Portugal
0.23 - 0.28$
price on 07.05.2023
| Country: | Portugal |
| Type: | Postage stamps |
| Series: | Energy - Cycle of Natural Resources |
| Nominal: | 4 $ |
| Year: | 1976 |
| Material: | Esmalte Fosforecente |
| Perforation: | comb 14¼ x 14 |
| Mintage: | 5,000,000 |
Energy - Cycle of Natural Resources
 Hydroelectric Energy 0.08$ |  Fossil Fuels 0.23$ |  Geothermal Energy 0.35$ |  Wind power 0.68$ |
 Solar Energy 1$ |