STOCK TITAN
  1. Home
  2. Sec-filings
  3. OTTR
  4. [8-K] Otter Tail Corp Reports Material Event

Otter Tail (NASDAQ: OTTR) details 15-year generation and coal transition plan

Filing Impact
(High)
Filing Sentiment
(Neutral)
Form Type
8-K

Rhea-AI Filing Summary

Otter Tail Corporation, through its utility subsidiary Otter Tail Power Company, filed its 2026 Integrated Resource Plan with the Minnesota Public Utilities Commission. The preferred plan outlines how the utility expects to meet customer electricity needs over the next 15 years.

Key elements include a proposed 50-megawatt natural gas plant targeted for service in 2031 or 2032, and two 50-megawatt wind facilities planned for 2035 and 2040. The plan also incorporates previously approved projects such as the 50-megawatt Solway Solar project expected in 2026, the 295-megawatt Abercrombie Solar project expected in 2028, a 75-megawatt battery storage facility, and additional wind generation. Consistent with prior planning, the Minnesota share of the Coyote Station coal plant is slated to become an Available Maximum Emergency resource beginning June 1, 2026, with service to Minnesota customers from that plant ending as soon as feasible and no later than December 31, 2031.

Positive

  • None.

Negative

  • None.
Item 8.01 Other Events Other
Voluntary disclosure of events the company deems important to shareholders but not covered by other items.
Natural gas plant size 50 megawatts Preferred plan addition, expected in 2031 or 2032
Wind facility 1 size 50 megawatts Preferred plan addition, expected in 2035
Wind facility 2 size 50 megawatts Preferred plan addition, expected in 2040
Solway Solar capacity 50 megawatts Project expected to be placed into service in 2026
Abercrombie Solar capacity 295 megawatts Project expected to be placed into service in 2028
Battery storage facility size 75 megawatts Project reflected in the resource plan
Coyote Station AME date June 1, 2026 Minnesota share designated as Available Maximum Emergency resource
Latest Coyote Station end date December 31, 2031 No longer serving Minnesota customers from Coyote Station by this date
Integrated Resource Plan financial
"filed its 2026 Integrated Resource Plan (2026 IRP) with the Minnesota Public Utilities Commission"
An integrated resource plan is a utility’s long-term roadmap showing how it will meet future electricity needs using a mix of power sources, energy efficiency, demand reductions and storage while balancing cost, reliability and regulatory requirements. Like a household budget that plans income, bills and savings, the plan reveals expected investments, operating costs and risks, so investors use it to assess future capital spending, potential rate changes and long-term profitability.
Available Maximum Emergency (AME) resource technical
"designate the Minnesota share of the jointly-owned Coyote Station coal-fired plant as an Available Maximum Emergency (AME) resource"
battery storage facility technical
"which include –a 75-megawatt battery storage facility; and –additional wind generation facilities"
forward-looking statements regulatory
"Certain information discussed in this on is forward-looking information that involves risks, uncertainties and assumptions"
Forward-looking statements are predictions or plans that companies share about what they expect to happen in the future, like estimating sales or profits. They matter because they help investors understand a company's outlook, but since they are based on guesses and assumptions, they can sometimes be wrong.
See more from StockTitan in Google Search and AI answers. Adds StockTitan as a preferred source · opens Google
Add on Google
Understanding 8-K Material Events →
0001466593falseMinnesota0-5371327-038399500014665932026-05-152026-05-15

UNITED STATES
SECURITIES AND EXCHANGE COMMISSION
WASHINGTON, D.C. 20549
FORM 8-K
CURRENT REPORT
Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934
Date of report (Date of earliest event reported): May 15, 2026
OTTER TAIL CORPORATION
(Exact name of registrant as specified in its charter)
Minnesota
(State or other jurisdiction of incorporation or organization)
0-53713
(Commission File Number)
27-0383995
(I.R.S. Employer Identification No.)
215 South Cascade Street, P.O. Box 496, Fergus Falls, MN 56538-0496
(Address of principal executive offices, including zip code)
(866) 410-8780
(Registrant’s telephone number, including area code)
Not Applicable
(Former name or former address, if changed since last report)
Check the appropriate box below if the Form 8-K filing is intended to simultaneously satisfy the filing obligation of the registrant under any of the following provisions:
☐ Written communications pursuant to Rule 425 under the Securities Act (17 CFR 230.425)
☐ Soliciting material pursuant to Rule 14a-12 under the Exchange Act (17 CFR 240.14a-12)
☐ Pre-commencement communications pursuant to Rule 14d-2(b) under the Exchange Act (17 CFR 240.14d-2(b))
☐ Pre-commencement communications pursuant to Rule 13e-4(c) under the Exchange Act (17 CFR 240.13e-4(c))
Securities registered pursuant to Section 12(b) of the Securities Exchange Act of 1934:
Title of each classTrading Symbol(s)Name of each exchange on which registered
Common Shares, par value $5.00 per shareOTTRThe Nasdaq Stock Market LLC
Indicate by check mark whether the registrant is an emerging growth company as defined in Rule 405 of the Securities Act of 1933 or Rule 12b-2 of the Securities Exchange Act of 1934.
Emerging growth company ☐
If an emerging growth company, indicate by check mark if the registrant has elected not to use the extended transition period for complying with any new or revised financial accounting standards provided pursuant to Section 13(a) of the Exchange Act.  ☐


Item 8.01 Other Events
Integrated Resource Plan
On May 15, 2026, Otter Tail Power Company (OTP), a wholly owned subsidiary of Otter Tail Corporation, filed its 2026 Integrated Resource Plan (2026 IRP) with the Minnesota Public Utilities Commission (MPUC). The 2026 IRP includes OTP’s preferred plan for meeting customers’ anticipated capacity and energy needs over the next 15 years.
The major requests in OTP's preferred plan include:
–the addition of a 50-megawatt natural gas plant, expected to be placed into service in 2031 or 2032;
–the addition of a 50-megawatt wind generation facility, expected to be placed in service in 2035; and
–the addition of a 50-megawatt wind generation facility, expected to be placed in service in 2040.
The 2026 IRP also reflects projects currently in development or under construction following OTP’s previously approved resource plan, which include:
–our 50-megwatt Solway Solar project, which is expected to be placed into service in 2026;
–our 295-megwatt Abercrombie Solar project, which is expected to be placed into service in 2028;
–a 75-megawatt battery storage facility; and
–additional wind generation facilities.
Additionally, consistent with OTP’s previously approved resource plan, OTP is prepared to designate the Minnesota share of the jointly-owned Coyote Station coal-fired plant as an Available Maximum Emergency (AME) resource beginning June 1, 2026, and to no longer serve Minnesota customers with capacity or energy from Coyote Station as soon as feasible, but no later than December 31, 2031.
Forward-looking Statements
Certain information discussed in this Current Report on Form 8-K is forward-looking information that involves risks, uncertainties and assumptions. Such forward-looking statements, including our expectations regarding the regulatory proceedings, as well as assumptions and other statements are intended to be identified in this document by the words “anticipated,” “expected,” “plan,” “preferred,” “project,” and similar expressions. Actual results may vary materially. Forward-looking statements made herein, which may include statements regarding our plan to meet customers’ electricity needs, the type of generation resources selected, the timing of the additions, the financial and operational impact of the final outcome of the review as well as other assumptions and statements, involve known and unknown risks and uncertainties that may cause our actual plans or results to differ from our assumptions or expectations. Our risks are more fully described in our filings with the Securities and Exchange Commission, including our most recently filed Annual Report on Form 10-K, as updated in subsequently filed Quarterly Reports on Form 10-Q, as applicable. Forward-looking statements speak only as of the date they are made, and we expressly disclaim any obligation to update any forward-looking information.




SIGNATURE
Pursuant to the requirements of the Securities Exchange Act of 1934, the registrant has duly caused this report to be signed on its behalf by the undersigned hereunto duly authorized.
OTTER TAIL CORPORATION
Date: May 15, 2026By:/s/ Tyler J. Nelson
Tyler J. Nelson
Vice President and Chief Financial Officer

Source: View Original Filing on SEC EDGAR

FAQ

What did Otter Tail Corporation (OTTR) announce in its latest 8-K?

Otter Tail Corporation reported that its utility subsidiary filed a 2026 Integrated Resource Plan with Minnesota regulators. The plan outlines preferred generation additions, including natural gas, wind, solar and storage projects, to meet customer capacity and energy needs over the next 15 years.

What new generation resources are in Otter Tail’s 2026 Integrated Resource Plan?

The preferred plan includes a 50-megawatt natural gas plant expected in 2031 or 2032 and two 50-megawatt wind facilities planned for 2035 and 2040. These additions are designed to meet anticipated long-term capacity and energy requirements for Otter Tail Power customers.

Which solar and storage projects does Otter Tail (OTTR) highlight in the filing?

The plan reflects the 50-megawatt Solway Solar project expected in 2026, the 295-megawatt Abercrombie Solar project expected in 2028, and a 75-megawatt battery storage facility. These projects stem from the company’s previously approved resource plan and are already in development or under construction.

How will Otter Tail handle the Coyote Station coal plant for Minnesota customers?

Otter Tail Power is prepared to designate the Minnesota share of the Coyote Station coal plant as an Available Maximum Emergency resource starting June 1, 2026. It plans to stop serving Minnesota customers from Coyote Station as soon as feasible, and no later than December 31, 2031.

Who reviews Otter Tail Power’s 2026 Integrated Resource Plan?

The 2026 Integrated Resource Plan was filed with the Minnesota Public Utilities Commission. That commission reviews the utility’s preferred plan for meeting anticipated capacity and energy needs, including proposed new generation resources, timing of additions, and treatment of existing facilities such as Coyote Station.

Does the Otter Tail (OTTR) filing include forward-looking statements?

Yes. The company notes that statements about future generation additions, regulatory outcomes, timing, and operational and financial impacts are forward-looking. It highlights risks and uncertainties and refers investors to its most recent Form 10-K and subsequent Form 10-Q reports for more detailed risk disclosures.

Filing Exhibits & Attachments

3 documents

Other Documents