The California Solar Initiative's RD&D Program has now concluded after operating since 2008 through 2016. All solicitations and research projects are now complete.



 Program overview + Research briefs       

 [25 MB ]
 Program overview  [13 MB ]

 Research briefs  (high resolution)                     

 [44 MB ]

For more information on the research projects and resulting reports please review the section below. All completed final reports are also available separately for review and download. 

FINAL REPORTS for completed projects along with individual research briefs can be found here.


CSI RD&D Program - Program Evaluation 



 Report Summary       

 [277 KB ]
 Final Report  [3 MB ]


 [4 MB ]


Funded Projects

This is a database of projects funded by the CSI RD&D. The project summaries are listed alphabetically below. You may also choose a subset of projects by clicking a keyword, or using the search function.

Mitigation of Fast Solar Ramps through Sky Imager Solar Forecasting and Energy Storage Control

Current Highlights:
  • Final Project Report - July 2016.  PDF  (1 MB)
  • Project kick-off presentation 26 June 2014.  PDF  (1.5 MB)

Project Information

Solicitation: Solicitation 5
Target Area: Grid Integration
Awardee: University of California, San Diego

San Diego Gas and Electric

CSI Funding: $100,000
Match Funding: $35,000
Start Date: May 2014
End Date: May 2015
Status: Complete

Contact Information

Principal Investigator Name: Jan Kleissl
Principal Investigator Email: jkleissl @ ucsd.edu
Principal Investigator Phone: 858-534-8087
Grant Manager Name: Smita Gupta
Grant Manager Email: smita.gupta @ itron.com
Grant Manager Phone: 509-891-3189

Project Summary

Energy storage can support the integration of solar energy into the electricity grid by mitigating the fluctuations in net load; however storage is still quite expensive. This project focuses on reducing the amount of energy storage needed per feeder by up to 50% while achieving the same ramp mitigation benefits. The UC San Diego team will integrate an inexpensive cloud speed sensor developed at UC San Diego, into the sky imager forecast system to scale imaging data with absolute position data resulting in the time evolution of changing cloud patterns. This cloud forecast and the ability to anticipate power changes is a key input into the model to determine battery state of charge and inverter throughput at each time step. The UC San Diego team will evaluate model optimizations to achieve the ramp fluctuation dampening with batteries half the size of those without forecasting.

The solar forecast and energy storage controller will be demonstrated in actual conditions at the UC San Diego Solar Energy Test bed. The system performance will be demonstrated during a summer and winter month.

Deliverables and Documents


  • Final Project Report: Forecasting and Storage Control to Mitigate Large Ramps. Hanna, R., Wang, G., Kurtz, B., and Kleissl, J.  UC San Diego.  July 2016. PDF (1 MB)

  • Development and Simulation of Battery Energy Storage and Inverter Control for PV Ramp Rate Smoothing (Subtask 3 Interim Report). Hanna, R., Gonatas, D., Murray, K., and Kleissl, J. UC San Diego. April 2016.  PDF (1 MB)

  • Mitigation of Fast Solar Ramps: Improving Sky Imager Solar Forecasting through Cloud Base Height Optimization (Subtask 2 Final). July 2015.  PDF  (2.25 MB)


  • Project kick-off presentation 26 June 2014.  PDF  (1.5 MB)

Project Activities

Project Links