year ended December 31, 2018 as a result of this amendment representing write offs of certain debt financing costs. On March 8, 2019, the Company entered into interest rate swap agreements with counterparties to hedge the cash flows associated with the interest payments on the entire principal of the Term Loan, paying an average fixed rate of 2.54%. In return, the counterparties agreed to pay the variable interest payments due to the lenders until maturity.
On October 17, 2017, Terra Operating LLC entered into a new senior secured revolving credit facility (the “Revolver”) in an initial amount of $450.0 million, available for revolving loans and letters of credit, and maturing in October 2021. All outstanding amounts originally bore interest at a rate per annum equal to, at Terra Operating LLC’s option, either (i) a base rate plus a margin ranging between 1.25% to 2.00% or (ii) a reserve adjusted Eurodollar rate plus a margin ranging between 2.25% to 3.00%. In addition to paying interest on outstanding principal under the Revolver, Terra Operating LLC is required to pay a standby fee in respect of the unutilized commitments thereunder, payable quarterly in arrears. This standby fee ranges between 0.375% and 0.50% per annum. The Revolver provides for voluntary prepayments, in whole or in part, subject to notice periods. There are no prepayment penalties or premiums other than customary breakage costs. On February 6, 2018, Terra Operating LLC entered into an amendment to increase the facility limit to $600.0 million. On October 5, 2018, Terra Operating LLC entered into an amendment to (i) reduce the interest rate by 0.75% per annum, and (ii) extend the maturity date of the Revolver to October 2023. The Revolver currently bears interest at a rate equal to, at Terra Operating LLC’s option, either (i) LIBOR plus an applicable margin ranging from 1.50% to 2.25% per annum, or (ii) a base rate plus an applicable margin ranging from 0.50% to 1.25% per annum. The Company did not incur additional debt or receive any proceeds in connection with the October 5, 2018 amendment.
Under the Revolver, each of Terra Operating LLC’s existing and subsequently acquired or organized domestic restricted subsidiaries (excluding non-recourse subsidiaries) and Terra LLC are or will become guarantors. The Revolver, each guarantee and any interest rate, currency hedging or hedging of REC obligations of Terra Operating LLC or any guarantor owed to the administrative agent, any arranger or any lender under the Revolver is secured by first priority security interests in (i) all of Terra Operating LLC’s, each guarantor’s and certain unencumbered non-recourse subsidiaries’ assets, (ii) 100% of the capital stock of each of Terra Operating LLC and its domestic restricted subsidiaries and 65% of the capital stock of Terra Operating LLC’s foreign restricted subsidiaries and (iii) all intercompany debt. The Revolver is secured equally and ratably with the Term Loan.
On January 28, 2015, Terra Operating LLC issued $800.0 million of 5.875% senior notes due 2023 at an offering price of 99.214% of the principal amount. Terra Operating LLC used the net proceeds from the offering to fund a portion of the purchase price payable in the First Wind Acquisition. On June 11, 2015, Terra Operating LLC issued an additional $150.0 million of 5.875% senior notes due 2023 (collectively, with the $800.0 million initially issued, the “Old Senior Notes due 2023”). The offering price of the additional $150.0 million of notes was 101.5% of the principal amount, and Terra Operating LLC used the net proceeds from the offering to repay existing borrowings under the Company’s previous revolving credit facility.
On July 17, 2015, Terra Operating LLC issued $300.0 million of 6.125% senior notes due 2025 at an offering price of 100% of the principal amount (the “Old Senior Notes due 2025”). Terra Operating LLC used the net proceeds from the offering to fund a portion of the purchase price of the acquisition of the wind power plants from affiliates of Invenergy, LLC (“Invenergy Wind”).
During 2016 and 2017, Terra Operating LLC received certain notices of an event of default under the Old Senior Notes due 2023 and the Old Senior Notes due 2025 for failure to comply with its obligation under the respective indentures to timely file certain of the Company's periodic financial statements, but in each case the Company filed the respective financial statements with the SEC within the grace period for delivery that still applied per the respective indentures (which was extended in one case as discussed directly below), and consequently no events of default occurred with respect to these late filings.
On August 30, 2016, the Company announced the successful completion of a consent solicitation from holders of its Old Senior Notes due 2023 and its Old Senior Notes due 2025 to obtain waivers relating to certain reporting covenants (which included an extension of the deadline for filing the Company's 2015 Form 10-K and Form 10-Q for the first quarter of 2016)