Quarterly report pursuant to Section 13 or 15(d)

Noncontrolling interests

Noncontrolling interests	3 Months Ended
Noncontrolling interests	Mar. 31, 2014
Noncontrolling Interest [Abstract]
Noncontrolling interests	Noncontrolling interests Shares of restricted common stock issued under Ilios's equity compensation plan, but which have not yet vested, have not been included in calculating the percentages in this Note 6. As of December 31, 2010 Tecogen owned 63.0% of Ilios. During the year ended December 31, 2012 Tecogen purchased 1,500,000 shares of Ilios common stock at $0.50 per share for an aggregate amount of $750,000 which increased Tecogen's ownership interest to 67.4%. During the year ended December 31, 2013 Ilios sold 1,000,000 shares of common stock to an accredited investor at $0.50 per share for an aggregate amount of $500,000. Also during the year ended December 31, 2013, Tecogen purchased 1,000,000 shares of Ilios common stock at $0.50 per share for an aggregate amount of $500,000. The net result decreased Tecogen’s ownership interest to 65.0%.

- Definition

The entire disclosure for noncontrolling interest in consolidated subsidiaries, which could include the name of the subsidiary, the ownership percentage held by the parent, the ownership percentage held by the noncontrolling owners, the amount of the noncontrolling interest, the location of this amount on the balance sheet (when not reported separately), an explanation of the increase or decrease in the amount of the noncontrolling interest, the noncontrolling interest share of the net Income or Loss of the subsidiary, the location of this amount on the income statement (when not reported separately), the nature of the noncontrolling interest such as background information and terms, the amount of the noncontrolling interest represented by preferred stock, a description of the preferred stock, and the dividend requirements of the preferred stock.

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