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<p>(<a href="page.php?w=methane">methane</a>, <a href="page.php?w=hydrogen_storage">hydrogen storage</a>, <a href="page.php?w=oxyhydrogen">oxyhydrogen</a>)<br/>
** <a href="page.php?w=Power-to-solid">Power-to-solid</a> (<a href="page.php?w=metal_energy_carriers">metal energy carriers</a>, <a href="page.php?w=sulfur">sulfur</a>)</p>

<p><big> Mechanical </big></p>
<p>Energy can be stored in <a href="page.php?w=water">water</a> pumped to a higher elevation using <a href="page.php?w=pumped_storage">pumped storage</a> methods or by moving solid matter to higher</p><p>
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