Table 20.
Characteristics of some energy sources.
| Energy Source | Predictable | Unpredictable | Controllable | Non-Controllable |
|---|---|---|---|---|
| Solar | ✓ | ✓ | ||
| RF | ✓ | ✓ | ||
| Thermal | ✓ | ✓ | ||
| Pyroelectric | ✓ | ✓ |
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