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Tortoise Energy Infrastructure Corporation

Shareholder Transaction Expenses [Table Text Block]

Shareholder Transaction Expenses (as a percentage of offering price)
Sales Load(1)		1.00	%*
Offering Expenses Borne by the Company (as a percentage of offering price)(2)		0.12	%
Dividend Reinvestment and Cash Purchase Plan Fees (in dollars)(3)	$	15

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* The maximum sales charge for offerings made at the market is 1.00%.

(1) Represents the estimated commission with respect to the Common Shares being sold under this Prospectus Supplement and the accompanying Prospectus. There is no guarantee that there will be any sales of Common Shares under this Prospectus Supplement and the accompanying Prospectus. Actual sales of Common Shares under this Prospectus Supplement and the accompanying Prospectus, if any, may be less than as set forth under “Capitalization” below. In addition, the price per Common Share of any such sale may be greater or less than the price set forth under “Capitalization” below, depending on market price of the Common Shares at the time of any such sale.

(2) Assumes offering expenses of $130,000 and the sale of 2,500,000 Common Shares at a sales price per Common Share of $44.15, which represents the last reported sales price of the Common Shares on the NYSE on September 11, 2026. There is no guarantee that there will be any sales of Common Shares under this Prospectus Supplement and the accompanying Prospectus. Actual sales, if any, of the Common Shares under this Prospectus Supplement and the accompanying Prospectus may be at a price greater or less than $44.15 per Common Share, depending on the market price of the Common Shares at the time of any such sale.

(3) Shareholders will pay a transaction fee of $15 plus brokerage charges if they direct the Plan Agent to sell Common Shares held in a Plan account. See “Automatic Dividend Reinvestment and Cash Purchase Plan” in the Prospectus.

Dividend Reinvestment and Cash Purchase Fees

^[3]

$ 15

Other Transaction Expense 1 [Percent]

^[4]

0.12%

Management Fees [Percent]

^[5],[6]

1.24%

Dividend Expenses on Preferred Shares [Percent]

^[6],[8]

0.32%

Other Annual Expenses [Percent]

^[6],[9]

0.26%

Expense Example [Table Text Block]

EXAMPLE

The following example demonstrates the hypothetical dollar amount of total cumulative expenses that would be incurred over various periods with respect to a hypothetical investment in our Common Shares. The following example illustrates the expenses that Common Shareholders would pay on a $1,000 investment in Common Shares, assuming (1) the sales load of 1.00% and estimated offering expenses of $130,000, (2) total annual expenses, excluding tax liabilities, of 2.99% of net assets attributable to Common Shares, (3) a 5% annual return, and (4) all distributions are reinvested at NAV:

		1 Year			3 Years			5 Years			10 Years
Total Expenses Paid by Common Shareholders		$	41		$	102		$	166		$	338

The example above should not be considered a representation of future expenses. Actual expenses may be greater or less than those shown above.

Expense Example, Years 1 to 3

102

Expense Example, Years 1 to 10

$ 338

Other Transaction Fees, Note [Text Block]

Shareholders will pay a transaction fee of $15 plus brokerage charges if they direct the Plan Agent to sell Common Shares held in a Plan account. See “Automatic Dividend Reinvestment and Cash Purchase Plan” in the Prospectus.

Management Fee not based on Net Assets, Note [Text Block]

Reflects management fee as of May 31, 2026. “Management Fee” is based on Managed Assets, which means the average daily gross asset value of the Company (which includes assets attributable to the principal amount of any borrowings), minus accrued liabilities (other than the principal amount of such borrowings), and reflects an annual rate of 0.95% of average monthly Managed Assets up to $2.5 billion, 0.90% of average monthly Managed Assets between $2.5 billion and $3.5 billion, and 0.85% of average monthly Managed Assets above $3.5 billion. There is no investment advisory agreement with, or management fees charged to, any Subsidiary.

Investment Objectives and Practices [Text Block]

Investment Objective

Our investment objective is to seek a high level of total return with an emphasis on current distributions paid to stockholders. We cannot assure you that we will achieve our investment objective.

Share Price [Table Text Block]

Market and Net Asset Value Information

Our currently outstanding Common Shares are, and the Common Shares offered by this Prospectus Supplement and accompanying Prospectus will be, subject to notice of issuance, listed on the NYSE under the symbol “TYG.” Our Common Shares commenced trading on the NYSE on February 25, 2004.

Our Common Shares have traded both at a premium and at a discount in relation to NAV. We cannot predict whether our Common Shares will trade in the future at a premium or discount to NAV. The provisions of the Investment Company Act of 1940, as amended (the “1940 Act”), generally require that the public offering price of common stock (less any underwriting commissions and discounts) must equal or exceed the NAV per share of a company’s additional common stock (calculated within 48 hours of pricing). Our issuance of additional Common Shares may have an adverse effect on prices in the secondary market for our Common Shares by increasing the number of Common Shares available, which may put downward pressure on the market price for our Common Shares. The continued development of alternatives as vehicles for investing in a portfolio of energy infrastructure MLPs, including other publicly traded investment companies and private funds, may reduce or eliminate any tendency of our Common Shares to trade at a premium in the future. Shares of common stock of closed-end investment companies frequently trade at a discount from NAV. See “Risk Factors — Risks Related to Our Operations — Market Discount Risk” in the accompanying Prospectus.

The following table sets forth for each of the periods indicated the high and low closing market prices for our Common Shares on the NYSE, the NAV per share and the premium or discount to NAV per share at which our Common Shares were trading. See “Determination of Net Asset Value” in the accompanying Prospectus for information as to the determination of our NAV.

Fiscal Quarter Ended	Market Price(1)				NAV(2)		Premium/(Discount) to NAV(3)
Fiscal Quarter Ended	High		Low		NAV(2)		High		Low
February 2024	$	29.82	$	27.63	$	35.33	(15.6	)%	(21.8	)%
May 2024	$	35.15	$	29.17	$	35.56	(1.2	)%	(18.0	)%
August 2024	$	36.98	$	32.65	$	40.48	(8.6	)%	(19.3	)%
November 2024	$	46.00	$	35.59	$	42.82	7.4	%	(16.9	)%
February 2025	$	48.43	$	41.30	$	52.23	(7.3	)%	(20.9	)%
May 2025	$	44.40	$	35.42	$	48.51	(8.5	)%	(27.0	)%
August 2025	$	43.89	$	41.04	$	44.80	(2.0	)%	(8.4	)%
November 2025	$	44.39	$	41.90	$	45.76	(3.0	)%	(8.4	)%
February 2026	$	49.85	$	40.41	$	46.74	6.7	%	(13.5	)%
May 2026	$	51.00	$	43.99	$	50.55	0.9	%	(13.0	)%
August 2026	$	44.98	$	41.89	$	46.91	(4.1	)%	(10.7	)%

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(1) Based on high and low closing market price for the respective quarter.

(2) Based on the NAV at the beginning of each respective quarter, calculated on the close of business on the last business day of the prior quarter.

(3) Calculated based on the market value and NAV information presented in the table. Percentages are rounded.

The last reported NAV and closing market price per Common Share on September 11, 2026 were $45.42 and $44.15, respectively, representing a (2.80)% discount to NAV. As of September 11, 2026, we had approximately 25,400,000 Common Shares outstanding and net assets of approximately $1.2 billion.