| refer to the energy | 0.25 |
| become cheaper | 0.16 |
| become popular | 0.16 |
| renewable | 0.38 |
| competitive | 0.32 |
| free | 0.25 |
| friendly | 0.16 |
| used to generate electr… | 0.81 |
| produced | 0.69 |
| harnessed | 0.44 |
| converted throughout th… | 0.41 |
| harnessed by windmill | 0.41 |
| used to pump water | 0.25 |