Investor Presentaiton
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21
Transmission System Update
.
Electric Transmission:
•
•
Continue planned retirements of generating resources
in Montana in conjunction with increasing demand is
placing more stress on the transmission system
(two record peaks in the last three seasons). As a result,
we are experiencing less available transmission capacity
throughout the system.
Continued investment is critical to address aging
infrastructure, capacity concerns, reliability and
compliance requirements.
Gas Transmission:
Continued investment is critical to address aging
infrastructure, capacity concerns, reliability and
compliance (including the Pipeline and Hazardous
Materials Safety Administration proposed rules).
• Three primary factors leading to the need for
additional investment to address:
·
•
Overall reliability and capacity on the gas transmission system to
withstand single large contingencies and to address the decline in on-
system gas production;
The need to provide additional capacity for existing gas-fired electric
generation (given expected growing dependence); and
The need to serve new gas-fired capacity generation in South Dakota.
Significant investment
needs identified for
transmission reliability,
capacity and gas/electric
interdependence.
NorthWestern
Energy
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