HomeMy WebLinkAbout2025-09-19 IMC Agenda and docs INTERTIE MANAGEMENT COMMITTEE (IMC) REGULAR MEETING
September 19, 2025
9:00 am
Alaska Energy Authority Board Room 813 W Northern Lights Blvd, Anchorage, AK 99503 To participate dial 1-888-585-9008 and use code 212-753-619#
1. CALL TO ORDER
2. ROLL CALL FOR COMMITTEE MEMBERS
3. PUBLIC ROLL CALL
4. AGENDA APPROVAL
5. PUBLIC COMMENTS
6. APPROVAL OF PRIOR MINUTES – July 25, 2025
7. NEW BUSINESS - None
8. OLD BUSINESS
A. 616 Structure Update
B. Snow Load Resiliency and Synchrophasor Grants Update
9. COMMITTEE REPORTS
A. Audit Update Mark Ziesmer
B. IOC Report Mike Miller
C. Operator Report Mike Miller
10. EXECUTIVE SESSION - (Bylaws Section 5.11.3 (d)) To discuss confidential legal
matters which by law are required to be confidential.
11. MEMBERS COMMENTS
12. NEXT MEETING DATE – December 5, 2025 at 9:00 am
13. ADJOURNMENT
813 W Northern Lights Blvd, Anchorage, AK 99503 Phone: (907) 771-3000 Fax: (907) 771-3044 Email: info@akenergyauthority.org
REDUCING THE COST OF ENERGY IN ALASKA AKENERGYAUTHORITY.ORG
MEMORANDUM
TO: Alaska Intertie Management Committee THROUGH: Curtis W. Thayer, Executive Director FROM: Mark Ziesmer, Owned Assets Project Controller DATE: September 15, 2025
SUBJECT: Audit update
FY 25 Budget vs Actual and Surplus
There have been no notable updates since the draft presented at the July 25, 2025 IMC Meeting. At that time, the budget versus actual indicated a projected surplus of approximately $1.1
million, and I do not expect any material changes to that amount.
FY25 AEA Audit
My current focus is on completing tasks for AEA’s FY25 audit, which follows a defined timeline.
Bradley Lake and Alaska Intertie-related work represents a significant portion of the AEA audit.
The FY25 audit is progressing as expected, and AEA Finance remains on schedule to have the
audited financial statements presented to the AEA Board on October 30, 2025.
FY26 Budget vs Actual
There were no expenses to report by the submission deadline for this meeting. The next update
will be provided at the upcoming IMC meeting scheduled for December 5, 2025.
Intertie Management Committee Meeting
IOC Report
September 19, 2025
1. Intertie Operating Committee
a. Repairs to structure 616 are complete.
b. The Committee discussed generator tuning coordination across the Railbelt utilities.
GVEA volunteered to initiate a working group outside of the IOC to discuss opportunities
to jointly study the interactions of generation assets throughout the Railbelt and
coordinate tuning efforts.
c. The Committee clarified a request for IMC direction on infrastructure upgrades for the
Alaska Intertie (metering, CTs, calibration), asking whether to act proactively or wait for
formal direction. (Concerning anticipated regulation by RRC)
2. System Studies Subcommittee
a. Preliminary results are under review by the SSS for an impact study that focuses on
upgrading the Kenai to Anchorage and Anchorage to Healy transmission lines to 230 kV.
The original scope of work has been studied and they have begun analysis including a
second parallel intertie circuit as requested in a previous change order. Those findings
are anticipated for October.
b. The SSS has commissioned a study to analyze the impact of a high penetration of
inverter base resources on the Railbelt. Telos is still working on the dynamics portion of
the study. They submitted preliminary results at the end of August.
c. Grant funding for the Synchrophasor and snow unloading projects are currently waiting
on grant agreements and cost sharing agreements review and signature by each
participating utility.
d. GVEA is creating an RFP for a Railbelt EMT model. The intent is to release an RFP and
gather bids in time to evaluate including this project in the FY27 Budget. That work is
ongoing.
3. Relay, Protection, & Control Subcommittee
a. The committee plans to review and determine what is needed to provide GVEA remote
access to Douglas after the Douglas control enclosure foundation repair is completed.
4. SCADA/Telecommunications Subcommittee
a. Paul Johnson initiated contact to schedule a kickoff meeting for IMC-assigned
communications improvements; no further updates yet.
5. Operations, Maintenance, and Scheduling Subcommittee
a. No updates
Intertie Management Committee Meeting
Operator Report
September 19, 2025
1. Alaska Intertie usage report
a. MWh usage – Measured at Douglas Substation, YTD
GVEA MEA Total
July – August FY25 18,429 4,609 23,038
July – August FY26 5,602 6,112 11,714
Delta – FY26 to FY 25 (-69.6%) (+35.6%) (-49.2%)
2. Alaska Intertie trips to report
There were no trips of the Alaska Intertie in the months of July or August.
3. IOC Quarterly Reliability Report
For generation trips or transmission line trips where the loss of load is known, the Railbelt-wide
frequency response is calculated. The magnitude of the tripped power and the change in frequency
from the pre-trip value to the peak or nadir are used to calculate the MW/0.1Hz value often known as
‘Beta’. Chugach has calculated the Beta for several events and the table of the results is provided below.
Events without data for the MW magnitude of the trip were excluded, as were events that did not cause
a frequency deviation greater than 0.2 Hz.
Event Date Time MW Pre-Trip High /Low Freq Resp
Tripped Freq (Hz) Freq (Hz)
(MW/0.1Hz)
GVEA 138kV
Trip 7/6/25 19:21:50 N/A 59.97 60.47 N/A
Healy 2 Trip 7/20/25 05:16:00 37.2 59.99 59.56 8.7
Aurora Trip 8/4/25 11:43:54 20.1 60.01 59.70 6.4
Healy 2 Trip 8/26/25 16:24:30 24.1 60.04 59.74 7.9
Aurora Trip 8/26/25 22:32:25 19.5 60.00 59.76 8.3