| Value | Category | 
                                    
                    
                        | -96 | Other, specify | 
                                    
                    
                        | 1 | Electricity | 
                                    
                    
                        | 2 | Solar | 
                                    
                    
                        | 3 | Gas | 
                                    
                    
                        | 4 | Gas (biogas) | 
                                    
                    
                        | 5 | Lamp oil | 
                                    
                    
                        | 6 | Candle | 
                                    
                    
                        | 7 | Firewood | 
                                    
                    
                        | 8 | Private generator | 
                                    
                    
                        | 9 | Battery | 
                            
            Warning: these figures indicate the number of cases found in the data file. They cannot be interpreted as summary statistics of the population of interest.