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<p>potential worldwide savings in health care costs have been estimated at trillions of dollars annually.</p>

<p><big> Intermittency </big></p>
<p>The two most important forms of renewable energy, solar and wind, are intermittent energy sources: they are not available constantly, resulting in lower <a href="page.php?w=capacity_factor">capacity factor</a>s. In contrast, <a href="page.php?w=Fossil_fuel_power_station">fossil fuel power plants</a>, nuclear power plants and hydropower are usually able to produce precisely the amount of energy an <a href="page.php?w=Electrical_grid">electricity grid</a></p><p>
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