<?xml version="1.0" encoding="utf-8"?>
<!--Orange Button Taxonomy - PerformanceGuarantee-->
<xs:schema
  attributeFormDefault="unqualified"
  elementFormDefault="qualified"
  targetNamespace="http://xbrl.us/Solar/v1.1/2018-02-09/solar-PerformanceGuarantee"
  xmlns:link="http://www.xbrl.org/2003/linkbase"
  xmlns:nonnum="http://www.xbrl.org/dtr/type/non-numeric"
  xmlns:solar="http://xbrl.us/Solar/v1.1/2018-02-09/solar"
  xmlns:solar-PerformanceGuarantee="http://xbrl.us/Solar/v1.1/2018-02-09/solar-PerformanceGuarantee"
  xmlns:xbrldt="http://xbrl.org/2005/xbrldt"
  xmlns:xbrli="http://www.xbrl.org/2003/instance"
  xmlns:xlink="http://www.w3.org/1999/xlink"
  xmlns:xs="http://www.w3.org/2001/XMLSchema">
    <xs:annotation>
        <xs:documentation>This schema contains the entry point for the PerformanceGuarantee</xs:documentation>
        <xs:appinfo>
            <link:roleType
              id="roleType_PerformanceGuarantee"
              roleURI="http://xbrl.us/Solar/v1.1/2018-02-09/roles/PerformanceGuarantee">
                <link:definition>100960 - Documents - Performance Guarantee</link:definition>
                <link:usedOn>link:presentationLink</link:usedOn>
            </link:roleType>
            <link:linkbaseRef
              xlink:arcrole="http://www.w3.org/1999/xlink/properties/linkbase"
              xlink:href="solar-PerformanceGuarantee_2018-02-09_r01_pre.xml"
              xlink:role="http://www.xbrl.org/2003/role/presentationLinkbaseRef"
              xlink:type="simple"/>
            <link:linkbaseRef
              xlink:arcrole="http://www.w3.org/1999/xlink/properties/linkbase"
              xlink:href="solar-PerformanceGuarantee_2018-02-09_r01_def.xml"
              xlink:role="http://www.xbrl.org/2003/role/definitionLinkbaseRef"
              xlink:type="simple"/>
        </xs:appinfo>
    </xs:annotation>
    <xs:import
      namespace="http://www.xbrl.org/2003/instance"
      schemaLocation="http://www.xbrl.org/2003/xbrl-instance-2003-12-31.xsd"/>
    <xs:import
      namespace="http://xbrl.us/Solar/v1.1/2018-02-09/solar"
      schemaLocation="../../core/solar_2018-02-09_r01.xsd"/>
</xs:schema>