On September 11, 2009, the Company entered into a Loan Agreement in the aggregate principal amount of $300,000 with the Wisconsin Department of Commerce (the “Department”). The outstanding principal balance bears interest at the annual rate of 2%. Payment of interest and principal is to be made in the following manner: (a) payment of any and all interest that accrues from the date of disbursement commenced on January 1, 2010 and continued on the first day of each consecutive month thereafter through and including December 31, 2010; (b) commencing on January 1, 2011 and continuing on the first day of each consecutive month thereafter through and including November 1, 2016, the Company shall pay equal monthly installments of $4,426 each; followed by a final installment on December 1, 2016 which shall include all remaining principal, accrued interest and other amounts owed by the Company to the Department under the Loan Agreement. The Company may prepay amounts outstanding under the credit facility in whole or in part at any time without penalty. The Loan Agreement is secured by substantially all of the Company’s assets and the proceeds from this loan were used for the working capital requirements of the Company. The Loan Agreement contains covenants which require, among other things, that the Company shall keep and maintain 75 existing full-time positions and create and fill 35 additional full-time positions in Milwaukee, Wisconsin by December 31, 2012. On June 18, 2012, the Department agreed to waive all penalties associated with the Company’s noncompliance with this covenant. The outstanding borrowings under the agreement as of June 30, 2013 and December 31, 2012 were $179,328 and $203,947, respectively.

Promissory Note

On March 4, 2011, the Company sold all its Series 5 PLC product line assets to Wisconsin-based Dynamic Ratings, Inc. (“Purchaser”) under an Asset Purchase Agreement (“APA”). Per the APA, the Company signed an unsecured Promissory Note (the “Note”) due to purchaser in the aggregate principal amount of $700,000. The outstanding principal balance bears interest at the annual rate of 6% and was originally due on March 31, 2014. The Note may be prepaid in whole or in part, without penalty at any time. The Note contains certain earn-out provisions that encompass both the Company’s and Purchaser’s revenue volumes. Amounts earned under the earn-out provisions were applied against the Note on June 30, 2012 and June 30, 2013. For the periods ended June 30, 2013 and June 30, 2012, the non-cash reduction of principal calculated under these provisions and applied to the Note was $41,902 and $15,408, respectively. Payments not made when due, by maturity acceleration or otherwise, shall bear interest at the rate of 12% per annum from the date due until fully paid. Effective April 30, 2013, Purchaser approved an amendment to certain terms of the Note. Telkonet commenced a monthly payment of principal and interest of $20,000 to be applied against the outstanding balance starting May 1, 2013. The interest rate remains unchanged at 6% and the maturity date was extended to January 1, 2016. The outstanding principal balance of the Note as of June 30, 2013 and December 31, 2012 was $609,033 and $684,592, respectively.

Revolving Credit Facility

On May 31, 2013, the Company entered into a Revolving Credit Facility (the “Agreement”) with Bridge Bank, NA, (the “Bank”) in a principal amount not to exceed $2,000,000. The Agreement is subject to a borrowing base that is equal to the sum of 80% of the Company’s eligible accounts receivable and 25% of the eligible inventory. The Agreement is available for working capital and other lawful general corporate purposes. The outstanding principal balance of the facility bears interest at Prime Rate plus 2.75%. The Company’s borrowing base at June 30, 2013 was $530,813 and the outstanding balance was $0.

Aggregate annual future maturities of long-term debt as of June 30, 2013 are as follows: