6. Our Portfolio

As of December 31, 2015, our Portfolio included approximately $1.3 billion of financing receivables, investments, real estate and equity method investments on our balance sheet. The financing receivables and investments are typically collateralized by contractually committed debt obligations of government entities or private high credit quality obligors and are often supported by additional forms of credit enhancement, including security interests and supplier guaranties. The real estate is typically land and related lease intangibles for long-term leases to wind and solar projects with high credit quality obligors. The equity method investments represent our minority equity investments in wind projects.

The following is an analysis of our Portfolio by type of obligor and credit quality as of December 31, 2015:

The components of financing receivables of December 31, 2015 and 2014 were as follows:

In accordance with the terms of certain financing receivables purchase agreements, payments of the purchase price is scheduled to be made over time, generally within twelve months of entering into the transaction, and as a result, we have recorded deferred funding obligations of $108 million and $88 million as of December 31, 2015 and 2014, respectively.

The following table provides a summary of our anticipated maturity dates of our financing receivables and investments and the weighted average yield for each range of maturities as of December 31, 2015:

Our real estate is leased to renewable energy projects, typically under long-term triple net leases with expiration dates that range between the years 2033 and 2045 under the initial terms and 2047 and 2080 if all extensions are exercised. The components of our real estate portfolio as of December 31, 2015 and 2014 were as follows:

There are conservation easement agreements covering several of our properties that limit the use of the property upon expiration of the respective leases. The real estate related intangible assets are amortized on a straight-line basis over the contracted lease term. As of December 31, 2015, the future amortization expense of these intangible assets is as follows:

As of December 31, 2015, the future minimum rental income payments under our land lease agreements is as follows:

In December 2013, we recorded an allowance of $11.0 million on the remaining $11.8 million balance of a $24 million loan made in May 2013 to a wholly owned subsidiary of EnergySource LLC (“EnergySource”) to be used for a geothermal project. In November 2014, we entered into a Forbearance and Mutual Release Agreement with EnergySource under which in full satisfaction of the remaining balance of our loan, we would realize a portion of the proceeds from the sale of land held by EnergySource in an estimated amount of $0.8 million. As a result of this agreement, we charged off $9.8 million of the receivable against the allowance, resulting in a remaining allowance of $1.2 million. During the year ended December 31, 2015, we collected the $0.8 million balance, as a final recovery from the EnergySource loan and therefore, we charged off the remaining loan balance of $1.2 million against the allowance of $1.2 million. There was no effect on the statement of operations for this loan during the years ended December 31, 2015 and 2014. For the year ended December 31, 2013, the loan had an average balance of $24.7 million and we recorded and collected interest income on the loan of $2.4 million. Certain of our executive officers and directors own an indirect minority interest in EnergySource following the distribution of the Predecessor’s ownership interest prior to our IPO.

We had no other financing receivables, investments or leases that were impaired or on nonaccrual status as of December 31, 2015, 2014 or 2013. We did not have any loan modifications that qualify as trouble debt restructurings for the years ended December 31, 2015, 2014, or 2013.