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Please provide all information demonstrating whether there is a history or pattern of extended natural gas shortages for power plants in the ISO-NE local zone, how long those shortages typically last, the likelihood that fuel oil will be needed to ru

RESPONSE 16-4:

 

An analysis of all duel fuel units was done in the ISO-NE, and it was observed that in general gas shortages typically occurred during cold temperatures where residential and commercial heating demand peaked. In the last five years, only 2014 and 2015 saw impactful natural gas shortages where duel fuel units burned fuel oil. Based on 23 plants observed in this area:

  • On average, the shortages typically lasted 0.71 days, with the largest consecutive outage lasting on average 2.03 days.
  • The average plant saw 1 instance where a natural gas shortage lasted longer than 3.65 days. Sixteen plants never experienced a shortage that lasted longer than 3.65 days and seven plants observed a shortage that lasted longer than 3.65 days.
  • The plants that saw these longer durations were not located on the main pipeline.

 

 

RESPONDENT:

 

John Niland, Invenergy Thermal Development LLC

DATE:

August 25, 2016