EuroSite Power (EUSP) 10-Q 15 May 14 2014 Q1 Quarterly report Financial data

DOCUMENT_AND_ENTITY_INFORMATIO

DOCUMENT AND ENTITY INFORMATION	3 Months Ended
	Mar. 31, 2014	15-May-14
Document and Entity Information [Abstract]	'	'
Entity Registrant Name	'EUROSITE POWER INC.	'
Entity Central Index Key	'0001528103	'
Current Fiscal Year End Date	'--12-31	'
Entity Filer Category	'Smaller Reporting Company	'
Trading Symbol	'eusp	'
Document Type	'10-Q	'
Amendment Flag	'false	'
Document Period End Date	31-Mar-14	'
Document Fiscal Period Focus	'Q1	'
Document Fiscal Year Focus	'2014	'
Entity Common Stock, Shares Outstanding	'	56,747,100

CONDENSED_CONSOLIDATED_BALANCE

CONDENSED CONSOLIDATED BALANCE SHEETS (USD $)	Mar. 31, 2014	Dec. 31, 2013
ASSETS	'	'
Cash and cash equivalents	$1,203,036	$1,519,602
Accounts receivable	116,844	153,514
Value added tax receivable	27,156	3,541
Inventory	14,115	385,660
Other current assets	40,804	52,957
Total current assets	1,401,955	2,115,274
Property, plant and equipment, net	4,553,181	4,030,330
Other assets, long-term	0	20,428
TOTAL ASSETS	5,955,136	6,166,032
LIABILITIES AND STOCKHOLDERS' EQUITY	'	'
Accounts payable	296,388	202,631
Due to related party	15,633	0
Accrued expenses and other current liabilities	99,789	71,080
Total current liabilities	411,810	273,711
Long-term liabilities	'	'
Convertible debentures	2,087,000	1,800,000
Convertible debentures due to related parties	2,550,778	2,200,000
Total liabilities	5,049,588	4,273,711
Stockholders' equity:	'	'
Common stock, $0.001 par value; 100,000,000 shares authorized; 56,747,100 issued and outstanding at March 31, 2014 and December 31, 2013.	56,747	56,747
Additional paid-in capital	6,738,506	6,690,610
Accumulated deficit	-5,889,705	-4,855,036
Total stockholder' equity	905,548	1,892,321
TOTAL LIABILITIES AND STOCKHOLDERS’ EQUITY	$5,955,136	$6,166,032

CONDENSED_CONSOLIDATED_BALANCE1

CONDENSED CONSOLIDATED BALANCE SHEETS (Parenthetical) (USD $)	Mar. 31, 2014	Dec. 31, 2013
Common stock, par value (in dollars per share)	$0.00	$0.00
Common stock, shares authorized	100,000,000	100,000,000
Common stock, shares issued	56,747,100	56,747,100
Common stock, shares outstanding	56,747,100	56,747,100

CONDENSED_CONSOLIDATED_STATEME

CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS (USD $)	3 Months Ended
	Mar. 31, 2014	Mar. 31, 2013
Revenues	'	'
Energy revenues	$430,778	$117,108
Turnkey & other revenues	1,406	0
Revenue, Net	432,184	117,108
Cost of sales	'	'
Fuel, maintenance and installation	328,741	94,470
Depreciation expense	70,696	15,164
Cost of Services	399,437	109,634
Gross profit	32,747	7,474
Operating expenses	'	'
General and administrative	193,174	195,266
Selling	116,114	181,218
Engineering	23,986	31,709
Operating Expenses	333,274	408,193
Loss from operations	-300,527	-400,719
Other income (expense)	'	'
Interest and other income	1,213	1,230
Interest expense	-21,778	-5,253
Loss on extinguishment of convertible debt	-713,577	0
Nonoperating Income (Expense)	-734,142	-4,023
Loss before income taxes	-1,034,669	-404,742
Net loss	($1,034,669)	($404,742)
Net loss per share - basic and diluted (in dollars per share)	($0.02)	($0.01)
Weighted-average shares outstanding - basic and diluted (in shares)	56,747,100	56,747,100

CONDENSED_CONSOLIDATED_STATEME1

CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS (USD $)	3 Months Ended
	Mar. 31, 2014	Mar. 31, 2013
CASH FLOWS FROM OPERATING ACTIVITIES:	'	'
Net loss	($1,034,669)	($404,742)
Adjustments to reconcile net loss to net cash used in operating activities:	'	'
Depreciation and amortization	72,419	15,164
Loss on extinguishment of debt	713,577	0
Amortization of deferred financing	2,509	0
Amortization of convertible debt premium	-18,222	0
Stock-based compensation	47,896	27,795
Changes in operating assets and liabilities	'	'
Accounts receivable	36,670	-23,377
Value added tax receivable	-23,615	-287,333
Inventory	371,545	-67,065
Prepaid and other current assets	-27,505	-21,731
Increase (decrease) in:	'	'
Accounts payable	93,757	377,619
Due to related party	15,633	-35,809
Accrued expenses and other current liabilities	28,709	-44,047
Net cash provided by (used in) operating activities	278,704	-463,526
CASH FLOWS FROM INVESTING ACTIVITIES:	'	'
Purchases of property and equipment	-595,270	-839,507
Net cash used in investing activities	-595,270	-839,507
CASH FLOWS FROM FINANCING ACTIVITIES:	'	'
Costs associated with fund raising	0	-4,558
Proceeds from cancellation of parent note	0	1,100,000
Net cash provided by (used in) financing activities	0	1,095,442
Net (decrease) increase in cash and cash equivalents	-316,566	-207,591
Cash and cash equivalents, beginning of the period	1,519,602	832,511
Cash and cash equivalents, end of the period	$1,203,036	$624,920

Description_of_business_and_su

Description of business and summary of significant accounting policies	3 Months Ended
	Mar. 31, 2014
Accounting Policies [Abstract]	'
Description of busienss and summary of significant accounting policies	'
	Description of business and summary of significant accounting policies:
	Description of Business
	EuroSite Power Inc., or the Company, we, our or us, distributes, owns and operates clean, on-site energy systems that produce electricity, hot water, heat and cooling in the United Kingdom and Europe. Our business model is to own the equipment it installs at customers’ facilities and to sell the energy produced by these systems to the customers on a long-term contractual basis at prices guaranteed to the customer to be below conventional utility rates. We call this business the EuroSite Power “On-Site Utility.”
	The Company was incorporated as a Delaware corporation on July 9, 2010 as a subsidiary of American DG Energy Inc., or American DG Energy, to introduce the American DG Energy On-Site Utility solution into the United Kingdom and the European market.
	Principles of Consolidation and Basis of Presentation
	The unaudited condensed consolidated financial statements, or the Unaudited Financial Statements, presented herein have been prepared by the Company, without audit, and, in the opinion of management, reflect all adjustments (consisting of normal recurring adjustments) necessary for a fair statement of the interim periods presented. The accompanying unaudited interim condensed consolidated financial statements have been prepared in accordance with accounting principles generally accepted in the United States of America, or GAAP, for interim financial information and pursuant to the rules and regulations of the Securities And Exchange Commission, or SEC, for reporting in this Quarterly Report on Form 10-Q, or the Quarterly Report. Accordingly, certain information and footnote disclosures required for complete financial statements are not included herein. It is suggested that the Unaudited Financial Statements be read in conjunction with the consolidated financial statements and notes included in the Company’s Form 10-K for the fiscal year ended December 31, 2013. The Company’s operating results for the three month period ended March 31, 2014, may not be indicative of the results expected for any succeeding interim periods or for the entire year ending December 31, 2014.
	The accompanying consolidated financial statements include the accounts of the Company and its wholly-owned subsidiary EuroSite Power Limited, a United Kingdom registered company.
	On July 9, 2010, American DG Energy invested $45,000 in exchange for 45 million shares of the Company’s common stock, par value $.001 per share, or Common Stock, and obtained controlling interest in the Company. Also on July 9, 2010, Nettlestone Enterprises Limited, invested $5,000 in exchange for 5 million shares of the Company’s Common Stock. As of March 31, 2014, American DG Energy owned a 70.7% interest in the Company and consolidates the Company into its financial statements in accordance with GAAP.
	The Company’s operations are comprised of one business segment. The Company’s business is to sell energy in the form of electricity, heat, hot water and cooling to its customers under long-term sales agreements. Occasionally the company will sell equipment or services to interested parties. All of the Company's revenue is generated in the United Kingdom. All of the Company's long lived assets are located in the United Kingdom.
	The Company has experienced total net losses since inception of $5.9 million. For the foreseeable future, the Company expects to experience continuing operating losses and negative cash flows from operations as its management executes its current business plan. The Company believes that its existing resources, including cash and cash equivalents, future cash flow from operations, its ability to control certain costs, including those related to general and administrative expenses, and the use of capital from its parent company, will be sufficient to meet the working capital requirements of its existing business for the foreseeable future, including the next 12 months; however, as the Company continues to grow its business by adding more energy systems, the cash requirements will increase. Beyond March 31, 2015, the Company may need to raise additional capital through debt financing or use capital provided by its parent to meet its operating and capital needs.There can be no assurance, however, that the Company will be successful in these fund-raising efforts or that additional funds will be available on acceptable terms, if at all.
	Since its inception to March 31, 2014, the Company has raised a total of $5,896,000 through various private placements of Common Stock. If the Company is unable to raise additional capital, the Company may need to terminate certain of its employees and adjust its current business plan. Financial considerations may cause the Company to modify planned deployment of new energy systems and the Company may decide to suspend installations until it is able to secure additional working capital. The Company will evaluate possible acquisitions of, or investments in, businesses, technologies and products that are complementary to its business; however, the Company is not currently engaged in such discussions.
	The following significant accounting policies are either currently in effect or are anticipated to become effective as the Company commences its normal business activities.
	Foreign Currency Transactions
	The functional currency and the reporting currency of the Company and subsidiary are the U.S. dollar. Transactions denominated in foreign currencies are translated into U.S. dollars at the exchange rate in effect on the date of the transactions. Exchange gains or losses on transactions are included in the Condensed Consolidated Statements of Operations. Such amounts were immaterial for all periods presented.
	Use of Estimates
	The preparation of financial statements in conformity with GAAP requires management to make estimates and assumptions that affect the reported amounts of assets and liabilities and disclosure of contingent assets and liabilities at the date of the financial statements and the reported amounts of revenues and expenses during the reporting period. Actual results could differ from those estimates.
	Revenue Recognition
	Revenue from energy contracts is recognized when electricity, heat, and chilled water is produced by the cogeneration systems on-site. The Company bills each month based on various meter readings installed at each site. The amount of energy produced by on-site energy systems is invoiced, as determined by a contractually defined formula. Under certain energy contracts, the customer directly acquires the fuel to power the systems and receives credit for that expense from the Company. The credit is recorded as reduction of revenue and as a reduction of fuel cost. Revenues from operation, including shared savings are recorded when provided and verified. Maintenance service revenue is recognized over the term of the agreement and is billed on a monthly basis in arrears.
	As a by-product of the energy business, in some cases, the customer may choose to have the Company construct the system for them rather than have it owned by the Company. In this case, the Company will account for revenue, or turnkey revenue, and costs using the percentage-of-completion method of accounting. Under the percentage-of-completion method of accounting, revenues are recognized by applying percentages of completion to the total estimated revenues for the respective contracts. Costs will be recognized as incurred. The percentages of completion are determined by relating the actual cost of work performed to date to the current estimated total cost at completion of the respective contracts. When the estimate on a contract indicates a loss, the Company's policy is to record the entire expected loss, regardless of the percentage of completion. The excess of contract costs and profit recognized to date on the percentage-of-completion accounting method in excess of billings will be recorded as unbilled revenue. Billings in excess of related costs and estimated earnings will be recorded as deferred revenue. The Company had no such arrangements at March 31, 2014 and 2013, respectively.
	Customers may buy out their long-term obligation under energy contracts and purchase the underlying equipment from the Company. Any resulting gain on these transactions will be recognized over the payment period in the accompanying consolidated statements of operations. The Company had no such arrangements to date.
	Occasionally the Company will enter into a sales arrangement with a customer to construct and sell an energy system and provide energy and maintenance services over the term of the contract. Based on the fact that the Company will sell each deliverable to other customers on a stand-alone basis, the Company will determine that each deliverable has a stand-alone value. Additionally, there are no rights of return relative to the delivered items; therefore, each deliverable will be considered a separate unit of accounting. Revenue will be allocated to each element based upon its relative fair value which is determined based on the estimated price of the deliverables when sold on a standalone basis. Revenue related to the construction of the energy system will be recognized using the percentage-of-completion method as the unit is being constructed. Revenue from the sale of energy will be recognized when electricity, heat, and chilled water is produced by the energy system, and revenue from maintenance services is recognized over the term of the maintenance agreement. The Company had no such arrangements to date.
	The Company may be able to participate in the demand response market and receive payments due to the availability of its energy systems. Demand response programs provide payments for either the reduction of electricity usage or the increase in electricity production during periods of peak usage throughout a utility territory. The Company had not recognized revenue from demand response activity to date.
	Other revenue represents various types of ancillary activities for which the Company expects to engage in from time to time such as the sale of equipment, and feasibility studies.
	Cash and Cash Equivalents
	The Company considers all highly liquid investments with a maturity of three months or less when purchased to be cash equivalents.
	Concentration of Credit Risk
	Financial instruments which potentially subject the Company to concentrations of credit risk consist of highly liquid cash equivalents. The Company has cash balances in certain financial institutions in amounts which occasionally exceed current federal deposit insurance limits. The financial stability of these institutions is continually reviewed by senior management. As of March 31, 2014, the Company had a balance of $1,203,036 in cash and cash equivalents. The Company believes it is not exposed to any significant credit risk on cash and cash equivalents.
	Accounts Receivable
	The Company maintains receivable balances with its customers. The Company reviews its customers’ credit history before extending credit and generally does not require collateral. An allowance for doubtful accounts is established based upon factors surrounding the credit risk of specific customers, historical trends and other information. Bad debts are written off when identified by management. At March 31, 2014 and December 31, 2013, there was no allowance for doubtful accounts.
	Inventory
	Inventories are stated at the lower of cost or market, valued on a first-in, first-out basis. Inventory is reviewed periodically for slow-moving and obsolete items.
	Supply Concentrations
	All of the Company’s cogeneration unit purchases for the periods ending March 31, 2014 and 2013, respectively, were from one vendor (see “Note 6 - Related parties”). The Company believes there are sufficient alternative vendors available to ensure a constant supply of cogeneration units on comparable terms. However, in the event of a change in suppliers, there could be a delay in obtaining units which could result in a temporary slowdown of installing additional income producing sites. The Company believes there are sufficient alternative vendors available to ensure a constant supply of maintenance and installation services on comparable terms. However, in the event of a change of vendor, there could be a delay in installation or maintenance services.
	Property Plant and Equipment
	Property and equipment are stated at cost. Depreciation and amortization are computed using the straight-line method at rates sufficient to write off the cost of the applicable assets over the shorter of the estimated useful life or the contract term. Repairs and maintenance are expensed as incurred.
	The Company reviews the useful life of its energy systems on a quarterly basis or whenever events or changes in business circumstances indicate that the carrying value of the assets may not be fully recoverable or that the useful lives of the assets will no longer be appropriate. The Company evaluates the recoverability of its long-lived assets when impairment indicators exist by comparing the net book value of the assets to the estimated future undiscounted cash flows attributable to such assets. If impairment is indicated, the asset is written down to its estimated fair value based on a discounted cash flow analysis.
	Stock-Based Compensation
	Stock-based compensation cost is measured at the grant date based on the estimated fair value of the award and is recognized as an expense in the consolidated statements of operations over the requisite service period. The fair value of stock options granted is estimated using the Black-Scholes option pricing valuation model. The Company recognizes compensation on a straight-line basis for each separately vesting portion of the option award. Use of a valuation model requires management to make certain assumptions with respect to selected model inputs. Expected volatility was calculated based on the average volatility of 5 companies in the same industry as the Company. The average expected life is estimated using the simplified method for “plain vanilla” options. The simplified method determines the expected life in years based on the vesting period and contractual terms as set forth when the award is made. The Company uses the simplified method for awards of stock-based compensation since it does not have the necessary historical exercise and forfeiture data to determine an expected life for stock options. The risk-free interest rate is based on United States Treasury zero-coupon issues with a remaining term which approximates the expected life assumed at the date of grant. When options are exercised the Company normally issues new shares.
	See “Note 4 – Stockholders’ equity” for a summary of the stock option activity under our 2011 Stock Incentive Plan, as amended, and the UK Sub-Plan for the periods ending March 31, 2014 and 2013, respectively.
	Loss per Common Share
	The Company computes basic loss per share by dividing net loss for the period by the weighted-average number of shares of Common Stock outstanding during the period. The Company computes its diluted earnings per common share using the treasury stock method. For purposes of calculating diluted earnings per share, the Company considers its shares issuable in connection with stock options and warrants to be dilutive Common Stock equivalents when the exercise price is less than the average fair market value of the Company’s Common Stock for the period. For the period ending March 31, 2014, the Company excluded 13,199,190 anti-dilutive shares resulting from the exercise of stock options, warrants and debentures, and for the period ended December 31, 2013, the Company excluded 6,315,252 anti-dilutive shares resulting from the exercise of stock options, warrants and debentures.
	Other Comprehensive Net Loss
	The comprehensive net loss for the periods ending March 31, 2014 and 2013, respectively, does not differ from the reported loss.
	Income Taxes
	As part of the process of preparing its consolidated financial statements, the Company is required to estimate its income taxes in each of the jurisdictions in which the Company operates. This process involves the Company estimating its actual current tax exposure together with assessing temporary differences resulting from differing treatment of items, such as depreciation and certain accrued liabilities for tax and accounting purposes. These differences result in deferred tax assets and liabilities, which are included within the Company’s consolidated balance sheets. The Company must then assess the likelihood that its deferred tax assets will be recovered from future taxable income and to the extent the Company believes that recovery is not likely, the Company must establish a valuation allowance.
	The Company uses a comprehensive model for the recognition, measurement and financial statement disclosure of uncertain tax positions. Unrecognized benefits are the differences between tax positions taken, or expected to be taken in tax returns and the benefits recognized for accounting purposes.
	Impact of New Accounting Pronouncements
	Management does not believe that any recently issued accounting pronouncements or issued but yet effective accounting standards if currently adopted would have a material effect on the accompanying financial statements.

Inventory

Inventory	3 Months Ended
	Mar. 31, 2014
Inventory Disclosure [Abstract]	'
Inventory	'
	Inventory:
	As of March 31, 2014 and December 31, 2013, the Company had $14,115 and $385,660, respectively, in inventory which consisted of finished goods. As of March 31, 2014 and December 31, 2013, there were no reserves or write downs recorded against inventory.

Convertible_debentures_Notes

Convertible debentures (Notes)	3 Months Ended
	Mar. 31, 2014
Debt Disclosure [Abstract]	'
Convertible debentures	'
	Convertible debentures:
	On June 14, 2013, the Company entered into subscription agreements with certain investors, including American DG Energy for a private placement of an aggregate principal amount of $4,000,000 of 4.00% Senior Unsecured Convertible Notes Due 2015, or the Notes. In connection with the private placement, American DG Energy exchanged a promissory note in the aggregate principal amount of $1,100,000, originally issued on February 26, 2013, or the Old Note, for a like principal amount of the Notes and cash paid for any accrued but unpaid interest on the Old Note.
	The holders of the Notes are subject to and entitled to the benefits of the 4% Senior Convertible Notes due 2015 Noteholders Agreement, dated June 14, 2013, or the Noteholders Agreement. The Notes will mature on June 14, 2015 and will accrue interest at the rate of 4.0% per annum payable in cash on a semi-annual basis. At the Investor's option, the Notes may be converted into shares of the Company's common stock at an initial conversion rate of 1,000 shares of common stock per $1,000 principal amount of Notes, subject to adjustment. At the scheduled maturity date, each of the Investors will have the following options: request payment of their principal amount and accrued interest in cash; extend the term of the Notes for an additional 3 years with an automatic decrease in interest rate to 3.0% per annum; or exchange the Notes for a new non-convertible note with a 3 year maturity and a 6.0% per annum interest rate; no accrued interest will be lost on such exchange. The Company has evaluated the term-extending option and has determined that the extension option on the Notes represents a derivative under ASC 815-15-25-44 however, it has concluded that its value at inception and at March 31, 2014 was de minimis based on the current rising interest rate environment; the improving U.S. economy and the potential end of Federal Reserve bond purchases; and current market yields of convertible debentures with maturities similar to ours.
	The Notes are guaranteed on a subordinated basis by American DG Energy.
	The Noteholders Agreement provides for customary events of default by the Company, including failure to pay interest within ten days of becoming due, failure to pay principal when due, failure to comply provisions of the Notes or the Noteholders Agreement, subject to cure, and certain events of bankruptcy or insolvency.
	The holders of the Notes are entitled to the benefits of a registration rights agreement dated June 14, 2013 by and among the Company and the Noteholders named therein, or the Registration Rights Agreement. The Registration Rights Agreement provides for demand registration rights, such that upon the demand of 30.0% of the holders of Registrable Securities, as defined in the Registration Rights Agreement and subject to certain conditions (including that the Company is eligible to use a Form S-3 registration statement and that such holders anticipate an aggregate offering price, net of selling expenses, of at least $250,000), the Company will file a Form S-3 registration statement covering the Registrable Securities requested to be included in such registration, subject to adjustment, and use its commercially reasonable efforts to cause such registration statement to become effective. For additional disclosure see the Company's filings with the SEC.
	Included among the investors subscribing for the Notes are: Bruno Meier, a director of the Company, in the amount of $250,000; Prime World Inc., a company controlled by Joan Giacinti, one of the Company's directors, in the amount of $300,000; Charles T. Maxwell, Chairman of the Board of Directors of American DG Energy, in the amount of $250,000; and Nettlestone Enterprises Limited, a shareholder of both the Company and American DG Energy, in the amount of $300,000.
	The proceeds of the offering of the Notes will be used in connection with the development and installation of current and new energy systems, business development and for general corporate purposes.
	On February 20, 2014 the Company entered into a Note Exchange Agreement with American DG Energy, Inc. and other investors whereby the parties agreed to exchange the $4,000,000 of 4.00% Senior Unsecured Convertible Notes Due 2015 for New Notes. The effect of the Note Exchange agreement (a) extended the maturity date from June 14, 2015 to June 14, 2017, (b) adjusted the conversion price of the notes which changed from 1,000 shares of the Company’s Common Stock for each $1,000 of principal converted to 1,667 shares of the Company’s Common Stock for each $1,000 of principal converted, and (c) eliminated the Holders’ options to extend the Notes.  Management analyzed the impact of the Note Exchange Agreement and determined that the Notes and the New Notes were substantially different and, as a result, has recognized a loss on extinguishment of $713,577 to recognize the excess of the fair value of the New Notes that were issued in the exchange over the carrying value of the Notes surrendered as well as debt issue costs. As a result of the application of extinguishment accounting, the Company has recorded the New Debt at fair value as of the date of the exchange. Because fair value of the debt is $4,656,000 and the carrying value was $4,000,000, a premium of $656,000 was established. The Company will apply the interest method of accounting to amortize the premium over the life of the New Note. The fair value of the New Notes was determined using a binomial lattice model.  The following table provides quantitative information used in the valuation of the fair value measurement, including the assumptions for the significant unobservable inputs used in the
	binomial lattice model valuation:
	Notional amount	$4,000
	Par amount	$1,000
	Interest rate	4	%
	Conversion ratio	1,667
	Conversion price, per share	$0.60
	Stock price as of the valuation date	$0.51
	Historical realized weekly volatility	87	%
	Risk free rate	0.9	%
	Discrete dividend payment rate	—	%
	Significant increases (decreases) in the significant unobservable inputs used in the fair value measurement of the New Notes would result in a significantly higher (lower) fair value measurement.

Stockholders_equity

Stockholders' equity	3 Months Ended
	Mar. 31, 2014
Stockholders' Equity Note [Abstract]	'
Stockholders' Equity	'
	Stockholders’ equity:
	Common Stock
	In 2011 the Company raised $1,148,401, net of costs, in a private placement by issuing 1,250,000 shares of Common Stock to four accredited investors at a price of $1.00 per share.
	On February 10, 2012, the Company announced that its Board of Directors declared a stock dividend of 10% per share on the outstanding shares of our Common Stock. The dividend was payable on March 12, 2012, to common stockholders of record at the close of business on February 24, 2012, except for shares held by American DG Energy, whose Board of Directors declined the dividend. The Company adjusted the price of its outstanding stock option awards and warrants to $0.90 per share due to the payment of the dividend. The Company retroactively applied this dividend to the December 31, 2011, financial statements. Prior to that transaction, the Company had paid no cash or stock dividends on its Common Stock. The Company currently expects to retain earnings for use in the operation and expansion of its business, and therefore does not anticipate paying any cash dividends in the foreseeable future.
	On November 30, 2012, the Company entered into subscription agreements with selected investors for the purchase of units consisting, in the aggregate, of 1,510,000 shares of its Common Stock and warrants to purchase 1,510,000 shares of its Common Stock. The subscription agreements provided for the purchase of the units at a purchase price of $1.00 per unit, and the warrants at an exercise price of $1.00 per share of Common Stock and an expiration date of November 30, 2013. Scarsdale Equities LLC, or Scarsdale, acted as placement agent, on a reasonable efforts basis, for the offering and received a placement fee in cash equal to 6.5% of the gross proceeds of the offering and 65,650 warrants with an exercise price of $1.00 per share of Common Stock that expire on November 30, 2013. The fair value of the warrants granted was estimated to be $7,738 using the Black-Scholes option pricing valuation model and was recorded in stockholder's equity in additional paid-in capital and as a cost of the financing as a deduction to the proceeds raised. The Company also reimbursed certain expenses incurred by Scarsdale in the offering. The offering was made pursuant to our registration statement on Form S-1, which became effective on October 24, 2012.
	Also, on November 30, 2012, the Company entered into subscription agreements with selected investors for a private placement of units consisting, in the aggregate, of 875,000 shares of its Common Stock and warrants to purchase 875,000 shares of its Common Stock. The subscription agreements provided for the purchase of the units at a purchase price of $1.00 per unit, and the warrants at an exercise price of $1.00 per share of Common Stock and an expiration date of November 30, 2013. Scarsdale acted as placement agent, on a reasonable efforts basis, for the offering and received a placement fee in cash equal to 6.5% of the gross proceeds of the offering and 56,875 warrants with an exercise price of $1.00 per share of Common Stock that expire on November 30, 2013. The fair value of the warrants granted was estimated to be $6,703 using the Black-Scholes option pricing valuation model and was recorded in stockholders' equity in additional paid-in capital and as a cost of the financing as a deduction to the proceeds raised. The Company also reimbursed certain expenses incurred by Scarsdale in the offering.
	The holders of Common Stock have the right to vote their interest on a per share basis. At March 31, 2014, there were 56,747,100 shares of Common Stock outstanding.
	On July 2, 2013, American DG Energy declared a special dividend of one share of EuroSite Power common stock for every ten shares of American DG Energy common stock. The special dividend was paid on August 15, 2013, to stockholders of record as of the close of business on July 25, 2013. In connection with this transaction American DG Energy issued to its stockholders an aggregate of 4,880,679 shares of EuroSite Power common stock that it owned. The EuroSite Power shares distributed pursuant to the special dividend are not restricted securities in the hands of shareholders who are not affiliates of American DG Energy or EuroSite Power. Affiliates may sell the securities only after a 6 month holding period pursuant to the provisions of the SEC's Rule 144.
	Stock-Based Compensation
	In January 2011, the Company adopted the 2011 Stock Incentive Plan, or the Plan, under which the Board of Directors may grant up to 3,000,000 shares of incentive or non-qualified stock options and stock grants to key employees, directors, advisors and consultants of the Company. On June 13, 2011, the Board of Directors unanimously amended the Plan, to increase the reserved shares of Common Stock issuable under the Plan from 3,000,000 to 4,500,000, or the Amended Plan.
	Stock options vest based upon the terms within the individual option grants, usually over a four year period with an acceleration of the unvested portion of such options upon a liquidity event, as defined in the Company’s stock option agreement. The options are not transferable except by will or domestic relations order. The option price per share under the Amended Plan is not less than the fair value of the shares on the date of the grant. The number of securities remaining available for future issuance under the Amended Plan was 475,000 at March 31, 2014.
	On January 15, 2011, the Company granted nonqualified options to purchase 2,100,000 shares of Common Stock to five employees and two directors at a purchase price of $1.00 per share. Those options have a vesting schedule of four years and expire in ten years. The assumptions used in the Black-Scholes option pricing model include an expected life of 6.25 years, a risk-free interest rate of 2.7% and an expected volatility of 32.8%. The fair value of the options issued was $790,908, with a grant date fair value of $0.38 per option.
	On June 13, 2011, the Company granted nonqualified options to purchase 300,000 shares of Common Stock to three directors at a purchase price of $1.00 per share. Those options have a vesting schedule of four years and expire in ten years. The assumptions used in the Black-Scholes option pricing model include an expected life of 6.25 years, a risk-free interest rate of 2.3% and an expected volatility of 32.4%. The fair value of the options issued was $109,304, with a grant date fair value of $0.36 per option.
	On November 3, 2011, the Company granted its managing director options to purchase 900,000 shares of common stock at purchase price of $1.00 per share and granted to the three members of its advisory board options to purchase 300,000 shares of common stock at purchase price of $1.00 per share. Those options have a vesting schedule of four years and expire in ten years and were made under the UK Sub-Plan to the Company’s 2011 Stock Incentive Plan. The assumptions used in the Black-Scholes option pricing model include an expected life of 6.25 years, a risk-free interest rate of 1.5% and an expected volatility of 33.1%. The fair value of the options issued was $423,400, with a grant date fair value of $0.35 per option.
	On March 12, 2012, in connection with the 10% stock dividend declared on the Company’s common stock, all outstanding stock option awards were modified in accordance with the plan in order to adjust the exercise price to $0.90.
	On March 20, 2013, the Company granted to a director options to purchase 100,000 shares of Common Stock, plus an additional grant of 118,000 options to purchase shares of Common Stock at a purchase price of $0.90 per share. Those options have a vesting schedule of four years and expire in ten years. The assumptions used in the Black-Scholes option pricing model include an expected life of 6.25 years, a risk-free interest rate of 1.28% and an expected volatility of 36.4%. The fair value of the options issued was $74,049, with a grant date fair value of $0.34 per option.
	On September 30, 2013 the Company granted to employees options to purchase 20,000 shares of Common Stock at a purchase price of $0.45 per share. Those options have a vesting schedule of four years and expire in ten years. The assumptions used in Black-Scholes option pricing model include an expected life of 6.25 years, a risk-free interest rate of 2.02% and an expected volatility of 36.44%. The fair value of the options issued was $3,534 .
	On October 15, 2013 the Company granted to an officer of the Company options to purchase 200,000 shares of Common Stock at a purchase price of $0.41 per share. Those options have a vesting schedule of four years and expire in ten years. The assumptions used in Black-Scholes option pricing model include an expected life of 6.25 years, a risk-free interest rate of 2.11% and an expected volatility of 36.44%. The fair value of the options issued was $32,353.
	During the three month period ending March 31, 2014, the Company had 4,025,000 options outstanding and recognized employee non-cash compensation expense of $47,896 related to the issuance of those stock options. At March 31, 2014, the total compensation cost related to unvested stock option awards not yet recognized was $173,500. This amount will be recognized over the weighted average period of 1.7 years. Stock option activity as of and for the three month period ending March 31, 2014 was as follows:
	Common Stock Options	Number of	Exercise		Weighted		Weighted	Aggregate
		Options	Price		Average		Average	Intrinsic
			Per		Exercise		Remaining	Value
			Share		Price		Life
	Outstanding, December 31, 2013	4,025,000	$	0.87	$	0.87	7.6 years	74,000
	Granted	—	—		—
	Exercised	—	—		—
	Canceled	—	—		—
	Expired	—	—		—
	Outstanding, March 31, 2014	4,025,000	$	0.87	$	0.87	7.3 years	$	21,200
	Exercisable, March 31, 2014	2,371,250			$	0.9		$	—
	Vested and expected to vest, March 31, 2014	4,025,000			$	0.87		$	21,200
	The aggregate intrinsic value of options outstanding as of March 31, 2014, is calculated as the difference between the exercise price of the underlying options and the price of the Company’s Common Stock for options that were in-the-money as of that date. Options that were not in-the-money as of that date, and therefore have a negative intrinsic value, have been excluded from this amount. At March 31, 2014 there were 1,653,750 unvested stock options vesting over 1.7 years.

Earnings_per_share

Earnings per share	3 Months Ended
	Mar. 31, 2014
Earnings Per Share [Abstract]	'
Earnings Per Share	'
	Earnings per share:
	Basic and diluted earnings per share for the three month periods ended March 31, 2014 and 2013, respectively was as follows:
		Three Months
		March 31,			March 31,
		2014			2013
	Earnings per share
	Loss available to stockholders	$	(1,034,669	)	$	(404,742	)
	Weighted average shares outstanding - Basic and diluted	56,747,100			56,747,100
	Basic and diluted loss per share	$	(0.02	)	$	(0.01	)
	Shares underlying warrants outstanding	2,507,525			2,507,525
	Shares underlying stock options outstanding	4,025,000			3,808,000
	Shares underlying convertible debentures outstanding	6,666,665			—

Related_parties

Related parties	3 Months Ended
	Mar. 31, 2014
Related Party Transactions [Abstract]	'
Related Parties	'
	Related parties:
	American DG Energy, the Company's parent, Tecogen, Ilios Inc., or Ilios, GlenRose Instruments Inc., or GlenRose Instruments, Pharos LLC, or Pharos, and Levitronix Technologies LLC, or Levitronix are affiliated companies by virtue of common ownership. The business of GlenRose Instruments, Pharos and Levitronix is not related to the business of the Company. The common stockholders include:
	•	John N. Hatsopoulos who is the Chairman of the Company who holds 0.1% of its common stock is also: (a) the Chief Executive Officer and director of American DG Energy and holds 10.7% of that company’s common stock; (b) the Chief Executive Officer and director of Tecogen and holds 24.5% of that company’s common stock; (c) a director of Ilios and holds 7.2% of that company’s common stock; and (d) the Chairman of GlenRose Instruments and holds 15.7% of that company’s common stock.
	•	Dr. George N. Hatsopoulos, who is John N. Hatsopoulos’ brother, who holds 0.3% of the Company's common stock is also: (a) holds 13.6% of of American DG Energy’s common stock; (b) a director of Tecogen and holds 23.5% of that company’s common stock; (c) an investor in Ilios and holds 3.1% of that company’s common stock; and (d) an investor of GlenRose Instruments and holds 15.7% of that company’s common stock.
	The Company expects to purchase the majority of its energy equipment from American DG Energy, its parent. American DG Energy owns 70.7% of the Common Stock of the Company. American DG Energy purchases energy
	equipment primarily from Tecogen which manufactures natural gas, engine-driven commercial and industrial cooling and cogeneration systems, and from Ilios which is developing a line of ultra-high-efficiency heating products, such as a high efficiency water heater, that provides twice the efficiency of conventional boilers, based on management estimates, for commercial and industrial applications utilizing advanced thermodynamic principles.
	On October 20, 2009, American DG Energy, in the ordinary course of its business, signed a Sales Representative Agreement with Ilios to promote, sell and service the Ilios high-efficiency heating products, such as the high efficiency water heater, in the marketing territory of the New England states, including Connecticut, Rhode Island, Massachusetts, New Hampshire, Vermont, and Maine. The marketing territory also includes all of the nations in the European Union. The initial term of this Agreement is for five years, after which it may be renewed for successive one year terms upon mutual written agreement. On August 12, 2013, under mutual consent, the agreement was modified to exclude the marketing territory of the nations in the European Union. The other terms of the agreement remained the same.
	American DG Energy signed a Facilities and Support Services Agreement with Tecogen on July 1, 2013. The term of the agreement commences as of the start of each year and certain portions of the agreement, including office space allocation, get renewed annually upon mutual written agreement.
	The Company purchases energy systems from American DG Energy and ships them to the United Kingdom. At March 31, 2014 and December 31, 2013, the Company had an inventory balance of $14,115 and $385,660, respectively, consisting of energy systems purchased from American DG Energy.
	On February 26, 2013, the Company received financing in the amount of $1,100,000 from American DG Energy, its parent. Under the terms of the agreement the Company was to pay interest at a rate of 6.0% per annum payable quarterly in arrears.
	On June 14, 2013, the Company entered into subscription agreements with certain investors, including American DG Energy for a private placement of an aggregate principal amount of $4,000,000 of 4.00% Senior Unsecured Convertible Notes Due 2015. In connection with the private placement, American DG Energy exchanged a promissory note in the aggregate principal amount of $1,100,000, originally issued on February 26, 2013, for a like principal amount of the Notes and cash paid for any accrued but unpaid interest on the Old Note. Included among the investors subscribing for the Notes are: Bruno Meier, a director of the Company, in the amount of $250,000; Prime World Inc., a company controlled by Joan Giacinti, one of the Company's directors, in the amount of $300,000; Charles T. Maxwell, Chairman of the Board of Directors of American DG Energy, in the amount of $250,000; and Nettlestone Enterprises Limited, a shareholder of both the Company and American DG Energy, in the amount of $300,000. The proceeds of the offering of the Notes will be used in connection with the development and installation of current and new energy systems, business development and for general corporate purposes.
	On February 20, 2014 the Company entered into a Note Exchange Agreement with American DG Energy, Inc. and other investors whereby both parties agreed to exchange the $4,000,000 of 4.00% Senior Unsecured Convertible Notes Due 2015 for New Notes. The "Stated Maturity" of the Notes as set forth therein changed from June 14, 2014 to June 14, 2017; the "Initial Conversion Rate" of the Notes as set forth therein changed from 1,000 shares of the Company's Common Stock for each $1,000 of principal converted to 1,667 shares of the Company's Common Stock for each $1,000 of principal converted; and the Holders' of options to extend the Notes were eliminated.
	John N. Hatsopoulos is the Company’s Chairman of the Board and is also the Chief Executive Officer of American DG Energy and Tecogen, and the Chairman of GlenRose Instruments. His salary is $1.00 per year. On average, Mr. Hatsopoulos spends approximately 20% of his business time on the affairs of the Company, but such amount varies widely depending on the needs of the business and is expected to increase as the business of the Company develops.
	Barry J. Sanders, the Company’s Chief Executive Officer, is also the President and Chief Operating Officer of American DG Energy and devotes part of his business time to the affairs of American DG Energy. His salary is paid by American DG Energy but a portion is reimbursed by the Company according to the requirements of the business in a given week at a fully burdened hourly rate of $123. On average, Mr. Sanders spends approximately 25% of his business time on the affairs of the Company, but such amount varies widely depending on the needs of the business and is expected to increase as the business of the Company develops.
	Jesse T. Herrick, who was the Company’s Chief Financial Officer, devoted part of his business time to the affairs of American DG Energy. His salary was paid by American DG Energy but a portion is reimbursed by the Company according to the requirements of the business in a given week at a fully burdened hourly rate of $80. On average, Mr. Herrick spent approximately 15% of his business time on the affairs of the Company, but such amount varied widely depending on the needs of the business. On February 18, 2014, Jesse T. Herrick resigned, effective March 31, 2014, from his positions as Chief Financial Officer, Secretary and Treasurer of American DG Energy Inc. and EuroSite Power Inc..On March 31, 2014, Jesse T. Herrick amended and restated the terms of his February 18, 2014 resignation letter to the Company. Pursuant to such amended and restated resignation letter, Mr. Herrick’s resignation from his positions as Chief Financial Officer, Secretary and Treasurer of the Company, and any other positions he may have had with the Company and will become effective April 11, 2014.
	The Company’s headquarters are located in Waltham, Massachusetts and consist of 3,282 square feet of office and storage space that are leased from Tecogen and shared with American DG Energy. The lease expires on March 31, 2014 and is a month to month lease thereafter. American DG Energy is currently charging the Company for utilizing its share of office space in the United States through an intercompany service charge. The Company also occupies a small office space in the United Kingdom. The Company believes that its facilities are appropriate and adequate for its current needs.

Fair_value_measurements

Fair value measurements	3 Months Ended
	Mar. 31, 2014
Fair Value Disclosures [Abstract]	'
Fair value measurements	'
	Fair value measurements:
	The fair value topic of the FASB Accounting Standards Codification defines fair value as the exchange price that would be received for an asset or paid to transfer a liability (an exit price) in the principal or most advantageous market for the asset or liability in an orderly transaction between market participants on the measurement date. The accounting guidance also establishes a fair value hierarchy which requires an entity to maximize the use of observable inputs, where available, and minimize the use of unobservable inputs when measuring fair value. There are three levels of inputs that may be used to measure fair value:
	Level 1 — Quoted prices in active markets for identical assets or liabilities that the entity has the ability to access at the measurement date. The Company currently does not have any Level 1 financial assets or liabilities.
	Level 2 — Observable inputs other than Level 1 prices, such as quoted prices for similar assets or liabilities; quoted prices in markets that are not active; or other inputs that are observable or can be corroborated by observable market data for substantially the full term of the assets or liabilities. The Company currently does not have any Level 2 financial assets or liabilities.
	Level 3 — Unobservable inputs that are supported by little or no market activity and that are significant to the fair value of the assets or liabilities. The Company currently does not have any Level 3 financial assets or liabilities.
	At March 31, 2014, the Company has no financial instruments that are required to be recorded at fair value on a recurring basis. The Company’s financial instruments include cash and cash equivalents and accounts payable whose recorded values approximate fair value based on their short term nature.
	The  carry value of the convertible debentures are at fair value based upon an estimate performed for the February 20, 2014 exchange of debentures. See "Note 3 - Convertible debentures" for further detail.

Subsequent_events

Subsequent events	3 Months Ended
	Mar. 31, 2014
Subsequent Events [Abstract]	'
Subsequent Events	'
	Subsequent events:
	On March 31, 2014, Jesse T. Herrick amended and restated the terms of his February 18, 2014 resignation letter to the Company. Pursuant to such amended and restated resignation letter, Mr. Herrick’s resignation from his positions as Chief Financial Officer, Secretary and Treasurer of the Company, and any other positions he may have had with the Company and will become effective April 11, 2014.
	On April 15, 2014, the Company, entered into a subscription agreement with a European investor for the sale of a $300,000, 4% Senior Convertible Note Due 2018. The Note will mature on April 15, 2018 and will accrue interest at the rate of 4% per annum payable on a semi-annual basis. At the holder’s option, the Note may be converted into shares of the Company’s common stock at a conversion price of $0.60 per share, subject to adjustment in certain circumstances. The proceeds of the Note will be used in connection with the development and installation of current and new energy systems, business development and for general corporate purposes.
	On April 24, 2014, the Company, entered into a subscription agreement with a European investor for the sale of a $300,000, 4% Senior Convertible Note Due 2018. The Note will mature on April 24, 2018 and will accrue interest at the rate of 4% per annum payable on a semi-annual basis. At the holder’s option, the Note may be converted into shares of the Company’s common stock at a conversion price of $0.60 per share, subject to adjustment in certain circumstances. The proceeds of the Note will be used in connection with the development and installation of current and new energy systems, business development and for general corporate purposes.
	On April 24, 2014, the Company entered into a subscription agreement with John N. Hatsopoulos, the chairman of the Company's Board of Directors, for the sale of a $300,000, 4% Senior Convertible Note Due 2018. The Note will mature on April 24, 2018 and will accrue interest at the rate of 4% per annum payable on a semi-annual basis. At the holder’s option, the Note may be converted into shares of the Company’s common stock at a conversion price of $0.60 per share, subject to adjustment in certain circumstances. The proceeds of the Note will be used in connection with the development and installation of current and new energy systems, business development and for general corporate purposes.
	These securities were offered and sold to the Investors in private placement transactions made in reliance upon exemptions from registration pursuant to Section 4(a)(2) under the Securities Act of 1933 and Rule 506 promulgated thereunder. The Investors are accredited investor as defined in Rule 501 of Regulation D promulgated under the Securities Act of 1933.
	On April 24, 2014, the Board of Directors of the Company, elected Mr. Gabriel Parmese, age 54, the Company's Chief Financial Officer, Secretary, and Treasurer effective May 7, 2014.

Description_of_business_and_su1

Description of business and summary of significant accounting policies (Policies)	3 Months Ended
	Mar. 31, 2014
Accounting Policies [Abstract]	'
Description Of Business	'
	Description of Business
	EuroSite Power Inc., or the Company, we, our or us, distributes, owns and operates clean, on-site energy systems that produce electricity, hot water, heat and cooling in the United Kingdom and Europe. Our business model is to own the equipment it installs at customers’ facilities and to sell the energy produced by these systems to the customers on a long-term contractual basis at prices guaranteed to the customer to be below conventional utility rates. We call this business the EuroSite Power “On-Site Utility.”
	The Company was incorporated as a Delaware corporation on July 9, 2010 as a subsidiary of American DG Energy Inc., or American DG Energy, to introduce the American DG Energy On-Site Utility solution into the United Kingdom and the European market.
Principles Of Consolidation and Basis Of Presentation	'
	Principles of Consolidation and Basis of Presentation
	The unaudited condensed consolidated financial statements, or the Unaudited Financial Statements, presented herein have been prepared by the Company, without audit, and, in the opinion of management, reflect all adjustments (consisting of normal recurring adjustments) necessary for a fair statement of the interim periods presented. The accompanying unaudited interim condensed consolidated financial statements have been prepared in accordance with accounting principles generally accepted in the United States of America, or GAAP, for interim financial information and pursuant to the rules and regulations of the Securities And Exchange Commission, or SEC, for reporting in this Quarterly Report on Form 10-Q, or the Quarterly Report. Accordingly, certain information and footnote disclosures required for complete financial statements are not included herein. It is suggested that the Unaudited Financial Statements be read in conjunction with the consolidated financial statements and notes included in the Company’s Form 10-K for the fiscal year ended December 31, 2013. The Company’s operating results for the three month period ended March 31, 2014, may not be indicative of the results expected for any succeeding interim periods or for the entire year ending December 31, 2014.
	The accompanying consolidated financial statements include the accounts of the Company and its wholly-owned subsidiary EuroSite Power Limited, a United Kingdom registered company.
	On July 9, 2010, American DG Energy invested $45,000 in exchange for 45 million shares of the Company’s common stock, par value $.001 per share, or Common Stock, and obtained controlling interest in the Company. Also on July 9, 2010, Nettlestone Enterprises Limited, invested $5,000 in exchange for 5 million shares of the Company’s Common Stock. As of March 31, 2014, American DG Energy owned a 70.7% interest in the Company and consolidates the Company into its financial statements in accordance with GAAP.
	The Company’s operations are comprised of one business segment. The Company’s business is to sell energy in the form of electricity, heat, hot water and cooling to its customers under long-term sales agreements. Occasionally the company will sell equipment or services to interested parties. All of the Company's revenue is generated in the United Kingdom. All of the Company's long lived assets are located in the United Kingdom.
	The Company has experienced total net losses since inception of $5.9 million. For the foreseeable future, the Company expects to experience continuing operating losses and negative cash flows from operations as its management executes its current business plan. The Company believes that its existing resources, including cash and cash equivalents, future cash flow from operations, its ability to control certain costs, including those related to general and administrative expenses, and the use of capital from its parent company, will be sufficient to meet the working capital requirements of its existing business for the foreseeable future, including the next 12 months; however, as the Company continues to grow its business by adding more energy systems, the cash requirements will increase. Beyond March 31, 2015, the Company may need to raise additional capital through debt financing or use capital provided by its parent to meet its operating and capital needs.There can be no assurance, however, that the Company will be successful in these fund-raising efforts or that additional funds will be available on acceptable terms, if at all.
	Since its inception to March 31, 2014, the Company has raised a total of $5,896,000 through various private placements of Common Stock. If the Company is unable to raise additional capital, the Company may need to terminate certain of its employees and adjust its current business plan. Financial considerations may cause the Company to modify planned deployment of new energy systems and the Company may decide to suspend installations until it is able to secure additional working capital. The Company will evaluate possible acquisitions of, or investments in, businesses, technologies and products that are complementary to its business; however, the Company is not currently engaged in such discussions.
	The following significant accounting policies are either currently in effect or are anticipated to become effective as the Company commences its normal business activities.
Foreign Currency Transactions	'
	Foreign Currency Transactions
	The functional currency and the reporting currency of the Company and subsidiary are the U.S. dollar. Transactions denominated in foreign currencies are translated into U.S. dollars at the exchange rate in effect on the date of the transactions. Exchange gains or losses on transactions are included in the Condensed Consolidated Statements of Operations. Such amounts were immaterial for all periods presented.
Use of Estimates	'
	Use of Estimates
	The preparation of financial statements in conformity with GAAP requires management to make estimates and assumptions that affect the reported amounts of assets and liabilities and disclosure of contingent assets and liabilities at the date of the financial statements and the reported amounts of revenues and expenses during the reporting period. Actual results could differ from those estimates.
Revenue Recognition	'
	Revenue Recognition
	Revenue from energy contracts is recognized when electricity, heat, and chilled water is produced by the cogeneration systems on-site. The Company bills each month based on various meter readings installed at each site. The amount of energy produced by on-site energy systems is invoiced, as determined by a contractually defined formula. Under certain energy contracts, the customer directly acquires the fuel to power the systems and receives credit for that expense from the Company. The credit is recorded as reduction of revenue and as a reduction of fuel cost. Revenues from operation, including shared savings are recorded when provided and verified. Maintenance service revenue is recognized over the term of the agreement and is billed on a monthly basis in arrears.
	As a by-product of the energy business, in some cases, the customer may choose to have the Company construct the system for them rather than have it owned by the Company. In this case, the Company will account for revenue, or turnkey revenue, and costs using the percentage-of-completion method of accounting. Under the percentage-of-completion method of accounting, revenues are recognized by applying percentages of completion to the total estimated revenues for the respective contracts. Costs will be recognized as incurred. The percentages of completion are determined by relating the actual cost of work performed to date to the current estimated total cost at completion of the respective contracts. When the estimate on a contract indicates a loss, the Company's policy is to record the entire expected loss, regardless of the percentage of completion. The excess of contract costs and profit recognized to date on the percentage-of-completion accounting method in excess of billings will be recorded as unbilled revenue. Billings in excess of related costs and estimated earnings will be recorded as deferred revenue. The Company had no such arrangements at March 31, 2014 and 2013, respectively.
	Customers may buy out their long-term obligation under energy contracts and purchase the underlying equipment from the Company. Any resulting gain on these transactions will be recognized over the payment period in the accompanying consolidated statements of operations. The Company had no such arrangements to date.
	Occasionally the Company will enter into a sales arrangement with a customer to construct and sell an energy system and provide energy and maintenance services over the term of the contract. Based on the fact that the Company will sell each deliverable to other customers on a stand-alone basis, the Company will determine that each deliverable has a stand-alone value. Additionally, there are no rights of return relative to the delivered items; therefore, each deliverable will be considered a separate unit of accounting. Revenue will be allocated to each element based upon its relative fair value which is determined based on the estimated price of the deliverables when sold on a standalone basis. Revenue related to the construction of the energy system will be recognized using the percentage-of-completion method as the unit is being constructed. Revenue from the sale of energy will be recognized when electricity, heat, and chilled water is produced by the energy system, and revenue from maintenance services is recognized over the term of the maintenance agreement. The Company had no such arrangements to date.
	The Company may be able to participate in the demand response market and receive payments due to the availability of its energy systems. Demand response programs provide payments for either the reduction of electricity usage or the increase in electricity production during periods of peak usage throughout a utility territory. The Company had not recognized revenue from demand response activity to date.
	Other revenue represents various types of ancillary activities for which the Company expects to engage in from time to time such as the sale of equipment, and feasibility studies.
Cash and Cash Equivalents	'
	Cash and Cash Equivalents
	The Company considers all highly liquid investments with a maturity of three months or less when purchased to be cash equivalents.
Concentration Of Credit Risk	'
	Concentration of Credit Risk
	Financial instruments which potentially subject the Company to concentrations of credit risk consist of highly liquid cash equivalents. The Company has cash balances in certain financial institutions in amounts which occasionally exceed current federal deposit insurance limits. The financial stability of these institutions is continually reviewed by senior management. As of March 31, 2014, the Company had a balance of $1,203,036 in cash and cash equivalents. The Company believes it is not exposed to any significant credit risk on cash and cash equivalents.
Accounts Receivable	'
	Accounts Receivable
	The Company maintains receivable balances with its customers. The Company reviews its customers’ credit history before extending credit and generally does not require collateral. An allowance for doubtful accounts is established based upon factors surrounding the credit risk of specific customers, historical trends and other information. Bad debts are written off when identified by management. At March 31, 2014 and December 31, 2013, there was no allowance for doubtful accounts.
Inventory	'
	Inventory
	Inventories are stated at the lower of cost or market, valued on a first-in, first-out basis. Inventory is reviewed periodically for slow-moving and obsolete items.
Supply Concentrations	'
	Supply Concentrations
	All of the Company’s cogeneration unit purchases for the periods ending March 31, 2014 and 2013, respectively, were from one vendor (see “Note 6 - Related parties”). The Company believes there are sufficient alternative vendors available to ensure a constant supply of cogeneration units on comparable terms. However, in the event of a change in suppliers, there could be a delay in obtaining units which could result in a temporary slowdown of installing additional income producing sites. The Company believes there are sufficient alternative vendors available to ensure a constant supply of maintenance and installation services on comparable terms. However, in the event of a change of vendor, there could be a delay in installation or maintenance services.
Property, Plant and Equipment	'
	Property Plant and Equipment
	Property and equipment are stated at cost. Depreciation and amortization are computed using the straight-line method at rates sufficient to write off the cost of the applicable assets over the shorter of the estimated useful life or the contract term. Repairs and maintenance are expensed as incurred.
	The Company reviews the useful life of its energy systems on a quarterly basis or whenever events or changes in business circumstances indicate that the carrying value of the assets may not be fully recoverable or that the useful lives of the assets will no longer be appropriate. The Company evaluates the recoverability of its long-lived assets when impairment indicators exist by comparing the net book value of the assets to the estimated future undiscounted cash flows attributable to such assets. If impairment is indicated, the asset is written down to its estimated fair value based on a discounted cash flow analysis.
Stock-based Compensation	'
	Stock-Based Compensation
	Stock-based compensation cost is measured at the grant date based on the estimated fair value of the award and is recognized as an expense in the consolidated statements of operations over the requisite service period. The fair value of stock options granted is estimated using the Black-Scholes option pricing valuation model. The Company recognizes compensation on a straight-line basis for each separately vesting portion of the option award. Use of a valuation model requires management to make certain assumptions with respect to selected model inputs. Expected volatility was calculated based on the average volatility of 5 companies in the same industry as the Company. The average expected life is estimated using the simplified method for “plain vanilla” options. The simplified method determines the expected life in years based on the vesting period and contractual terms as set forth when the award is made. The Company uses the simplified method for awards of stock-based compensation since it does not have the necessary historical exercise and forfeiture data to determine an expected life for stock options. The risk-free interest rate is based on United States Treasury zero-coupon issues with a remaining term which approximates the expected life assumed at the date of grant. When options are exercised the Company normally issues new shares.
	See “Note 4 – Stockholders’ equity” for a summary of the stock option activity under our 2011 Stock Incentive Plan, as amended, and the UK Sub-Plan for the periods ending March 31, 2014 and 2013, respectively.
Loss Per Common Share	'
	Loss per Common Share
	The Company computes basic loss per share by dividing net loss for the period by the weighted-average number of shares of Common Stock outstanding during the period. The Company computes its diluted earnings per common share using the treasury stock method. For purposes of calculating diluted earnings per share, the Company considers its shares issuable in connection with stock options and warrants to be dilutive Common Stock equivalents when the exercise price is less than the average fair market value of the Company’s Common Stock for the period. For the period ending March 31, 2014, the Company excluded 13,199,190 anti-dilutive shares resulting from the exercise of stock options, warrants and debentures, and for the period ended December 31, 2013, the Company excluded 6,315,252 anti-dilutive shares resulting from the exercise of stock options, warrants and debentures.
Other Comprehensive Net Loss	'
	Other Comprehensive Net Loss
	The comprehensive net loss for the periods ending March 31, 2014 and 2013, respectively, does not differ from the reported loss.
Income Taxes	'
	Income Taxes
	As part of the process of preparing its consolidated financial statements, the Company is required to estimate its income taxes in each of the jurisdictions in which the Company operates. This process involves the Company estimating its actual current tax exposure together with assessing temporary differences resulting from differing treatment of items, such as depreciation and certain accrued liabilities for tax and accounting purposes. These differences result in deferred tax assets and liabilities, which are included within the Company’s consolidated balance sheets. The Company must then assess the likelihood that its deferred tax assets will be recovered from future taxable income and to the extent the Company believes that recovery is not likely, the Company must establish a valuation allowance.
	The Company uses a comprehensive model for the recognition, measurement and financial statement disclosure of uncertain tax positions. Unrecognized benefits are the differences between tax positions taken, or expected to be taken in tax returns and the benefits recognized for accounting purposes.
Impact of New Accounting Pronouncements	'
	Impact of New Accounting Pronouncements
	Management does not believe that any recently issued accounting pronouncements or issued but yet effective accounting standards if currently adopted would have a material effect on the accompanying financial statements.

Convertible_debentures_Tables

Convertible debentures (Tables)	3 Months Ended
	Mar. 31, 2014
Debt Disclosure [Abstract]	'
Fair Value Measurements	'
	The following table provides quantitative information used in the valuation of the fair value measurement, including the assumptions for the significant unobservable inputs used in the
	binomial lattice model valuation:
	Notional amount	$4,000
	Par amount	$1,000
	Interest rate	4	%
	Conversion ratio	1,667
	Conversion price, per share	$0.60
	Stock price as of the valuation date	$0.51
	Historical realized weekly volatility	87	%
	Risk free rate	0.9	%
	Discrete dividend payment rate	—	%

Stockholders_equity_Tables

Stockholders' equity (Tables)	3 Months Ended
	Mar. 31, 2014
Stockholders' Equity Note [Abstract]	'
Schedule of Share-based Compensation, Stock Options, Activity	'
	Stock option activity as of and for the three month period ending March 31, 2014 was as follows:
	Common Stock Options	Number of	Exercise		Weighted		Weighted	Aggregate
		Options	Price		Average		Average	Intrinsic
			Per		Exercise		Remaining	Value
			Share		Price		Life
	Outstanding, December 31, 2013	4,025,000	$	0.87	$	0.87	7.6 years	74,000
	Granted	—	—		—
	Exercised	—	—		—
	Canceled	—	—		—
	Expired	—	—		—
	Outstanding, March 31, 2014	4,025,000	$	0.87	$	0.87	7.3 years	$	21,200
	Exercisable, March 31, 2014	2,371,250			$	0.9		$	—
	Vested and expected to vest, March 31, 2014	4,025,000			$	0.87		$	21,200

Earnings_per_share_Tables

Earnings per share (Tables)	3 Months Ended
	Mar. 31, 2014
Earnings Per Share [Abstract]	'
Basic and diluted earnings per share	'
	Basic and diluted earnings per share for the three month periods ended March 31, 2014 and 2013, respectively was as follows:
		Three Months
		March 31,			March 31,
		2014			2013
	Earnings per share
	Loss available to stockholders	$	(1,034,669	)	$	(404,742	)
	Weighted average shares outstanding - Basic and diluted	56,747,100			56,747,100
	Basic and diluted loss per share	$	(0.02	)	$	(0.01	)
	Shares underlying warrants outstanding	2,507,525			2,507,525
	Shares underlying stock options outstanding	4,025,000			3,808,000
	Shares underlying convertible debentures outstanding	6,666,665			—

Description_of_business_and_su2

Description of business and summary of significant accounting policies (Details) (USD $)	3 Months Ended	12 Months Ended	27 Months Ended
	Mar. 31, 2014	Dec. 31, 2013	Sep. 30, 2012	Jul. 09, 2010	Jul. 09, 2010
	company			Investments In Majority-Owned Subsidiaries [Member]	Investments In Majority-Owned Subsidiaries [Member]
				American DG [Member]	Nettlestone Enterprises [Member]
Entity Incorporation, Date Of Incorporation	9-Jul-10	'	'	'	'
Investments	'	'	'	$45,000	$5,000
Shares Exchanged	'	'	'	45,000,000	5,000,000
Common stock, par value (in dollars per share)	$0.00	$0.00	'	$0.00	'
Noncontrolling Interest, Ownership Percentage by Parent	70.70%	'	'	'	'
Retained Earnings (Accumulated Deficit)	5,889,705	4,855,036	'	'	'
Proceeds from Issuance of Private Placement	'	'	5,896,000	'	'
Cash, Cash Equivalents, and Short-term Investments	1,203,036	'	'	'	'
Allowance for Doubtful Accounts Receivable	$0	$0	'	'	'
Number of Companies Used to Calculated Average Volatility	5	'	'	'	'
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount	13,199,190	6,315,252	'	'	'

Inventory_Details

Inventory (Details) (USD $)	3 Months Ended	12 Months Ended
	Mar. 31, 2014	Dec. 31, 2012	Dec. 31, 2013
Inventory Disclosure [Abstract]	'	'	'
Inventory	$14,115	'	$385,660
Inventory Valuation Reserves	0	'	0
Inventory Write-down	$0	$0	'

Convertible_debentures_Details

Convertible debentures (Details) (USD $)

3 Months Ended

0 Months Ended

3 Months Ended

Mar. 31, 2014

Mar. 31, 2013

Jun. 14, 2013

Jun. 14, 2013

Jun. 14, 2013

Mar. 31, 2014

Feb. 20, 2014

Mar. 31, 2014

Mar. 31, 2014

Mar. 31, 2014

Mar. 31, 2014

Mar. 31, 2014

Senior Unsecured Convertible Notes Due 2015 [Member]

Unsecured Convertible Debt [Member]

Convertible Debt [Member]

Convertible Debt [Member]

Bruno Meier [Member]

Joan Giacinti [Member]

Charles T. Maxwell [Member]

Nettlestone Enterprises Limited [Member]

American DG Energy [Member]

Senior Unsecured Convertible Notes Due 2015 [Member]

Senior Convertible Notes Due 2017 [Member]

Senior Convertible Notes Due 2017 [Member]

Debt Instrument [Line Items]

'

'

'

'

'

'

'

'

'

'

'

'

Par amount

'

'

'

'

'

$1,000

$4,000,000

'

'

'

'

'

Interest rate

'

'

'

6.00%

4.00%

4.00%

4.00%

'

'

'

'

'

Maximum borrowing capacity

'

'

'

'

'

'

'

250,000

300,000

250,000

300,000

1,100,000

Extension period

'

'

'

'

'3 years

'

'

'

'

'

'

'

Decrease in interest rate

'

'

'

'

-3.00%

'

'

'

'

'

'

'

Debt term

'

'

'

'

'3 years

'

'

'

'

'

'

'

Interest payment term

'10 days

'

'

'

'

'

'

'

'

'

'

'

Registration rights percentage

'

'

30.00%

'

'

'

'

'

'

'

'

'

Offering price, net

'

'

250,000

'

'

'

'

'

'

'

'

'

Debt Instrument, Convertible, Shares

'

'

'

'

'

'

1,667

'

'

'

'

'

Loss on extinguishment of debt

713,577

0

'

'

'

713,577

'

'

'

'

'

'

Long-term Debt, Fair Value

'

'

'

'

'

4,656,000

'

'

'

'

'

'

Notional amount

'

'

'

'

'

4,000,000

'

'

'

'

'

'

Debt Instrument, Unamortized Premium

'

'

'

'

'

$656,000

'

'

'

'

'

'

Convertible_debentures_Fair_Va

Convertible debentures (Fair Value Measurement) (Details) (Convertible Debt [Member], Senior Convertible Notes Due 2017 [Member], USD $)	3 Months Ended
	Mar. 31, 2014	Feb. 20, 2014
Convertible Debt [Member] | Senior Convertible Notes Due 2017 [Member]	'	'
Debt Instrument [Line Items]	'	'
Notional amount	$4,000,000	'
Par amount	$1,000	$4,000,000
Interest rate	4.00%	4.00%
Conversion ratio	1,667	'
Conversion price, per share	$0.60	'
Stock price as of the valuation date	$0.51	'
Historical realized weekly volatility	87.00%	'
Risk free rate	0.90%	'
Discrete dividend payment rate	0.00%	'

Stockholders_equity_Textual_De

Stockholders' equity (Textual) (Details) (USD $)

0 Months Ended

1 Months Ended

3 Months Ended

12 Months Ended

0 Months Ended

1 Months Ended

3 Months Ended

0 Months Ended

1 Months Ended

3 Months Ended

12 Months Ended

1 Months Ended

0 Months Ended

1 Months Ended

0 Months Ended

3 Months Ended

0 Months Ended

3 Months Ended

Oct. 15, 2013

Jul. 02, 2013

Mar. 20, 2013

Jan. 15, 2011

Jan. 15, 2011

Nov. 30, 2011

Jun. 30, 2011

Jan. 31, 2011

Mar. 31, 2014

Sep. 30, 2013

Mar. 31, 2013

Dec. 31, 2012

Dec. 31, 2011

Dec. 31, 2013

Nov. 30, 2012

Dec. 31, 2010

Oct. 15, 2013

Mar. 20, 2013

Nov. 30, 2011

Jun. 30, 2011

Jan. 31, 2011

Sep. 30, 2013

Oct. 15, 2013

Mar. 20, 2013

Nov. 30, 2011

Jun. 30, 2011

Jan. 31, 2011

Sep. 30, 2013

Mar. 31, 2014

Nov. 30, 2012

Dec. 31, 2011

Nov. 30, 2011

Nov. 30, 2012

Nov. 30, 2011

Mar. 20, 2013

Mar. 20, 2013

Sep. 30, 2013

Oct. 15, 2013

Sep. 30, 2013

employee

director

director

director

Maximum [Member]

Maximum [Member]

Maximum [Member]

Maximum [Member]

Maximum [Member]

Maximum [Member]

Minimum [Member]

Minimum [Member]

Minimum [Member]

Minimum [Member]

Minimum [Member]

Minimum [Member]

Warrant [Member]

Common Stock and Warrant [Member]

Stock Compensation Plan [Member]

Scarsdale Equities LLC [Member]

Private Placement [Member]

Private Placement [Member]

Director [Member]

Employee [Member]

Employee [Member]

Executive Officer [Member]

Executive Officer [Member]

Scarsdale Equities LLC [Member]

Stock Issued During Period Value Private Placement

'

'

'

'

'

'

'

'

'

'

'

'

$1,148,401

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Stock Issued During Period Shares Private Placement

'

'

'

'

'

'

'

'

'

'

'

'

1,250,000

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Number Of Accredited Investors

'

'

'

'

'

'

'

'

'

'

'

'

4

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Common stock, par value (in dollars per share)

'

'

'

'

'

'

'

'

$0.00

'

'

'

'

$0.00

'

'

'

'

'

'

'

'

'

'

'

'

'

'

$1

'

'

'

'

'

'

'

'

'

'

Common Stock Dividend Rate Percentage

'

'

'

'

'

'

'

'

10.00%

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

10.00%

'

'

'

'

'

'

'

'

'

'

Dividends Payable, Date to be Paid

'

'

'

'

'

'

'

'

12-Mar-12

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Dividends Payable, Date of Record

'

'

'

'

'

'

'

'

24-Feb-12

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Adjusted Price Of Stock Option Awards and Warrants

'

'

'

'

'

'

'

'

$0.90

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

$0.90

'

'

'

'

'

'

'

'

'

'

Common Stock, Shares Authorized

'

'

'

'

'

'

'

'

100,000,000

'

'

'

'

100,000,000

1,510,000

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Class of Warrant or Right, Number of Securities Called by Warrants or Rights

'

'

'

'

'

'

'

'

'

'

'

'

'

'

1,510,000

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

875,000

'

'

'

'

'

'

Shares Issued, Price Per Share

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

$1

'

'

$1

'

'

'

'

'

'

Class of Warrant or Right, Exercise Price of Warrants or Rights

'

'

'

'

'

'

'

'

'

'

'

'

'

'

1

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

1

'

'

'

'

'

'

Stock Issuance Costs, Percent of Gross Proceeds Placement Fee

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

6.50%

'

6.50%

'

'

'

'

'

Class of Warrant or Right, Warrants Issued

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

65,650

'

56,875

'

'

'

'

'

Class of Warrant or Right, Fair Value of Grants

'

'

'

'

'

'

'

'

'

'

'

'

'

'

7,738

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

6,703

'

'

'

'

'

'

Stock Issued During Period, Shares, New Issues

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

875,000

'

'

'

'

'

'

Common Stock, Shares, Outstanding

'

'

'

'

'

'

'

'

56,747,100

'

'

'

'

56,747,100

'

56,747,100

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Shares issued

'

4,880,679

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Holding period

'

'6 months

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Net of Forfeitures

'

'

'

'

'

900,000

300,000

2,100,000

0

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

3,000,000

'

'

'

100,000

'

20,000

200,000

'

Share-based Compensation Arrangement by Share-based Payment Award, Options, Other Increases (Decreases) in Period, Description

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'3,000,000 to 4,500,000

'

'

'

'

'

'

'

'

Share Based Compensation Arrangement By Share Based Payment Award Options Vested and Expected To Vest Outstanding Contractual Term

'

'

'

'

'

'

'

'

'four year

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Common Stock, Capital Shares Reserved for Future Issuance

'

'

'

'

'

'

'

'

475,000

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Share Based Compensation Arrangement By Share Based Payment Award, Options Issued, Number Of Individuals

'

'

'

5

2

3

3

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Option To Purchase Common Stock

'

'

'

'

'

'

300,000

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

118,000

'

'

'

Weighted Average Exercise Price, Granted

'

'

$0.90

'

'

$1

$1

$1

$0

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

$0.41

$0.45

Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period

'

'

'

'

'

'

'

'

'1 year 8 months 12 days

'

'

'

'

'

'

'

'10 years

'10 years

'10 years

'10 years

'10 years

'10 years

'4 years

'4 years

'4 years

'4 years

'4 years

'4 years

'

'

'

'

'

'

'

'

'

'

'

Weighted Average Remaining Life, Outstanding

'6 years 3 months

'

'6 years 3 months 1 day

'

'

'6 years 3 months

'6 years 3 months

'6 years 3 months

'7 years 3 months 18 days

'6 years 3 months

'

'7 years 7 months 6 days

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Risk Free Interest Rate

2.11%

'

1.28%

'

'

1.50%

2.30%

2.70%

'

2.02%

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Volatility Rate

36.44%

'

36.40%

'

'

33.10%

32.40%

32.80%

'

36.44%

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Share Based Compensation Arrangement By Share Based Payment Fair Value

32,353

'

74,049

'

'

423,400

109,304

790,908

'

3,534

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Weighted Average Grant Date Fair Value

'

'

$0.34

'

'

$0.35

$0.36

$0.38

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Number

'

'

'

'

'

'

'

'

4,025,000

'

'

'

'

4,025,000

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Share-based Compensation

'

'

'

'

'

'

'

'

47,896

'

27,795

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Employee Service Share-based Compensation, Nonvested Awards, Total Compensation Cost Not yet Recognized, Stock Options

'

'

'

'

'

'

'

'

$173,500

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Employee Service Share-based Compensation, Nonvested Awards, Total Compensation Cost Not yet Recognized, Period for Recognition

'

'

'

'

'

'

'

'

'1 year 8 months 12 days

'

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Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested and Expected to Vest, Outstanding, Number

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1,653,750

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Stockholders_equity_Details

Stockholders' equity (Details) (USD $)	0 Months Ended		1 Months Ended			3 Months Ended		12 Months Ended
	Oct. 15, 2013	Mar. 20, 2013	Nov. 30, 2011	Jun. 30, 2011	Jan. 31, 2011	Mar. 31, 2014	Sep. 30, 2013	Dec. 31, 2012
Stockholders' Equity Note [Abstract]	'	'	'	'	'	'	'	'
Number of Options, Outstanding, December 31, 2012	'	'	'	'	'	4,025,000	'	'
Number of Options, Granted	'	'	900,000	300,000	2,100,000	0	'	'
Number of Options, Exercised	'	'	'	'	'	0	'	'
Number of Options, Canceled	'	'	'	'	'	0	'	'
Number of Options, Expired	'	'	'	'	'	0	'	'
Number of Options, Outstanding, September 30,2013	'	'	'	'	'	4,025,000	'	'
Number of Options, Exercisable, September 30, 2013	'	'	'	'	'	2,371,250	'	'
Number of Options, Vested and expected to vest, September 30, 2013	'	'	'	'	'	4,025,000	'	'
Exercise Price Per Share, Outstanding, December 31, 2012	'	'	'	'	'	$0.87	'	'
Exercise Price Per Share, Granted	'	'	'	'	'	$0	'	'
Exercise Price Per Share, Exercised	'	'	'	'	'	$0	'	'
Exercise Price Per Share, Canceled	'	'	'	'	'	$0	'	'
Exercise Price Per Share, Expired	'	'	'	'	'	$0	'	'
Exercise Price Per Share, Outstanding, September 30, 2013	'	'	'	'	'	$0.87	'	'
Weighted Average Exercise Price, Outstanding, December 31, 2012	'	'	'	'	'	$0.87	'	'
Weighted Average Exercise Price, Granted	'	$0.90	$1	$1	$1	$0	'	'
Weighted Average Exercise Price, Exercised	'	'	'	'	'	$0	'	'
Weighted Average Exercise Price, Canceled	'	'	'	'	'	$0	'	'
Weighted Average Exercise Price, Expired	'	'	'	'	'	$0	'	'
Weighted Average Exercise Price, Outstanding, September 30, 2013	'	'	'	'	'	$0.87	'	'
Weighted Average Exercise Price, Exercisable, September 30, 2013	'	'	'	'	'	$0.90	'	'
Weighted Average Exercise Price, Vested and expected to vest, September 30, 2012	'	'	'	'	'	$0.87	'	'
Weighted Average Remaining Life, Outstanding	'6 years 3 months	'6 years 3 months 1 day	'6 years 3 months	'6 years 3 months	'6 years 3 months	'7 years 3 months 18 days	'6 years 3 months	'7 years 7 months 6 days
Aggregate Intrinsic Value, Outstanding, December 31, 2012	'	'	'	'	'	$74,000	'	'
Aggregate Intrinsic Value, Outstanding, September 30, 2013	'	'	'	'	'	21,200	'	'
Aggregate Intrinsic Value, Exercisable, September 30, 2013	'	'	'	'	'	0	'	'
Aggregate Intrinsic Value, Vested and expected to vest, September 30, 2013	'	'	'	'	'	$21,200	'	'

Earnings_per_share_Details

Earnings per share (Details) (USD $)	3 Months Ended
	Mar. 31, 2014	Mar. 31, 2013
Earnings Per Share [Abstract]	'	'
Loss available to stockholders	($1,034,669)	($404,742)
Weighted average shares outstanding - Basic and diluted (in shares)	56,747,100	56,747,100
Basic and diluted loss per share (in dollars per share)	($0.02)	($0.01)
Shares underlying warrants outstanding	2,507,525	2,507,525
Shares underlying stock options outstanding	4,025,000	3,808,000
Shares underlying convertible debentures outstanding	6,666,665	0

Related_parties_Details

Related parties (Details) (USD $)

3 Months Ended

3 Months Ended

0 Months Ended

3 Months Ended

Mar. 31, 2014

Dec. 31, 2013

Mar. 31, 2014

Mar. 31, 2014

Mar. 31, 2014

Mar. 31, 2014

Mar. 31, 2014

Oct. 23, 2009

Mar. 31, 2014

Mar. 31, 2014

Mar. 31, 2014

Mar. 31, 2014

Mar. 31, 2014

Mar. 31, 2014

Mar. 31, 2014

Mar. 31, 2014

Mar. 31, 2014

Mar. 31, 2014

Mar. 31, 2014

Mar. 31, 2014

Feb. 20, 2014

Mar. 31, 2014

Mar. 31, 2014

Mar. 31, 2014

Mar. 31, 2014

sqft

Parent Company [Member]

Board of Directors Chairman [Member]

Chief Executive Officer [Member]

Chief Financial Officer [Member]

American DG Energy [Member]

Ilois [Member]

Chief Executive Officer [Member]

Chief Executive Officer [Member]

Director [Member]

Director [Member]

Director [Member]

Board of Directors Chairman [Member]

Board of Directors Chairman [Member]

Investor [Member]

Investor [Member]

Investor [Member]

Prepayment from Related Party for Future Purchases [Member]

Senior Convertible Notes Due 2017 [Member]

Senior Convertible Notes Due 2017 [Member]

Nettlestone Enterprises Limited [Member]

Joan Giacinti [Member]

Director [Member]

Board of Directors Chairman [Member]

American DG Energy [Member]

Tecogen [Member]

American DG Energy [Member]

Tecogen [Member]

Ilois [Member]

Eurosite [Member]

GlenRose Instruments [Member]

Eurosite [Member]

Ilois [Member]

GlenRose Instruments [Member]

American DG Energy [Member]

Convertible Debt [Member]

Convertible Debt [Member]

Ownernship Interest, Percentage, Related Party

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10.70%

24.50%

13.60%

23.50%

7.20%

0.10%

15.70%

0.30%

3.10%

15.70%

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Percentage Of Shares

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70.70%

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Related Party Transactions Agreement Term

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'5 years

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Related Party Transactions Agreement Term, Renewal Period

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'1 year

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Inventory

$14,115

$385,660

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Maximum borrowing capacity

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1,100,000

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300,000

300,000

250,000

250,000

Related Party Transaction, Discount Rate

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6.00%

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Par amount

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1,000

4,000,000

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Interest rate

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4.00%

4.00%

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Debt Instrument, Convertible, Shares

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1,667

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Officers' Compensation

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1

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Hourly Rate Of Salary Expenditure Reimbursed

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$123

$80

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Percentage Of Time Spent By Related Parties

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20.00%

25.00%

15.00%

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Area of Real Estate Property

3,282

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Lease Expiration Date

31-Mar-14

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Subsequent_events_Details

Subsequent events (Details) (Senior Convertible Note Due 2018 [Member], Convertible Debt [Member], Subsequent Event [Member], USD $)	Apr. 24, 2014	Apr. 15, 2014
Subsequent Event [Line Items]	'	'
Par amount	$300,000	$300,000
Interest rate	4.00%	4.00%
Conversion price, per share	$0.60	$0.60
Director [Member]	'	'
Subsequent Event [Line Items]	'	'
Par amount	$300,000	'
Interest rate	4.00%	'
Conversion price, per share	$0.60	'