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Variable generation is on track to become a significant contributor to electric power systems worldwide. Thus, it is important to analyze the effect that renewables will have on the reliability of systems. In this paper we present a new tool being implemented at the National Renewable Energy Laboratory, which allows the inclusion of variable generation in the power system resource adequacy. The tool is used to quantify a first estimate of the potential contribution of transmission to reliability in highly interconnected systems and an example is provided using the Western Interconnection footprint.

Evaluating the capacity value of renewable energy sources can pose significant challenges due to their variable and uncertain nature. In this paper the capacity value of solar power is investigated. Solar capacity value metrics and their associated calculation methodologies are reviewed and several solar capacity studies are summarized. The differences between wind and solar power are examined, the economic importance of solar capacity value is discussed and other assessments and recommendations are presented.

Large amounts of wind and/or solar energy will have an impact on bulk electricity markets. This panel presentation will provide insight to how scheduling and dispatch rules can help to efficiently integrate wind and solar generation. Possible proxies for wind and solar capacity values that may be useful in capacity markets are also discussed.

The ever increasing level of wind power penetration in Spain has a remarkable impact on power system operation and costs. Furthermore, the Iberian Peninsula Power System is considered to be a weak systems. With a weak interconnections, wind power fluctuations could affect the security, reliability and stability of power system. There are times when a combination of several events or several actions taken (coincidence or coordinated) may lead to the worst condition of power system. An evolution of procedures and regulations related to power system have been performed and developed by Spanish Transmission System Operator (TSO) to tackle these extreme events; thus, improving the overall wind power integration. This paper analyzes the wind power events and the evolution of procedures during past several years implemented by Spanish TSO. Events are analyzed from TSO perspective as well as from the wind farm and wind turbines point aspects. Operational decisions and techniques developed and performed by Spanish TSO to resolve these events are also described in this paper.

The development of large amounts of wind and/or solar energy will have an impact on bulk electricity markets. These variable generation sources increase the level of variability and uncertainty that the power system operator must manage. In this paper we discuss the impact that electricity markets have on the wind producer, using examples from the Nordic system. We also describe two market structures that will help induce both the needed flexibility, whether from generation or load, and sufficient capacity. We also provide some general guidelines for market design and simple tests that can help identify how a proposed market would function. We close with suggestions for future research.