<http://schema.org/caption>
"Existing infrastructure could be used to store surplus renewable electricity as synthetic natural gas (Image: &lt;a href=\"http://commons.wikimedia.org/wiki/File:National_Grid_LNG_Tank.jpg\" target=\"_blank\"&gt;Fletcher6&lt;/a&gt; via Wikipedia Commons)"^^<http://www.w3.org/2001/XMLSchema#string>
<http://newatlas.com/storing-surplus-green-energy-as-natural-gas/15007/>