"The South Dakota Public Utilities Commission (SDPUC) approved a settlement on March 1, 2019 addressing all issues of our South Dakota rate case except return on equity. The partial settlement includes approval of a phase-in plan to provide for a return on the amounts invested in the Merricourt wind and Astoria Station generation projects while the projects are under construction. The partial settlement also includes a moratorium on filing another general rate case in South Dakota until the new generation projects have been in service for a year. The partial settlement allowed us to retain the impact of lower tax rates related to the Tax Cuts and Jobs Act from January 1, 2018 through October 17, 2018 when interim rates went into effect. We expect a final determination on our allowed rate of return on equity sometime during the second quarter.

"Otter Tail Power Company continues to benefit from strong rate base growth investments and expects to invest $973 million in capital projects from 2019 through 2023, including regulated investments in renewable and natural gas-fired generation. This results in a projected compounded annual growth rate of approximately 8 percent in utility rate base from year end 2018 through 2023 and is expected to deliver value to customers and shareholders. We continue to make system investments to meet our customers' expectations, enable us to work smarter, reduce emissions and improve reliability and safety.

Cash Flows and Liquidity
Our consolidated cash provided by operations for the quarter ended March 31, 2019 was $17.1 million compared with $4.6 million for the quarter ended March 31, 2018. The primary reason for the $12.5 million increase in cash provided by operations between the quarters was a $10.0 million decrease in discretionary contributions to the corporation's funded pension plan. A $13.9 million net increase in cash provided by changes in noncurrent liabilities and deferred credits was mostly offset by a $12.0 million decrease in cash from accounts receivable between the quarters primarily related to an increase in receivables in the first quarter of 2019. We do not expect any issues in collecting the outstanding receivables.

• A $2.8 million increase in revenues related to increased consumption due to colder weather in the first quarter of 2019, evidenced by the 13.3% increase in heating degree days between the quarters.
• A $1.5 million increase in retail revenue in South Dakota due to the reversal of an expected refund related to reduced revenue requirements from January 1, 2018 through October 17, 2018 associated with the Tax Cuts and Jobs Act. Refund of this amount is not required under terms of the 2018 South Dakota rate case settlement agreement reached on March 1, 2019.
• A $1.1 million increase in South Dakota revenues related to an interim rate increase that went into effect on October 18, 2018.
• A $0.8 million increase in Minnesota Renewable Rider revenues due to increased cost recovery requirements resulting from the expiration of federal Production Tax Credits (PTCs) in November 2018 on Otter Tail Power Company's Ashtabula wind farm.
• A $0.7 million increase in Minnesota Transmission Cost Recovery rider revenues related to the recovery of investment and operating costs of the Big Stone South–Ellendale 345kV transmission line energized on February 6, 2019.
• A $0.4 million increase in retail revenue related to the recovery of increased fuel and purchased power costs. Fuel costs increased due to a 25.4% increase in generation from the higher-fuel-cost Hoot Lake Plant partially offset by a 12.7% decrease in generation from Coyote Station, a lower-fuel-cost generation unit. Increased demand due to the colder weather in 2019 drove market prices for electricity higher which resulted in increased dispatch of Hoot Lake Plant. Coyote Station was taken offline on March 26, 2019 for a planned spring maintenance outage.

BTD's revenue increase of $10.3 million included growth in parts revenue of $11.4 million related to increased sales in agricultural, construction, recreational vehicle, lawn and garden and industrial equipment end markets. Included in the parts revenue increase is the pass through of higher material costs of $6.3 million, with the remaining increase due to higher sales volume and an increase in pricing unrelated to material cost increases. The increase in parts revenue was partially offset by a $1.2 million decrease in tooling revenues. Revenues from scrap metal sales were essentially flat quarter over quarter, with a 6.8% increase in scrap volume offset by a 6.8% decrease in scrap metal prices. An increase in cost of products sold at BTD of $7.8 million resulted from both the increased sales volume and the $6.3 million in higher material costs passed through to customers.

At T.O. Plastics, revenues decreased $1.2 million primarily due to decreased sales of horticultural containers and industrial and life sciences products. The decline in horticultural sales is due to a customer moving some product to a competitor with injection molding capabilities and lower sales to two customers related to the timing of orders. Industrial sales were down due to a customer bringing more production in house. Challenging weather conditions in February were also a factor in weaker sales in the northern region of the United States. Product availability in February and the partial collapse of a section of a warehouse roof in March due to heavy snow also contributed to a slow start in horticultural sales in 2019.

The revenue decrease at T.O. Plastics was partially offset by a $0.6 million decrease in cost of products sold related to the decrease in sales volume partly offset by an increase in unabsorbed labor and overhead costs due to the decrease in production. Operating expenses increased by $0.2 million due to a loss associated with the partial collapse of a section of a warehouse roof in the first quarter of 2019. T.O. Plastics' income before tax decreased $0.7 million resulting in decreases in income tax expense and net income of $0.2 million and $0.5 million, respectively.

Plastics segment revenues and net income decreased $9.6 million and $3.1 million, respectively, due to a 16.8% decrease in pounds of pipe sold and a 3.1% decrease in polyvinyl chloride (PVC) pipe prices. An overall decrease in quarter-over-quarter sales volume was anticipated. Weather conditions across our sales territory also negatively impacted first quarter 2019 sales. Cost of products sold decreased $5.4 million due to the decrease in sales volume partially offset by a 2.5% increase in the cost per pound of pipe sold. The decrease in pipe prices in combination with the increase in costs per pound of pipe sold resulted in a 19.0% decrease in gross margin per pound of PVC pipe sold. Plastics segment operating and depreciation expenses were essentially unchanged between the quarters resulting in a $4.2 million decrease in segment operating income. Income tax expense decreased $1.1 million due to the decrease in operating income, resulting in a $3.1 million reduction in Plastics segment net income between the quarters.

2019 Business Outlook
We anticipate 2019 diluted earnings per share to be in the range of $2.10 to $2.25. We have taken into consideration strategies for improving future operating results, the cyclical nature of some of our businesses and current regulatory factors facing our Electric segment. We expect capital expenditures for 2019 to be $203 million compared with actual cash used for capital expenditures of $105 million in 2018. Our planned expenditures for 2019 include $61 million for the Merricourt wind generation project and $40 million for the planned natural gas-fired electric generation plant near Astoria, South Dakota.

• SDPUC approval of a partial rate-case settlement on March 1, 2019 on all issues in the rate case except return on equity. The business outlook assumes an annual net revenue increase of approximately $2.3 million. The partial settlement also allowed us to retain the impact of lower tax rates related to the Tax Cuts and Jobs Act from January 1, 2018 through October 17, 2018. This outcome favorably impacts 2019 earnings by approximately $0.02 per share.    
  
• Increases in allowance for funds used during construction (AFUDC) for planned capital projects, including the Merricourt wind generation project, and increases in AFUDC and North Dakota Generation Cost Recovery Rider revenue related to Astoria Station. Both of these projects are expected to begin construction in 2019.
  
• Increased revenues from completion of the Big Stone South–Ellendale project and additional transmission investments related to our South Dakota Transmission Reliability project.
  
• Decreased operating and maintenance expenses due to decreasing costs of pension, medical, workers compensation and retiree medical benefits. The decrease in pension costs is a result of an increase in the discount rate from 3.90% to 4.50%.

• Increased sales at BTD driven by growth in the recreational vehicle, lawn and garden and agricultural end markets. Most of this growth is organic with our existing customer base. Scrap revenues are expected to increase as well based on increased volume with scrap prices staying flat between the years.
• A decrease in earnings from T.O. Plastics mainly driven by the reasons mentioned above.
• Backlog for the manufacturing companies of approximately $165 million for 2019 compared with $142 million one year ago.

The presentation will be posted on our website before the webcast. To access the live webcast, go to www.ottertail.com/presentations.cfm and select "Webcast." Please allow time prior to the call to visit the site and download any software needed to listen in. An archived copy of the webcast will be available on our website shortly after the call.

Risk Factors and Forward-Looking Statements that Could Affect Future Results
The information in this release includes certain forward-looking information, including 2019 expectations, made under the Safe Harbor provisions of the Private Securities Litigation Reform Act of 1995. Although we believe our expectations are based on reasonable assumptions, actual results may differ materially from those expectations. The following factors, among others, could cause our actual results to differ materially from those discussed in the forward-looking statements:

• Federal and state environmental regulation could require us to incur substantial capital expenditures and increased operating costs.
• Volatile financial markets and changes in our debt ratings could restrict our ability to access capital and increase borrowing costs and pension plan and postretirement health care expenses.
• Any significant impairment of our goodwill would cause a decrease in our asset values and a reduction in our net operating income.
• The inability of our subsidiaries to provide sufficient earnings and cash flows to allow us to meet our financial obligations and debt covenants and pay dividends to our shareholders could have an adverse effect on us.
• We rely on our information systems to conduct our business, and failure to protect these systems against security breaches or cyber-attacks could adversely affect our business and results of operations. Additionally, if these systems fail or become unavailable for any significant period, our business could be harmed.
• Economic conditions could negatively impact our businesses.
• If we are unable to achieve the organic growth we expect, our financial performance may be adversely affected.
• Our plans to grow our businesses through capital projects, including infrastructure and new technology additions, or to grow or realign our businesses through acquisitions or dispositions may not be successful, which could result in poor financial performance.
• We may, from time to time, sell assets to provide capital to fund investments in our electric utility business or for other corporate purposes, which could result in the recognition of a loss on the sale of any assets sold and other potential liabilities. The sale of any of our businesses could expose us to additional risks associated with indemnification obligations under the applicable sales agreements and any related disputes.
• Significant warranty claims and remediation costs in excess of amounts normally reserved for such items could adversely affect our results of operations and financial condition.
• We are subject to risks associated with energy markets.
• Changes in tax laws, as well as judgments and estimates used in the determination of tax-related asset and liability amounts, could materially adversely affect our business, financial condition, results of operations and prospects.
• Four of our operating companies have single customers that provide a significant portion of the individual operating company's and the business segment's revenue. The loss of, or significant reduction in revenue from, any one of these customers would have a significant negative financial impact on the operating company and its business segment and could have a significant negative financial impact on us.
• We may experience fluctuations in revenues and expenses related to our electric operations, which may cause our financial results to fluctuate and could impair our ability to make distributions to shareholders or scheduled payments on our debt obligations, or to meet covenants under our borrowing agreements.
• Actions by the regulators of our electric operations could result in rate reductions, lower revenues and earnings or delays in recovering capital expenditures.
• Our electric operations are subject to an extensive legal and regulatory framework under federal and state laws as well as regulations imposed by other organizations that may have a negative impact on our business and results of operations.
• Our electric transmission and generation facilities could be vulnerable to cyber and physical attack that could impair our ability to provide electrical service to our customers or disrupt the U.S. bulk power system.
• Our electric generating facilities are subject to operational risks that could result in unscheduled plant outages, unanticipated operation and maintenance expenses and increased power purchase costs.
• Changes to regulation of generating plant emissions, including but not limited to carbon dioxide emissions and regional haze regulation under state implementation plans, could affect our operating costs and the costs of supplying electricity to our customers and the economic viability of continued operation of certain of our steam-powered electric plants.
• Competition from foreign and domestic manufacturers, the price and availability of raw materials, trade policy and tariffs affecting prices and markets for raw material and manufactured products, prices and supply of scrap or recyclable material and general economic conditions could affect the revenues and earnings of our manufacturing businesses.
• Our plastics operations are highly dependent on a limited number of vendors for PVC resin and a limited supply of PVC resin. The loss of a key vendor, or any interruption or delay in the supply of PVC resin, could result in reduced sales or increased costs for our plastics business.
• We compete against many other manufacturers of PVC pipe and manufacturers of alternative products. Customers may not distinguish the pipe companies' products from those of our competitors.
• Changes in PVC resin prices can negatively affect our plastics business.

About the Corporation: Otter Tail Corporation has interests in diversified operations that include an electric utility and manufacturing businesses. Otter Tail Corporation stock trades on the Nasdaq Global Select Market under the symbol OTTR. The latest investor and corporate information are available at www.ottertail.com. Corporate offices are in Fergus Falls, Minnesota, and Fargo, North Dakota.