Subsequent Events	12 Months Ended
Oct. 31, 2018
Subsequent Events [Abstract]
Subsequent Events	Note 22. Subsequent Events NRG Loan Facility As described in Note 12, the Company has a project finance facility with NRG pursuant to which NRG extended a $40 million revolving construction and term financing facility (the “Loan Facility”) to FuelCell Finance for the purpose of accelerating project development by the Company and its subsidiaries. On December 13, 2018, FuelCell Finance’s wholly owned subsidiary, Central CA Fuel Cell 2, LLC, drew a construction loan advance of $5.8 million under the Loan Facility. This advance will be used to support the completion of construction of the 2.8 MW Tulare BioMAT project in California. This plant is expected to meet its commercial operations date (COD) in March 2019. In conjunction with the December 13, 2018 draw, FuelCell Finance and NRG entered into an amendment to the NRG Agreement (the “Amendment”) to revise the definitions of the terms “Maturity Date” and “Project Draw Period” under the NRG Agreement and to make other related revisions. Prior to the Amendment, FuelCell Finance and its subsidiaries were able to request draws under the Loan Facility through July 30, 2019 and the Maturity Date of each note under the Loan Facility was five years after the first disbursement under such note. Pursuant to the Amendment, FuelCell Finance and its subsidiaries may now request draws only through December 31, 2018 and the Maturity Date of each note is the earlier of (a) March 31, 2019 and (b) the COD (commercial operation date or substantial completion date, as applicable) with respect to the fuel cell project owned by the borrower under such note. There are currently no other drawdowns or outstanding balances under the Loan Facility. Generate Lending Loan Facility On December 21, 2018, the Company, through its indirect wholly-owned subsidiary FuelCell Energy Finance II, LLC (“FCEF II” or “Borrower”), entered into a Construction Loan Agreement (the “Agreement” or the “Generate Lending Construction Loan Agreement”) with Generate Lending, LLC (“Lender” or “Generate Lending”) pursuant to which Generate Lending agreed (the “Commitment”) to make available to FCEF II a credit facility in an aggregate principal amount of up to $100.0 million and, subject to further Lender approval and available capital, up to $300.0 million if requested by the Company (the “Facility”) to fund the manufacture, construction, installation, commissioning and start-up of stationary fuel cell projects to be developed by the Company on behalf of Borrower during the Availability Period (as defined below and in the Agreement). Fuel cell projects must meet certain conditions to be determined to be “Approved Projects” under the Facility. The Facility will be comprised of multiple loans to individual Approved Projects (each, a “Working Capital Loan”). Each Working Capital Loan will be sized to the lesser of (i) 100% of the construction budget and (ii) the invested amount that allows Lender to achieve a 10% unlevered, after-tax inefficient internal rate of return. Approved Projects will be funded at milestones on a cost incurred basis. FCEF II and the Company will contribute any additional equity required to construct an Approved Project on a pari-passu basis with the Working Capital Loans. The Commitment to provide Working Capital Loans will remain in place for thirty-six months from the date of the Agreement (the “Availability Period”). Interest will accrue at 9.5% per annum, calculated on a 30/360 basis, on all outstanding principal, paid on the first business day of each month. The initial draw amount under this facility, funded at closing, was $10 million. The maturity date for the outstanding principal amount of each Working Capital Loan will be the earlier of (a) the achievement of the Commercial Operation Date under the Engineering, Procurement and Construction (“EPC”) Agreement for such Approved Project, (b) ninety days prior to the required Commercial Operation Date under the Revenue Contract (as defined in the Agreement), or (c) upon certain defaults by Borrower. The lender has the right to issue a notice to the Borrower that the Commitment, and that all Working Capital Loans shall be due and payable on September 30, 2019; provided that such notice shall be issued by the Lender, if at all, during the ten (10) day period beginning on June 20, 2019 and ending on (and including) June 30, 2019. If the Lender delivers such notice, all of the Working Capital Loans, together with all accrued and unpaid interest thereon, shall be due and payable in its entirety, without penalty or premium. If the Lender delivers such notice, the Borrower may prepay all then outstanding Working Capital Loans at any time prior to September 30, 2019. Mandatory prepayments are required in the event of (i) material damage or destruction to an Approved Project, (ii) termination or default under an Approved Project’s Revenue Contract, (iii) a change of control, or (iv) failure to achieve Substantial Completion as defined under the EPC Agreement for such Approved Project by the required dates. Provided that the Approved Project has been completed as of the maturity date and no defaults exist with respect to the Working Capital Loans for such Approved Project, FCEF II, as determined in its sole discretion, will have a 90-day period to either sell the Approved Project or effect a refinancing, in either case proceeds of which will be used to repay the Working Capital Loan for the Approved Project. In the case of a disposition of the Approved Project, Lender will be entitled to a “Disposition Fee,” as described below. In the case where the Working Capital Loan for the Project is refinanced, Lender will have the right to make an equity investment in the Approved Project on terms such that Lender derives an after-tax yield of no less than a 12% internal rate of return on an investment of greater than 10% of the total purchase price. Borrower and Lender will enter into an arrangement to share any returns realized in excess of the foregoing target return. In the event that Borrower does not sell or refinance an Approved Project within ninety days following the Working Capital Loan maturity date (or such other date as may be mutually agreed), then the outstanding balance of the Working Capital Loan on such Approved Project shall convert into a 100% equity ownership of the applicable project company owning such Approved Project through execution of a Membership Interest Purchase Agreement (“MIPA”) with the Lender. At that time, the Lender will own the project and Borrower will not have any repayment obligations. Included in the applicable MIPA for each Approved Project subject to this provision will be a conditional purchase price adjustment for Borrower equal to 50% of any distributions to Lender after Lender has achieved a 10% inefficient after-tax, unlevered internal rate of return. In the event that Borrower and Lender are unable to come to terms on a MIPA for any Approved Project, the Working Capital Loan for such Approved Project will be required to be repaid in full without penalty or premium. Borrower will pay a draw down fee equal to 3% of the amount of each Working Capital Loan and certain other diligence and administration fees. Upon the sale of any Approved Project to a third party, Lender will be entitled to a disposition fee equal to 3% of the total sale price (“Disposition Fee”). At such time as Lender has made Working Capital Loans in the aggregate amount of greater than $100,000,000 but less than $200,000,000, the Disposition Fee is reduced to 2% and in the aggregate amount of greater than $200,000,000 but less than $300,000,000, the Disposition Fee is reduced to 1%. The initial draw amount under this Facility, funded at closing, was $10 million. The initial draw reflects loan advances for the first Approved Project under the Facility, the Bolthouse Farms 5 MW project in California. Additional drawdowns are expected to take place as the Company completes certain project milestones. The Company expects to use this Facility to fund the construction of its backlog, including the three LIPA projects totaling 39.8 MW and the two projects awarded pursuant to the Connecticut DEEP RFP, totaling 22.2 MW. Amendment to Hercules Loan and Security Agreement As noted in Note 12, the Company has a loan and security agreement with Hercules for an aggregate principal amount of up to $25.0 million, subject to certain terms and conditions. On December 19, 2018, to facilitate the Generate Lending Construction Loan Agreement described above, the Company and Hercules (and various affiliated entities) entered into the fifth amendment to the loan and security agreement to (i) modify the definitions of “Permitted Investment”, “Permitted Liens”, “Project Companies”, “Project Company Indebtedness”, and “Qualified Subsidiary” to permit the creation of a new holding company, FuelCell Energy Finance II, LLC to hold the membership interests of project companies to be funded under the Facility described above and (ii) modify the definition of “Project Roundtrip Transaction” to increase the investment amount under a Project Roundtrip Transaction to $40.0 million. Series C Preferred Shares As noted in Note 14, as of October 31, 2018 and 2017, there were 8,992 shares and 33,300 shares of Series C Preferred Stock issued and outstanding, respectively, with a carrying value of $7.5 million and $27.7 million, respectively. As of October 31, 2018, the Series C Preferred Shares were convertible into shares of common stock subject to the beneficial ownership limitations provided in the Series C Certificate of Designations, at a conversion price equal to $1.50 per share. The conversion price is subject to adjustment as provided in the Series C Certificate of Designations, including adjustments if the Company sells shares of common stock or equity securities convertible into or exercisable for shares of common stock, at variable prices below the conversion price then in effect. Subsequent to October 31, 2018, the conversion price has been periodically adjusted in accordance with the terms of the Series C Certificate of Designations and was $0.434 as of January 2, 2019.

Subsequent Events

12 Months Ended

Oct. 31, 2018

Note 22. Subsequent Events

NRG Loan Facility

As described in Note 12, the Company has a project finance facility with NRG pursuant to which NRG extended a $40 million revolving construction and term financing facility (the “Loan Facility”) to FuelCell Finance for the purpose of accelerating project development by the Company and its subsidiaries. On December 13, 2018, FuelCell Finance’s wholly owned subsidiary, Central CA Fuel Cell 2, LLC, drew a construction loan advance of $5.8 million under the Loan Facility. This advance will be used to support the completion of construction of the 2.8 MW Tulare BioMAT project in California. This plant is expected to meet its commercial operations date (COD) in March 2019. In conjunction with the December 13, 2018 draw, FuelCell Finance and NRG entered into an amendment to the NRG Agreement (the “Amendment”) to revise the definitions of the terms “Maturity Date” and “Project Draw Period” under the NRG Agreement and to make other related revisions. Prior to the Amendment, FuelCell Finance and its subsidiaries were able to request draws under the Loan Facility through July 30, 2019 and the Maturity Date of each note under the Loan Facility was five years after the first disbursement under such note. Pursuant to the Amendment, FuelCell Finance and its subsidiaries may now request draws only through December 31, 2018 and the Maturity Date of each note is the earlier of (a) March 31, 2019 and (b) the COD (commercial operation date or substantial completion date, as applicable) with respect to the fuel cell project owned by the borrower under such note. There are currently no other drawdowns or outstanding balances under the Loan Facility.

Generate Lending Loan Facility

On December 21, 2018, the Company, through its indirect wholly-owned subsidiary FuelCell Energy Finance II, LLC (“FCEF II” or “Borrower”), entered into a Construction Loan Agreement (the “Agreement” or the “Generate Lending Construction Loan Agreement”) with Generate Lending, LLC (“Lender” or “Generate Lending”) pursuant to which Generate Lending agreed (the “Commitment”) to make available to FCEF II a credit facility in an aggregate principal amount of up to $100.0 million and, subject to further Lender approval and available capital, up to $300.0 million if requested by the Company (the “Facility”) to fund the manufacture, construction, installation, commissioning and start-up of stationary fuel cell projects to be developed by the Company on behalf of Borrower during the Availability Period (as defined below and in the Agreement). Fuel cell projects must meet certain conditions to be determined to be “Approved Projects” under the Facility. The Facility will be comprised of multiple loans to individual Approved Projects (each, a “Working Capital Loan”). Each Working Capital Loan will be sized to the lesser of (i) 100% of the construction budget and (ii) the invested amount that allows Lender to achieve a 10% unlevered, after-tax inefficient internal rate of return. Approved Projects will be funded at milestones on a cost incurred basis. FCEF II and the Company will contribute any additional equity required to construct an Approved Project on a pari-passu basis with the Working Capital Loans. The Commitment to provide Working Capital Loans will remain in place for thirty-six months from the date of the Agreement (the “Availability Period”). Interest will accrue at 9.5% per annum, calculated on a 30/360 basis, on all outstanding principal, paid on the first business day of each month. The initial draw amount under this facility, funded at closing, was $10 million.

The maturity date for the outstanding principal amount of each Working Capital Loan will be the earlier of (a) the achievement of the Commercial Operation Date under the Engineering, Procurement and Construction (“EPC”) Agreement for such Approved Project, (b) ninety days prior to the required Commercial Operation Date under the Revenue Contract (as defined in the Agreement), or (c) upon certain defaults by Borrower. The lender has the right to issue a notice to the Borrower that the Commitment, and that all Working Capital Loans shall be due and payable on September 30, 2019; provided that such notice shall be issued by the Lender, if at all, during the ten (10) day period beginning on June 20, 2019 and ending on (and including) June 30, 2019. If the Lender delivers such notice, all of the Working Capital Loans, together with all accrued and unpaid interest thereon, shall be due and payable in its entirety, without penalty or premium. If the Lender delivers such notice, the Borrower may prepay all then outstanding Working Capital Loans at any time prior to September 30, 2019. Mandatory prepayments are required in the event of (i) material damage or destruction to an Approved Project, (ii) termination or default under an Approved Project’s Revenue Contract, (iii) a change of control, or (iv) failure to achieve Substantial Completion as defined under the EPC Agreement for such Approved Project by the required dates.

Provided that the Approved Project has been completed as of the maturity date and no defaults exist with respect to the Working Capital Loans for such Approved Project, FCEF II, as determined in its sole discretion, will have a 90-day period to either sell the Approved Project or effect a refinancing, in either case proceeds of which will be used to repay the Working Capital Loan for the Approved Project. In the case of a disposition of the Approved Project, Lender will be entitled to a “Disposition Fee,” as described below. In the case where the Working Capital Loan for the Project is refinanced, Lender will have the right to make an equity investment in the Approved Project on terms such that Lender derives an after-tax yield of no less than a 12% internal rate of return on an investment of greater than 10% of the total purchase price. Borrower and Lender will enter into an arrangement to share any returns realized in excess of the foregoing target return. In the event that Borrower does not sell or refinance an Approved Project within ninety days following the Working Capital Loan maturity date (or such other date as may be mutually agreed), then the outstanding balance of the Working Capital Loan on such Approved Project shall convert into a 100% equity ownership of the applicable project company owning such Approved Project through execution of a Membership Interest Purchase Agreement (“MIPA”) with the Lender. At that time, the Lender will own the project and Borrower will not have any repayment obligations. Included in the applicable MIPA for each Approved Project subject to this provision will be a conditional purchase price adjustment for Borrower equal to 50% of any distributions to Lender after Lender has achieved a 10% inefficient after-tax, unlevered internal rate of return. In the event that Borrower and Lender are unable to come to terms on a MIPA for any Approved Project, the Working Capital Loan for such Approved Project will be required to be repaid in full without penalty or premium.

Borrower will pay a draw down fee equal to 3% of the amount of each Working Capital Loan and certain other diligence and administration fees. Upon the sale of any Approved Project to a third party, Lender will be entitled to a disposition fee equal to 3% of the total sale price (“Disposition Fee”). At such time as Lender has made Working Capital Loans in the aggregate amount of greater than $100,000,000 but less than $200,000,000, the Disposition Fee is reduced to 2% and in the aggregate amount of greater than $200,000,000 but less than $300,000,000, the Disposition Fee is reduced to 1%.

The initial draw amount under this Facility, funded at closing, was $10 million. The initial draw reflects loan advances for the first Approved Project under the Facility, the Bolthouse Farms 5 MW project in California. Additional drawdowns are expected to take place as the Company completes certain project milestones. The Company expects to use this Facility to fund the construction of its backlog, including the three LIPA projects totaling 39.8 MW and the two projects awarded pursuant to the Connecticut DEEP RFP, totaling 22.2 MW.

Amendment to Hercules Loan and Security Agreement

As noted in Note 12, the Company has a loan and security agreement with Hercules for an aggregate principal amount of up to $25.0 million, subject to certain terms and conditions.

On December 19, 2018, to facilitate the Generate Lending Construction Loan Agreement described above, the Company and Hercules (and various affiliated entities) entered into the fifth amendment to the loan and security agreement to (i) modify the definitions of “Permitted Investment”, “Permitted Liens”, “Project Companies”, “Project Company Indebtedness”, and “Qualified Subsidiary” to permit the creation of a new holding company, FuelCell Energy Finance II, LLC to hold the membership interests of project companies to be funded under the Facility described above and (ii) modify the definition of “Project Roundtrip Transaction” to increase the investment amount under a Project Roundtrip Transaction to $40.0 million.

Series C Preferred Shares

As noted in Note 14, as of October 31, 2018 and 2017, there were 8,992 shares and 33,300 shares of Series C Preferred Stock issued and outstanding, respectively, with a carrying value of $7.5 million and $27.7 million, respectively. As of October 31, 2018, the Series C Preferred Shares were convertible into shares of common stock subject to the beneficial ownership limitations provided in the Series C Certificate of Designations, at a conversion price equal to $1.50 per share. The conversion price is subject to adjustment as provided in the Series C Certificate of Designations, including adjustments if the Company sells shares of common stock or equity securities convertible into or exercisable for shares of common stock, at variable prices below the conversion price then in effect. Subsequent to October 31, 2018, the conversion price has been periodically adjusted in accordance with the terms of the Series C Certificate of Designations and was $0.434 as of January 2, 2019.