Table 2.
Renewable energy resources
| Energy resource | Main basis | Global production in 2018 (ktoe)a |
|---|---|---|
| Solar radiation (beam and scattered) | Solar energy (direct) | 90,048 (includes other solar derived resources, except where listed separately) |
| Hydraulic | Solar energy (indirect) | 362,332 |
| Wind | Solar energy (indirect) | 196,329 |
| Wave | Solar energy (indirect) | Very small, but included under solar radiation where measured |
| Ocean current | Solar energy (indirect) | Very small, but included under solar radiation where measured |
| Ocean thermal | Solar energy (indirect) | Very small, but included under solar radiation where measured |
| Biomass (utilized slower than it is regenerated) | Solar energy (indirect) | 1,324,214 (biofuels and waste) |
| Geothermal (ground source) | Solar energy (indirect) | Included in geothermal (high temperature) |
| Geothermal (high temperature) | Heat generated deep within the earth | 2062 |
| Tidal | Gravitational forces between earth and moon | Very small |