3. NET INVESTMENT IN SALES-TYPE LEASES

Under sales-type leases, Xi’an TCH leased TRT systems to Zhangzhi with terms of 5 and 13 years, respectively; and leased CHPG systems to Tong Chuan, Shengwei, and Jing Yang Shengwei respectively for 5 years, BMPG systems to Pucheng for 15 years, BMPG systems to Shenqiu Phase I for 11 years, Shenqiu Phase II for 9.5 years, a power and steam generating system from waste heat from metal refining to Erdos (five projects) for 20 years, and Datong two BPRT systems for 30 years.The components of the net investment in sales-type leases as of June 30, 2013 and December 31, 2012 are as follows:

	2013		2012
Total future minimum lease payments receivable	$	451,595,852	$	380,608,263
Less: executory cost		(123,200,558)		(113,529,216)
Less: unearned interest income		(174,581,819)		(138,668,584)
Net investment in sales - type leases		153,813,475		128,410,463
Current portion		10,785,754		10,389,028
Noncurrent portion	$	143,027,721	$	118,021,435

As of June 30, 2013, the future minimum rentals to be received on non-cancelable sales-type leases by years are as follows:

2014	$	39,630,307
2015		31,985,296
2016		31,952,927
2017		31,952,927
2018		31,952,927
Thereafter		284,121,468
Total	$	451,595,852