<?xml version="1.0" encoding="UTF-8"?>

<!--XBRL Document Created with Wdesk from Workiva-->
<!--Copyright 2020 Workiva-->
<!--r:a4dc3781-5442-4047-9e7b-db65658ccf1c,g:26c44b11-4c23-41a2-82b3-6bb0907d2dbc-->
<link:linkbase xmlns:link="http://www.xbrl.org/2003/linkbase" xmlns:xlink="http://www.w3.org/1999/xlink" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://www.xbrl.org/2003/linkbase http://www.xbrl.org/2003/xbrl-linkbase-2003-12-31.xsd">
  <link:roleRef roleURI="http://www.portlandgeneral.com/role/Cover" xlink:type="simple" xlink:href="por-20200824.xsd#Cover"/>
  <link:presentationLink xlink:role="http://www.portlandgeneral.com/role/Cover" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_dei_CoverAbstract_3db9788e-34d0-45ec-95ab-8e3a70912e82" xlink:href="https://xbrl.sec.gov/dei/2019/dei-2019-01-31.xsd#dei_CoverAbstract"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_DocumentType_4afb7b27-1308-45d3-a4a5-ab575387d80b" xlink:href="https://xbrl.sec.gov/dei/2019/dei-2019-01-31.xsd#dei_DocumentType"/>
    <link:presentationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_dei_CoverAbstract_3db9788e-34d0-45ec-95ab-8e3a70912e82" xlink:to="loc_dei_DocumentType_4afb7b27-1308-45d3-a4a5-ab575387d80b" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_DocumentPeriodEndDate_327c6b41-83d9-455c-baeb-5797f0f6c575" xlink:href="https://xbrl.sec.gov/dei/2019/dei-2019-01-31.xsd#dei_DocumentPeriodEndDate"/>
    <link:presentationArc order="2" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_dei_CoverAbstract_3db9788e-34d0-45ec-95ab-8e3a70912e82" xlink:to="loc_dei_DocumentPeriodEndDate_327c6b41-83d9-455c-baeb-5797f0f6c575" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityRegistrantName_1d1991b3-742c-44be-a098-381add7049fd" xlink:href="https://xbrl.sec.gov/dei/2019/dei-2019-01-31.xsd#dei_EntityRegistrantName"/>
    <link:presentationArc order="3" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_dei_CoverAbstract_3db9788e-34d0-45ec-95ab-8e3a70912e82" xlink:to="loc_dei_EntityRegistrantName_1d1991b3-742c-44be-a098-381add7049fd" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityIncorporationStateCountryCode_d5aceeb4-4061-416e-9255-ff7a5228748f" xlink:href="https://xbrl.sec.gov/dei/2019/dei-2019-01-31.xsd#dei_EntityIncorporationStateCountryCode"/>
    <link:presentationArc order="4" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_dei_CoverAbstract_3db9788e-34d0-45ec-95ab-8e3a70912e82" xlink:to="loc_dei_EntityIncorporationStateCountryCode_d5aceeb4-4061-416e-9255-ff7a5228748f" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityFileNumber_dd22e180-80d9-41a9-8ad8-81bc5fa3f07b" xlink:href="https://xbrl.sec.gov/dei/2019/dei-2019-01-31.xsd#dei_EntityFileNumber"/>
    <link:presentationArc order="5" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_dei_CoverAbstract_3db9788e-34d0-45ec-95ab-8e3a70912e82" xlink:to="loc_dei_EntityFileNumber_dd22e180-80d9-41a9-8ad8-81bc5fa3f07b" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityTaxIdentificationNumber_44bdcf20-70d7-4676-b691-502798ff2974" xlink:href="https://xbrl.sec.gov/dei/2019/dei-2019-01-31.xsd#dei_EntityTaxIdentificationNumber"/>
    <link:presentationArc order="6" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_dei_CoverAbstract_3db9788e-34d0-45ec-95ab-8e3a70912e82" xlink:to="loc_dei_EntityTaxIdentificationNumber_44bdcf20-70d7-4676-b691-502798ff2974" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityAddressAddressLine1_a5949aa6-7341-498b-ac64-d71db42d8998" xlink:href="https://xbrl.sec.gov/dei/2019/dei-2019-01-31.xsd#dei_EntityAddressAddressLine1"/>
    <link:presentationArc order="7" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_dei_CoverAbstract_3db9788e-34d0-45ec-95ab-8e3a70912e82" xlink:to="loc_dei_EntityAddressAddressLine1_a5949aa6-7341-498b-ac64-d71db42d8998" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityAddressCityOrTown_7fa1c9f4-957e-4601-99c6-fa8792c7301e" xlink:href="https://xbrl.sec.gov/dei/2019/dei-2019-01-31.xsd#dei_EntityAddressCityOrTown"/>
    <link:presentationArc order="8" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_dei_CoverAbstract_3db9788e-34d0-45ec-95ab-8e3a70912e82" xlink:to="loc_dei_EntityAddressCityOrTown_7fa1c9f4-957e-4601-99c6-fa8792c7301e" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityAddressStateOrProvince_a9b1d192-fd64-422c-8f5c-6384da79805f" xlink:href="https://xbrl.sec.gov/dei/2019/dei-2019-01-31.xsd#dei_EntityAddressStateOrProvince"/>
    <link:presentationArc order="9" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_dei_CoverAbstract_3db9788e-34d0-45ec-95ab-8e3a70912e82" xlink:to="loc_dei_EntityAddressStateOrProvince_a9b1d192-fd64-422c-8f5c-6384da79805f" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityAddressPostalZipCode_0300184a-179d-49d3-b0c4-406cfbfe1c36" xlink:href="https://xbrl.sec.gov/dei/2019/dei-2019-01-31.xsd#dei_EntityAddressPostalZipCode"/>
    <link:presentationArc order="10" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_dei_CoverAbstract_3db9788e-34d0-45ec-95ab-8e3a70912e82" xlink:to="loc_dei_EntityAddressPostalZipCode_0300184a-179d-49d3-b0c4-406cfbfe1c36" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_CityAreaCode_76dc6312-369f-45c4-a53c-940145ff9093" xlink:href="https://xbrl.sec.gov/dei/2019/dei-2019-01-31.xsd#dei_CityAreaCode"/>
    <link:presentationArc order="11" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_dei_CoverAbstract_3db9788e-34d0-45ec-95ab-8e3a70912e82" xlink:to="loc_dei_CityAreaCode_76dc6312-369f-45c4-a53c-940145ff9093" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_LocalPhoneNumber_5477aaf5-5bfb-4db2-bad9-7b57dee9b1e9" xlink:href="https://xbrl.sec.gov/dei/2019/dei-2019-01-31.xsd#dei_LocalPhoneNumber"/>
    <link:presentationArc order="12" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_dei_CoverAbstract_3db9788e-34d0-45ec-95ab-8e3a70912e82" xlink:to="loc_dei_LocalPhoneNumber_5477aaf5-5bfb-4db2-bad9-7b57dee9b1e9" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_WrittenCommunications_74b221df-f958-4115-a816-e1e3d0ee3882" xlink:href="https://xbrl.sec.gov/dei/2019/dei-2019-01-31.xsd#dei_WrittenCommunications"/>
    <link:presentationArc order="13" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_dei_CoverAbstract_3db9788e-34d0-45ec-95ab-8e3a70912e82" xlink:to="loc_dei_WrittenCommunications_74b221df-f958-4115-a816-e1e3d0ee3882" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_SolicitingMaterial_6eb430f4-cba1-437e-a102-55f78ec980c9" xlink:href="https://xbrl.sec.gov/dei/2019/dei-2019-01-31.xsd#dei_SolicitingMaterial"/>
    <link:presentationArc order="14" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_dei_CoverAbstract_3db9788e-34d0-45ec-95ab-8e3a70912e82" xlink:to="loc_dei_SolicitingMaterial_6eb430f4-cba1-437e-a102-55f78ec980c9" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_PreCommencementTenderOffer_ed8b177f-9656-4049-a11e-81c0b754cc34" xlink:href="https://xbrl.sec.gov/dei/2019/dei-2019-01-31.xsd#dei_PreCommencementTenderOffer"/>
    <link:presentationArc order="15" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_dei_CoverAbstract_3db9788e-34d0-45ec-95ab-8e3a70912e82" xlink:to="loc_dei_PreCommencementTenderOffer_ed8b177f-9656-4049-a11e-81c0b754cc34" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_PreCommencementIssuerTenderOffer_427b4cfe-0863-4979-98af-0d6c9e5ecf1c" xlink:href="https://xbrl.sec.gov/dei/2019/dei-2019-01-31.xsd#dei_PreCommencementIssuerTenderOffer"/>
    <link:presentationArc order="16" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_dei_CoverAbstract_3db9788e-34d0-45ec-95ab-8e3a70912e82" xlink:to="loc_dei_PreCommencementIssuerTenderOffer_427b4cfe-0863-4979-98af-0d6c9e5ecf1c" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityEmergingGrowthCompany_2eba6cc4-d688-4223-85de-3399446cf6cf" xlink:href="https://xbrl.sec.gov/dei/2019/dei-2019-01-31.xsd#dei_EntityEmergingGrowthCompany"/>
    <link:presentationArc order="17" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_dei_CoverAbstract_3db9788e-34d0-45ec-95ab-8e3a70912e82" xlink:to="loc_dei_EntityEmergingGrowthCompany_2eba6cc4-d688-4223-85de-3399446cf6cf" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_AmendmentFlag_6a845f7b-0b5f-4dd4-b36d-42d2b501f426" xlink:href="https://xbrl.sec.gov/dei/2019/dei-2019-01-31.xsd#dei_AmendmentFlag"/>
    <link:presentationArc order="18" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_dei_CoverAbstract_3db9788e-34d0-45ec-95ab-8e3a70912e82" xlink:to="loc_dei_AmendmentFlag_6a845f7b-0b5f-4dd4-b36d-42d2b501f426" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityCentralIndexKey_9c382880-9a9f-4a49-b48d-b94ba4e15efe" xlink:href="https://xbrl.sec.gov/dei/2019/dei-2019-01-31.xsd#dei_EntityCentralIndexKey"/>
    <link:presentationArc order="19" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_dei_CoverAbstract_3db9788e-34d0-45ec-95ab-8e3a70912e82" xlink:to="loc_dei_EntityCentralIndexKey_9c382880-9a9f-4a49-b48d-b94ba4e15efe" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StatementTable_65361397-5f59-40ce-9242-378865cbbab8" xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_StatementTable"/>
    <link:presentationArc order="20" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_dei_CoverAbstract_3db9788e-34d0-45ec-95ab-8e3a70912e82" xlink:to="loc_us-gaap_StatementTable_65361397-5f59-40ce-9242-378865cbbab8" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StatementClassOfStockAxis_69fcce88-54d5-4433-9baa-ca61b54b0d29" xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_StatementClassOfStockAxis"/>
    <link:presentationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_StatementTable_65361397-5f59-40ce-9242-378865cbbab8" xlink:to="loc_us-gaap_StatementClassOfStockAxis_69fcce88-54d5-4433-9baa-ca61b54b0d29" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ClassOfStockDomain_46ea6c62-a29e-40d4-8fa0-76a3eafc7854" xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_ClassOfStockDomain"/>
    <link:presentationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_StatementClassOfStockAxis_69fcce88-54d5-4433-9baa-ca61b54b0d29" xlink:to="loc_us-gaap_ClassOfStockDomain_46ea6c62-a29e-40d4-8fa0-76a3eafc7854" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CommonStockMember_b4e6ed58-c1f0-4e89-ac81-8295fb4f8112" xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_CommonStockMember"/>
    <link:presentationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_ClassOfStockDomain_46ea6c62-a29e-40d4-8fa0-76a3eafc7854" xlink:to="loc_us-gaap_CommonStockMember_b4e6ed58-c1f0-4e89-ac81-8295fb4f8112" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_MediumTermNotesMember_f83eb1bc-e6d6-4ee2-be16-c5c4bc232de3" xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_MediumTermNotesMember"/>
    <link:presentationArc order="2" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_ClassOfStockDomain_46ea6c62-a29e-40d4-8fa0-76a3eafc7854" xlink:to="loc_us-gaap_MediumTermNotesMember_f83eb1bc-e6d6-4ee2-be16-c5c4bc232de3" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StatementLineItems_a80007b6-7b5e-4152-91f0-a5b1eaf81838" xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_StatementLineItems"/>
    <link:presentationArc order="2" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_StatementTable_65361397-5f59-40ce-9242-378865cbbab8" xlink:to="loc_us-gaap_StatementLineItems_a80007b6-7b5e-4152-91f0-a5b1eaf81838" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_Security12bTitle_d710b1c9-9826-4c12-a6dc-8680c0fb0a71" xlink:href="https://xbrl.sec.gov/dei/2019/dei-2019-01-31.xsd#dei_Security12bTitle"/>
    <link:presentationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_StatementLineItems_a80007b6-7b5e-4152-91f0-a5b1eaf81838" xlink:to="loc_dei_Security12bTitle_d710b1c9-9826-4c12-a6dc-8680c0fb0a71" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_TradingSymbol_d396acb7-19e0-4b69-9c7a-210aa9b293b4" xlink:href="https://xbrl.sec.gov/dei/2019/dei-2019-01-31.xsd#dei_TradingSymbol"/>
    <link:presentationArc order="2" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_StatementLineItems_a80007b6-7b5e-4152-91f0-a5b1eaf81838" xlink:to="loc_dei_TradingSymbol_d396acb7-19e0-4b69-9c7a-210aa9b293b4" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_SecurityExchangeName_ef9ac72f-12dd-4cc7-ba6c-7a04fa519529" xlink:href="https://xbrl.sec.gov/dei/2019/dei-2019-01-31.xsd#dei_SecurityExchangeName"/>
    <link:presentationArc order="3" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_StatementLineItems_a80007b6-7b5e-4152-91f0-a5b1eaf81838" xlink:to="loc_dei_SecurityExchangeName_ef9ac72f-12dd-4cc7-ba6c-7a04fa519529" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
  </link:presentationLink>
</link:linkbase>
