| Special Regime for Electricity Generated from Renewable and CHP Sources             | 
                                                                                                        
             | 
                                                                                                        
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                                                                                                        Spain             | 
                                                                                                        2020             | 
                  
              
                                                                                                        | Royal Decree 244/2019 Regulating the Administrative, Technical and Economic Conditions of the Self-Consumption of Electric Energy             | 
                                                                                                        
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                                                                                                        Spain             | 
                                                                                                        2019             | 
                  
              
                                                                                                        | Low Emissions Zone Barcelona             | 
                                                                                                        
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             | 
                                                                                                        Spain             | 
                                                                                                        2019             | 
                  
              
                                                                                                        | Law 9/2017 on Public Sector Contracts             | 
                                                                                                        
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                                                                                                        Spain             | 
                                                                                                        2018             | 
                  
              
                                                                                                        | State Housing Plan 2018-2021             | 
                                                                                                        
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                                                                                                        Spain             | 
                                                                                                        2018             | 
                  
              
                                                                                                        | Royal Decree No. 6/2018 Creating the Interministerial Commission for the Incorporation of Ecological Criteria in Public Procurement             | 
                                                                                                        
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                                                                                                        Spain             | 
                                                                                                        2018             | 
                  
              
                                                                                                        | Plan PIMA FRÍO             | 
                                                                                                        
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                                                                                                        Spain             | 
                                                                                                        2018             | 
                  
              
                                                                                                        | Royal Decree 15/2018 on Urgent Measures for the Energy Transition and the Protection of Consumers             | 
                                                                                                        
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                                                                                                        Spain             | 
                                                                                                        2018             | 
                  
              
                                                                                                        | PAREER II Programme             | 
                                                                                                        
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                                                                                                        Spain             | 
                                                                                                        2018             | 
                  
              
                                                                                                        | Royal Decree 564/2017 on the Certification of Energy Efficiency in Buildings (Amending Royal Decree 235/2013)             | 
                                                                                                        
             | 
                                                                                                        
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                                                                                                        Spain             | 
                                                                                                        2017             | 
                  
              
                                                                                                        | Renewable Energy Auctions             | 
                                                                                                        
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                                                                                                        Spain             | 
                                                                                                        2017             | 
                  
              
                                                                                                        | Registration Tax Based on CO2 Emissions             | 
                                                                                                        
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             | 
                                                                                                        Spain             | 
                                                                                                        2017             | 
                  
              
                                                                                                        | ICO-IDAE Energy Efficiency Financing Line 2017-2018: Aids for Energy Efficiency Industry and Trade Sectors             | 
                                                                                                        
             | 
                                                                                                        
             | 
                                                                                                        Spain             | 
                                                                                                        2017             | 
                  
              
                                                                                                        | FEDER-POCS 2014-2020 Aid Program for the Energy Renovation of General State Administration Buildings and Infrastructures             | 
                                                                                                        
             | 
                                                                                                        
             | 
                                                                                                        Spain             | 
                                                                                                        2017             | 
                  
              
                                                                                                        | FEDER -POCS 2014-2020 Singular Projects for Local Entities to Promote the Transition to a Low-carbon Economy             | 
                                                                                                        
             | 
                                                                                                        
             | 
                                                                                                        Spain             | 
                                                                                                        2017             | 
                  
              
                                                                                                        | Resolution of the State Secretary of Energy             | 
                                                                                                        
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                                                                                                        Spain             | 
                                                                                                        2017             | 
                  
              
                                                                                                        | Royal Decree 359/2017 Setting a Call for the Allocation of the Specific Compensation Regime for New Plants of Electricity Production from RES, Located in the Mainland Electricity System             | 
                                                                                                        
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             | 
                                                                                                        Spain             | 
                                                                                                        2017             | 
                  
              
                                                                                                        | Local incentives - Parking charges             | 
                                                                                                        
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             | 
                                                                                                        Spain             | 
                                                                                                        2017             | 
                  
              
                                                                                                        | Royal Decree 650/2017 Setting a Quota of 3000 MW of Installed Capacity for New Plants of Electricity Production from RES Located in the Mainland Electricity System, Which Can Receive the Specific Compensation Regime             | 
                                                                                                        
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             | 
                                                                                                        Spain             | 
                                                                                                        2017             | 
                  
              
                                                                                                        | National Energy Efficiency Action Plan 2017-2020             | 
                                                                                                        
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             | 
                                                                                                        Spain             | 
                                                                                                        2017             |