Otter Tail Corp

Overview

Otter Tail Corporation is a diversified holding company operating in the electric utility, manufacturing, and plastics sectors. Its businesses provide electric service, metal fabrication and thermoformed plastic products, and PVC pipe.[1]+4

Its electric utility serves western Minnesota, eastern North Dakota, and northeastern South Dakota. Its manufacturing operations are based in Georgia, Illinois, Minnesota, North Dakota, and Arizona, with products sold primarily in the United States and, for PVC pipe, also in Canada.[3]+2 The company states its mission is to deliver value by building strong electric utility and manufacturing platforms; its vision is to build top-performing companies in a diversified organization with an electric utility as its foundation.[6]

For 2025, Otter Tail reported $1.304 billion in consolidated operating revenue and 2,198 full-time employees as of December 31.[7][8] Its electric utility, Otter Tail Power, dates back to 1907.[9] [1]+9

Products & services

Otter Tail provides regulated electric service through generation, transmission and distribution in western Minnesota, eastern North Dakota and northeastern South Dakota. In its first six months of 2026, electric revenue was $287.2 million, about 42.1% of total operating revenue.[10][11]

Its manufacturing businesses supply custom metal parts and tooling for original-equipment manufacturers, with capabilities including prototyping, tool design and building, robotic welding, stamping, tube forming and bending, assembly, coating, and packaging and sequencing. The portfolio includes welded frames and chassis, roll cages, heat shields, brackets, handles and railings. Stamping presses range from 45 to 800 tons, and manufacturing capacity exceeds one million square feet.[12]+2 Manufacturing revenue was $178.0 million in the first half of 2026, approximately 26.1% of total operating revenue; metal parts and tooling accounted for $155.2 million and plastic products and tooling for $18.7 million.[11]

T.O. Plastics makes horticultural products such as pots, trays and propagation sheets, as well as custom thermoformed packaging for medical devices, laboratory and shipping trays, enclosures and consumer packaging. Its services include product design, prototyping, tooling, pelletizing, extrusion and thermoforming; its Otsego facility includes two Class 8 cleanrooms for medical products.[15]+3 Otter Tail also produces PVC pipe for potable-water transmission and distribution, wastewater, storm drainage and other water infrastructure uses. Disclosed pipe diameters range from ¾ to 24 inches, with typical lengths of 10–20 feet and lengths up to 45 feet for some types.[19]+3 Plastics/PVC pipe revenue was $216.2 million in the first half of 2026, about 31.7% of total operating revenue.[11] [10]+12

Geographic presence

Otter Tail Corporation’s principal executive office is in Fergus Falls, Minnesota. Its electric utility, Otter Tail Power Company, serves about 134,000 customers across roughly 70,000 square miles in western Minnesota, eastern North Dakota and northeastern South Dakota.[23][24]

The utility’s generation facilities span the three-state service area and include sites in Big Stone City, South Dakota; Beulah, Jamestown and several wind-center locations in North Dakota; and Otter Tail County and Solway, Minnesota, as well as additional facilities in South Dakota.[25] Planned transmission projects connect Big Stone, South Dakota, with Alexandria and Big Oaks, Minnesota, and with Hankinson and Mapleton, North Dakota.[26][27]

Beyond the utility territory, Otter Tail subsidiaries have locations in Fargo and Detroit Lakes, Minnesota, Clearwater, Minnesota, and Phoenix, Arizona; BTD also reports facilities in Illinois and Georgia. Northern Pipe Products, based in Fargo, states that it sells in parts of the United States and in central and western Canada.[28][29] The FY2025 report does not provide revenue percentages by country, state or region, or employee totals by location.[30] [23]+31

Business segments

Otter Tail Corp reported three segments for FY2025: Electric, Manufacturing, and Plastics. Based on segment operating revenue as a share of consolidated operating revenue, Electric contributed approximately 43.5% ($566.8 million of $1,304.1 million). It is a vertically integrated regulated utility that produces, transmits, distributes, and sells electricity in western Minnesota, eastern North Dakota, and northeastern South Dakota.[31]+3

Manufacturing contributed approximately 24.1% of FY2025 operating revenue ($314.5 million), with activities including metal fabrication of custom machine parts and components and production of thermoformed plastic products.[34]+2 Plastics contributed approximately 32.4% ($422.8 million), primarily producing PVC pipe for municipal water infrastructure, as well as residential and commercial construction and rural water systems.[36]+2 [31]+7

Company history

Otter Tail Power Company was incorporated in Minnesota on July 5, 1907, and began supplying electricity in April 1909, when its Dayton Hollow hydroelectric plant came online. In 1941, it merged with Union Public Service Company, expanding its utility operations.[38]+2

The company broadened beyond electric utility operations through manufacturing acquisitions, including BTD Manufacturing and Northern Pipe Products in 1995, Vinyltech in 2000, and T.O. Plastics in 2001. That year, shareholders changed the parent company’s name to Otter Tail Corporation, while the utility retained the Otter Tail Power Company name; a 2009 reorganization established the present parent-subsidiary structure.[28]+2

From 2011, Otter Tail pursued a strategic transformation that included exiting its construction segment and concentrating nonutility investment on manufacturing. In 2015, it sold Aevenia, its energy and electrical construction business, and BTD acquired Impulse Manufacturing. In 2023, Otter Tail Power completed its purchase of the 62.4-megawatt Ashtabula III wind facility, previously contracted under a power-purchase agreement.[43]+3 [38]+9

Sources

• Otter Tail Corp — Full financial report (2025 Y)
  33 citations

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• www.ottertail.com[6]
• Otter Tail Corp — Full financial report (2026 Q 2)[10][11]
• www.ottertail.com[28]
• www2.mnhs.org[38]
• www.otpco.com[39]
• issuu.com[40]
• www.sec.gov[41]
• www.sec.gov[42]
• www.ottertail.com[43]
• www.ottertail.com[44]
• www.ottertail.com[45]
• www.ottertail.com[46]