<?xml version="1.0" encoding="US-ASCII"?>
<!-- DFIN New ActiveDisclosure (SM) XBRL Linkbase Document - http://www.dfinsolutions.com/ -->
<!-- Creation Date :2023-06-12T10:09:04.4213+00:00 -->
<!-- Copyright (c) 2023 Donnelly Financial Solutions, Inc. All Rights Reserved. -->
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  <link:roleRef roleURI="http://www.orionlighting.com/20230331/taxonomy/role/Role_DisclosureLEASESTables" xlink:href="oesx-20230331.xsd#Role_DisclosureLEASESTables" xlink:type="simple"/>
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