By Chris O’Malley
ST. PAUL, Minn. — MISO staff will seek board approval in December for about 352 transmission projects totaling $2.4 billion in its 2015 Transmission Expansion Plan.
That’s virtually the same dollar amount as MTEP 14, but this year’s plan includes more baseline reliability projects and what could be the first competitively bid market efficiency project.
The largest of the projects in MTEP 15 is Entergy’s controversial $187 million Lake Charles, La., baseline reliability project to accommodate an industrial upswing in the gulf region. (See Entergy Out-of-Cycle Requests Win MISO Board OK.)
The market efficiency project ranks fifth in cost at an estimated $67 million to $72 million. MISO is considering three alternatives to relieve congestion in southern Indiana, with PJM as a potential partner. MISO Vice President for Transmission Jennifer Curran told the Board of Directors’ System Planning Committee last week that a request for proposals could be posted in January, with developer proposals due in July. (See Southern Indiana Transmission Project Keeps Morphing.)
Another significant portion of MTEP 15 is a bundle of 13 transmission upgrades identified in the voltage and local reliability study to reduce costs in MISO South. Estimated at $300 million, the projects should produce $498 million in 20-year net present value benefits by decreasing the need for uneconomic generation in load pockets such as Amite South and WOTAB, MISO executives told the board.
More Baseline Projects
While the total price tag for MTEP 15 is nearly identical to MTEP 14 — a coincidence, RTO officials said — the complexion of projects differs significantly. Proposed in MTEP 15 are 91 baseline reliability projects totaling $1.2 billion, compared to 50 projects totaling $177 million in 2014.
Projects driven by local needs are fewer in MTEP 15: 251 for a total of $1 billion versus 312 projects for $1.6 billion in MTEP 14.
The big difference was the inclusion in MTEP 14 of the $676 million 500-kV Great Northern transmission line, built in response to a long-term transmission service request from the Manitoba border to the Iron Range in Minnesota.
Interregional Planning
Curran also updated the board on the status of interregional planning efforts, which have shown mixed results.
She acknowledged that at least two of three potential MISO-SPP interregional projects earlier touted to offer $235 million in benefits are now “uncertain to unlikely.”
Curran said the two projects now look less attractive in part because of differences in how the two RTOs modeled the impact of the Environmental Protection Agency’s Mercury and Air Toxics Standards. MISO applied MATS retirement assumptions about SPP generation in the MISO model, but SPP did not have the same retirements show up in its model. (See 2 of 3 MISO-SPP Seams Projects Likely Doomed.)
“There are also differences in the amount and type of generation added, leading to a larger net addition of future generation in the interregional models when compared to the MISO regional models,” MISO spokesman Andy Schonert said. “The magnitude, type and location of these future units can lead to increased transfers and resulting differences in congestion levels at seams, which impacts the projected value associated with certain transmission projects.”
Potential interregional projects with PJM also were pared down.
In June, the RTOs narrowed the list of “quick hit” flowgate projects to two, from 39 in March. Among the survivors is the proposed resagging of the Northern Indiana Public Service Co. section of the Michigan City-La Porte 138-kV line.
The nearly $10 million in congestion relief for the finalists is a big reduction from the $408 million in potential congestion relief that the 39 projects initially identified could have brought. However, Curran told the board that MISO officials found that 22 of the flowgates had already been included in other planned or currently in-service projects.