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Equipment Related to Power Purchase Agreements and Fuel Delivered to Customers, net - Future minimum lease payments (Details) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2020 | Dec. 31, 2019
Lessor, Lease, Description [Line Items] |  |
Depreciation expense | $ 7.9 | $ 6.3
Minimum |  |
Lessor, Lease, Description [Line Items] |  |
Lease term | 1 year |
Maximum |  |
Lessor, Lease, Description [Line Items] |  |
Lease term | 10 years |

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- Definition The amount of expense recognized in the current period that reflects the allocation of the cost of lessor assets under operating lease over the assets' useful lives. + References No definition available. + Details
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Namespace Prefix: | plug_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
Name: | us-gaap_LessorLeaseDescriptionLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition Term of lessor's operating lease, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 842 -SubTopic 30 -Section 50 -Paragraph 3 -Subparagraph (a)(3) -URI http://asc.fasb.org/extlink&oid=121576215&loc=SL77919359-209981 + Details
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Namespace Prefix: | us-gaap_
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Balance Type: | na
Period Type: | instant

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- Details
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Balance Type: |
Period Type: |

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- Details
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Namespace Prefix: |
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Balance Type: |
Period Type: |