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Sources of usable energy intended to replace fuel sources without the undesired consequences of the replaced fuels.
This category has the following 11 subcategories, out of 11 total.
- ► Compressed air power (10 P)
- ► Renewable energy (20 C, 96 P)
- ► Water fuel (1 C, 6 P)
Pages in category "Alternative energy"
The following 55 pages are in this category, out of 55 total. This list may not reflect recent changes (learn more).