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CONVERTIBLE PROMISSORY NOTES
 6 Months Ended
Jun. 30, 2021
Debt Disclosure [Abstract]  
CONVERTIBLE PROMISSORY NOTES NOTES PAYABLE
Revolving Loan Due to SPE Member
In April 2017, the Company entered into a revolving loan agreement with an affiliate of a member of certain of the Company’s special purpose entities (“SPE”). This agreement was, from time to time, subsequently amended. The purpose of this revolving loan agreement was to finance the Company’s purchase of hardware for its various energy storage system projects. As of the beginning of 2020, the agreement had a total revolving loan capacity of $45.0 million that bore fixed interest at 10% with a maturity date of June 2020.
In May 2020, concurrent with the 2020 Credit Agreement discussed below, the Company entered into an amendment to the revolving loan agreement, which reduced the loan capacity to $35.0 million and extended the maturity date to May 2021. The amendment increased the fixed interest rate for any borrowings outstanding more than nine months to 14% thereafter. Additionally, under the original terms of the revolving loan agreement, the Company was able to finance 100% of the value of the hardware purchased up to the total loan capacity. The amendment reduced the advance rate to 85%, with an additional reduction to 70% in August 2020. The amendment was accounted for as a modification of the debt, which did not have a material impact on the condensed consolidated financial statements. As of December 31, 2020, the Company had $7.4 million outstanding under the revolving loan agreement. In April 2021, the Company repaid the remaining outstanding balance of this facility with the proceeds received from the Merger. The facility was terminated after the repayment in April 2021.
Term Loan Due to SPE Member
In December 2018, the Company entered into a term loan in the amount of $13.3 million with an affiliate of a member of certain SPEs with the Company. As of the beginning of 2020, the term loan bore fixed interest of 12.5% on the outstanding principal balance with a final balloon payment of $3.0 million due at the maturity date of June 30, 2020. In May 2020, the Company repaid the remaining outstanding balance of $5.9 million with the proceeds received through the 2020 Credit Agreement discussed below.
Term Loan Due to Former Non-Controlling Interest Holder
In June 2018, the Company acquired the outstanding member interests of an entity controlled by the Company for $8.1 million. The Company financed this acquisition by entering into a term loan agreement with the noncontrolling member bearing fixed interest of 4.5% per quarter (18.0% per annum) on the outstanding principal balance. The loan required fixed quarterly payments throughout the term of the loan, which was scheduled to be paid in full by April 1, 2026.
In May 2020, the Company amended the term loan and, using the proceeds from the 2020 Credit Agreement discussed below, prepaid $1.5 million of principal and interest on the note, of which $1.0 million was towards the outstanding principal balance, thereby reducing the fixed quarterly payment due to the lender. In relation to this amendment, the Company was required to issue warrants for 400,000 shares of common stock resulting in a discount to the term loan of $0.2 million. As of December 31, 2020, the outstanding balance was $5.8 million. In April 2021, the Company repaid the remaining outstanding balance of this facility with the proceeds received from the Merger. Upon prepayment of this facility, the Company incurred $2.6 million in prepayment penalties that were recorded to loss on extinguishment of debt in the Company’s statement of operations. The facility was terminated after the repayment in April 2021.
2020 Credit Agreement
In May 2020, the Company entered into a credit agreement (“2020 Credit Agreement”) with a new lender that provided the Company with proceeds of $25.0 million to provide the Company with access to working capital towards the purchase of energy storage system equipment. The 2020 Credit Agreement has a maturity date of the earlier of (1) May 2021, (2) the maturity date of the revolving loan agreement, or (3) the maturity date of the convertible promissory notes discussed below. The loan bore interest of 12% per annum, of which 8% was paid in cash and 4% added back to principal of the loan balance every quarter. The Company used a portion of the proceeds towards payments associated with existing debt as previously discussed. As of December 31, 2020, the outstanding balance was $25.6 million. In April 2021, the Company repaid the remaining outstanding balance of this facility with the proceeds received from the Merger. Upon prepayment of this facility, the Company incurred $1.4 million in prepayment penalties that were recorded to loss on extinguishment of debt in the Company’s statement of operations. The facility was terminated after the repayment in April 2021.
2021 Credit Agreement
In January 2021, the Company, through a wholly owned Canadian entity, entered into a credit agreement to provide a total of $2.7 million towards the financing of certain energy storage systems. The credit agreement is structured on a non-recourse basis and the system will be operated by the Company. The credit agreement has a stated interest of 5.45% and a maturity date of June 2031. The Company received an advance under the credit agreement of $1.8 million in January 2021. The repayment of advances received under this credit agreement is determined by the lender based on the proceeds generated by the Company through the operation of the underlying energy storage systems. As of June 30, 2021, and December 31, 2020, the outstanding balance was $1.8 million and zero, respectively. The Company was in compliance with all covenants associated with the 2021 Credit Agreement as of June 30, 2021.
The Company’s outstanding debt consisted of the following as of June 30, 2021 (in thousands):
6/30/2021
Outstanding principal$1,951 
Unamortized discount(232)
Carrying value of debt$1,719 
CONVERTIBLE PROMISSORY NOTES
As of December 31, 2020, the Company had various convertible notes outstanding to investors. The Company refers to the collective group of all such note instruments as the “Convertible Promissory Notes”. As of December 31, 2020, these Convertible Promissory Notes had a balance of $67.6 million. During the six months ended June 30, 2021, the Company issued additional Convertible Promissory Notes. The details of the convertible notes issued are set forth below. As of June 30, 2021, there were no Convertible Promissory Notes outstanding due to their conversion and cancellation upon the Merger.

Q1 2021 Convertible Notes
In January 2021, the Company issued and sold convertible promissory notes (the “Q1 2021 Convertible Notes”) under the same terms as the existing Convertible Promissory Notes to various investors with aggregate gross proceeds of $1.1 million. The Company evaluated the conversion option within the Q1 2021 Convertible Notes and determined the effective conversion price was beneficial to the note holders. As such, the Company recorded a beneficial conversion feature (“BCF”) related to the issuance of the Q1 2021 Convertible Notes based on the difference between the effective conversion rate and the fair value of the stock into which it was convertible, limited by the amount of the aggregate gross proceeds. The BCF resulted in a $1.1 million discount to the Q1 2021 Convertible Notes with an increase to additional paid in capital. The Company accreted the discount in connection with the BCF as interest expense over the term of the Q1 2021 Convertible Notes using the effective interest rate method.
Conversion and Cancellation of Convertible Promissory Notes Upon Merger
Immediately prior to the effectiveness of the Merger, the entire balance of the Company’s outstanding Convertible Promissory Notes issued by Legacy Stem automatically converted into shares of Legacy Stem Common Stock. Upon the effectiveness of the Merger, these shares of Legacy Stem Common Stock automatically converted into 10,921,548 shares of Class A common stock of Stem. The balance associated with the outstanding Convertible Promissory Notes totaling $77.7 million, including $7.7 million of interest accrued on the notes through the date of Merger, was reclassified to additional paid-in-capital. The unamortized portion of the debt discount associated with the outstanding Q1 2021 Convertible Notes totaling $1.1 million was fully expensed to loss on extinguishment of debt on the Company’s statement of operations.