IEEE Power & Energy Magazine - November/December 2014 - 25

The experience of the 2013-2014 winter exposed
some potentially serious challenges related to
gas-electric integration.

cooperation with gas sector providers throughout the region in
order to develop more robust communications and gas demand
forecasting models.

Lessons Learned and the Electric/Gas
Operations Committee
The New England gas-electric nexus in the year 2000
was nearly nonexistent, at least from an operational planning perspective. Most of New England's electricity at that
time was generated by a combination of nuclear, coal, oil,
and hydroelectric resources. Small nonutility generation or
special qualifying facilities also accounted for a relatively
small portion of total summer capacity. A few of these units
were older combined-cycle facilities or gas turbines located
directly off the interstate pipeline system. In addition, there
were some oil-fired steam generators that were dual-fuelcapable units, burning either heavy or light oil while cofiring
with gas. As a result of this limited operational intersection,
ISO-NE had only a limited knowledge of the regional natural gas system, and there was very little contact or communication between the regional gas sector representatives and
industry groups.
That changed shortly after the severe cold snap of 14-16
January 2004, which alerted ISO-NE to operational awareness gaps. By that time, gas-fired generation capacity in
New England had begun to increase, and initial planning
studies had identified early signs of gas supply constraints
that stress-tested the bulk electric system. In response to the
challenges of that period, ISO-NE and the Northeast Gas
Association cofounded the Electric/Gas Operations Committee (EGOC) to improve cross-sector awareness and to
discuss common issues, such as maintenance schedules, preand postseasonal assessments, and training opportunities.
The EGOC typically meets quarterly and is open to representatives from regional pipelines, LDCs, LNG and liquid
fuel suppliers, other regional ISOs and RTOs, regulatory
bodies, and industry associations.

Operational Changes
In 2013, ISO-NE implemented changes in how it plans and
schedules its generation resources. It moved the day-ahead
market (DAM) schedule timelines to accommodate longlead-time generating resources and modified its resource
adequacy assessment (RAA) process to better align with
the natural gas evening nomination and confirmation cycles
(see Figure 6). It also subscribed to a number of gas sector
november/december 2014

services to improve fuel price forecasts and overall situational awareness of the gas sector. These included Platts Gas
Daily (for national and regional gas sector news and prices),
Genscape gas pipeline flow information (used to execute
nomination reports for the current and future gas day), and
the Intercontinental Gas Exchange, used for next- and intraday bid and ask gas pricing information.

Improvements in the Forecast Department
In 2013, ISO-NE expanded its forecasting department to
improve information sharing and gas sector coordination.
In addition, ISO-NE developed new tools for scheduling and operational planning of gas-fired resources and
increased coordination with the gas control centers of all
the regional pipelines.
The Forecast Department assesses the DAM results and
prepares information for delivery to each of the five gas pipelines serving the region. This process consists of computing
hourly gas consumption by applying unit-specific heat rates,
combining the hourly gas consumption for each unit on the
same pipeline, and subsequently transmitting both unit-specific and combined-fuel consumption to each pipeline. If there
are any perceived issues with the reliable delivery of the next
day's fuel requirements, the Forecast Department contacts the
gas control department of each pipeline to verify whether the
electric sector fuel consumption can be accommodated (in
addition to the core gas sector deliveries) and, based on those
discussions, may choose to revise or supplement the next-day
operating plan.
Gas Users Tool

ISO-NE's Forecast Office uses its Gas Users Tool to improve
estimates of gas pipeline capacity and identify any potential
shortfalls or overages. Developed internally by the ISO-NE
Operations Support Team, the Gas Users Tool scrapes the five
electronic bulletin boards (EBBs) of the interstate gas pipelines serving New England and aggregates scheduled deliveries of gas for each gas LDC (citygate meters), all regional
commercial and industrial loads, and all nonelectric sector
delivery points. It then estimates the remaining gas pipeline
capacity by individual pipe for use by the electric power sector
and overlays the daily, 14-h (10 a.m.-midnight) burn profiles
of all gas-fired generators by pipeline to see if the electric sector demand can be accommodated. The Forecast Office can
then identify any potential underscheduling of gas and modify
the next-day operating plan if warranted.
ieee power & energy magazine

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Table of Contents for the Digital Edition of IEEE Power & Energy Magazine - November/December 2014

IEEE Power & Energy Magazine - November/December 2014 - Cover1
IEEE Power & Energy Magazine - November/December 2014 - Cover2
IEEE Power & Energy Magazine - November/December 2014 - 1
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IEEE Power & Energy Magazine - November/December 2014 - Cover3
IEEE Power & Energy Magazine - November/December 2014 - Cover4
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