Characterizing Opportunity Power in the California Independent System Operator (CAISO) in Years 2015-2017

Andrew A Chien. 8 October, 2018.
Communicated by Andrew Chien.


We analyze opportunity power, curtailment and negative-priced generation, in the California Independent System Operator (CAISO) for the period January 2015 to December 2017 with the objective of characterizing its growth to create insights that can inform strategies to both reduce occurrence and exploit the opportunity this power represents for productive use. Findings include: 1) Negative-priced renewable power is significant and growing, Day-ahead market (DAM) combined with real-time dispatch show this at 1.5 TWh in 2017, and RTD alone at 5 TWh in 2017. 2) Negative priced power is several times larger than curtailment. 3) Resource-hours of negative priced power exceeded 600 hours/year average per site (2017). 4) Spatially, negative-priced power is concentrated, 170GWh at a single generation. 5) Duty factors peak at 955/hours for a single resources, representing 11% of 24 hours, and ~33% of sunlight hours.

Original Document

The original document is available in PDF (uploaded 8 October, 2018 by Andrew Chien).

Additional Document Formats

The document is also available in PDF (uploaded 30 March, 2019 by Andrew Chien).

NOTE: The author warrants that these additional documents are identical with the originial to the extent permitted by the translation between the various formats. However, the webmaster has made no effort to verify this claim. If the authenticity of the document is an issue, please always refer to the "Original document." If you find significant alterations, please report to