minus outages)

  10. Solar Outage Coordination – similar to those of Wind • Solar Plant Future Availability will be required when the web-services interface is developed • Solar Plants shall submit daily outages in advance to perform routine maintenance work, which in many cases may have no effect on their overall MW capability. Therefore: • All Solar Plants must submit Solar Plant Future Availability to the System Operator. • If the Solar Plant does not have a Capacity Supply Obligation in accordance with Market Rule 1, Section III of the Tariff, and is not a Qualified Generator Reactive Resource, only Solar Plant Future Availability must be reported to the System Operator. • Any Solar Plant that does have a Capacity Supply Obligation in accordance with Market Rule 1, Section III of the Tariff, or that is a Qualified Generator Reactive Resource, must report Solar Plant Future Availability, and also submit an outage request to the System Operator only when the outage will derate the plant to the point that the available nameplate is less than its Capacity Supply Obligation and/or Qualified VARs.

  11. Companion OP-14 Appendix H • A draft Operating Procedure Appendix (OP-14H) has been created by using the wind related Appendix (OP-14F) as a starting point • Contains additional implementation details • Will be presented to and discussed with the Reliability Committee

  12. Conclusion • Due to increases in solar photovoltaic plant interconnections, ISO is proposing to include data requirements for solar resources in the Tariff • Order No. 764 requires that this forecasting data requirements be included in the pro-forma LGIA • The wind resource data requirements serve as the starting point for the solar requirements both in the Tariff and the new Appendix H to OP-14 • The proposed effective date for both the proposed Tariff revisions and new OP-14H is mid-July 2019

  13. Stakeholder Schedule

  14. Bill Henson (413) 540-4716 | whenson@iso-ne.com

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