DOE OE Energy Storage Systems Safety Roadmap Focus On Codes And .

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DOE OE Energy Storage Systems Safety RoadmapFocus on Codes and Standards – June 2018The goal of the DOE OE ESS Safety Roadmap1 is to foster confidence inthe safety and reliability of energy storage systems.What’s Time Sensitive orNew?There are three interrelated objectives to support the realization of thatgoal: research, codes and standards and communication/coordination. Theobjective focused on codes and standards is .The first draft report for NFPA 855 isavailable at www.nfpa.org/855next.Click on “Submit Public CommentOnline” by July 12, 2018 to submit acomment.To apply research and development to support efforts that arefocused on ensuring that codes and standards are available toenable the safe implementation of energy storage systems in acomprehensive, non-discriminatory and science-based manner.The following activities support that objective and realization of the goal:a. Review and assess codes and standards which affect the design,installation, and operation of energy storage systems.b. Identify gaps in knowledge that require research and analysis thatcan serve as a basis for criteria in those codes and standards.c. Identify areas in codes and standards that are potentially in need ofrevision or enhancement and can benefit from activities conductedunder research and development.d. Develop input for new or revisions to existing codes and standardsthrough individual stakeholders, facilitated task forces, or throughlaboratory staff supporting these efforts.The purpose of this document is to support the above activities byproviding information on efforts being conducted by U.S. standardsdeveloping organizations (SDOs) and other entities that are focused onenergy storage system (ESS) safety. Note that IEC documents related toESS are listed on the last page of this document.The first draft report for NFPA 70(NEC) was posted June 25, 2018 ode 70&tab nextedition with a second draft publiccomment closing date of August 30,2018.Public comments on proposedchanges to the I-Codes are due July16, 2018.Change proposals to IEEE C-2(NESC) are due July 16, 2018.A third edition of UL 9540A wasreleased on June 15, 2018.A new edition of IEEE1635/ASHRAE Guideline 21,Guide forVentilation and Thermal Managementof Batteries for StationaryApplications, has been approved forpublication.The information is organized in relation to the scope of each documentrelative to energy storage systems from the ‘macro to the micro’ (e.g. overarching covering considerable scope,installation covering the application of an ESS to a building, facility or site, complete ESS being an ESS ‘product’and ESS component being a ‘part’ associated with an ESS). More ‘macro’ documents are likely to adopt byreference more ‘micro’ documents.Changes in current activity from the prior edition are shown in bold italics. Time-sensitive items (e.g. havinga schedule/due date) are in bold type and highlighted in yellow.1DOE OE Energy Storage Systems Safety Roadmap, PNNL-SA-126115 I SAND2017-5140 RPNNL-SA-135825

OVERARCHING CODES AND STANDARDSNational Fire Protection Association (NFPA)—www.nfpa.orgDocument:ESS relevance:Previous activity:Current activity:Date of next edition:Document:ESS relevance:Previous activity:Current activity:NFPA 1-18 Fire CodeChapter 52 (new in the 2018 edition) includes requirements related to theinstallation of ESS. Requirements recognize both established battery technologiesas well as new ESS technologies. Provisions apply to both new and existingapplications of ESS.The 2018 edition of NFPA 1 was issued in the Fall of 2017 and was updated toinclude a fully revised Chapter 52 which expanded the scope from stationarybattery systems to energy storage systems. The new ESS requirements addressbattery systems as well as other newer technologies (chemical, mechanical,thermal). Chapter 52 is organized as follows: 52.1 General 52.2 Lead-Acid and Nickel-Cadmium Batteries 52.2.1 General 52.2.2 Safety Features 52.3 Additional Battery Technologies 52.3.1 General 52.3.2 Stationary Storage Battery Systems 52.3.3 Capacitor Energy Storage SystemsAccess to the 2018 edition of NFPA 1 can be found at www.nfpa.org/1The public input closing date for the 2021 edition was June 27, 2018. A prefirst draft meeting was held May 30 and 31, 2018 in Denver, CO. l?code 1&tab nextedition for more information.The first draft meeting will be held September 18 and 19, 2018 and the firstdraft report is scheduled to be posted on March 27, 2019.2021NFPA 70-17 National Electrical CodeArticle 706 (new in the 2017 edition) applies to energy storage systems and Article480 remains applicable to batteries, in addition to other criteria in the NEC relevantto electrical equipment and installations.Proposed changes to the NEC were due September 7, 2017. Code Making Panel(CMP) public input reports (18) are posted at e 70&tab nextedition. CMP 13, Task Group 4 is responsiblefor review and recommending actions on 280 public inputs (PIs) to Sections 480and 706 of the NEC and provided recommendations on those PIs. A first draftmeeting was held January 8 to 20, 2018 in Hilton Head, SC to discuss and act onall PIs leading to the development of a first draft report. Efforts continue to compilethe outcome of the first draft meeting held January 8 to 20, 2018 that will comprisethe initial first draft report. A first draft meeting was held May 8 to 12, 2018 inDeerfield, IL.The first draft report was posted June 25, 2018 es-and-standards/list-of-2

Date of next edition:Document:ESS relevance:Previous activity:Current activity:Date of next edition:codes-and-standards/detail?code 70&tab nextedition and has a second draftpublic comment closing date of August 30, 2018.2020NFPA 5000-18 Building CodeProvides a basis for adoption and application of other standards.Finalization of the 2018 edition through the NFPA standards development processat the NFPA Technical Meeting in June 2017. The 2018 edition is available. Thepublic input closing date for the 2021 edition was June 27, 2018. ?code 5000&tab nextedition for moreinformation.The first draft meeting is scheduled for December 4 and 5, 2018 and the firstdraft is report is scheduled to be posted on February 27, 2019.2021International Code Council -development-cycle/Document:ESS relevance:Previous activity:2018 IFC (Fire Code)Chapter 12 of the IFC covers energy systems and Section 1206 in that chaptercovers electrical energy storage systems.Development of proposed changes to the International Fire Code (IFC) to betteraddress energy storage by proponents of individual changes to the IFC and alsoan ESS Advisory Group (AG) of the Fire Code Action Committee (FCAC).Changes approved pursuant to the ICC code development process, which wascompleted in 2016, were published in the 2018 edition of the IFC.The FCAC asked the ESS AG to continue their efforts and develop proposedchanges to the 2018 IFC that are focused on energy storage systems and tosubmit them to the FCAC for consideration. The ESS AG conducted a number ofphone meetings during the fall of 2017 leading up to finalization of proposedchanges to the IFC for presentation to the ICC FCAC and their consideration tosubmit them to the ICC by the January 8, 2018 deadline. The FCAC approvedcode change proposals, one of which is considered a comprehensive ESS rewritefor the IFC, and submitted them to the ICC for consideration during the2018/2019 code development cycle.One FCAC ESS code change proposal (F203-18) completely revises Section1206 and includes a revised outline for Section 1206 on energy storage toprovide a more user friendly way of organizing and presenting the requirements.Criteria cover electrochemical ESS and establish the scope of the provisions as afunction of technology type and energy capacity. Subsections covercommissioning, decommissioning and O&M, safety-related requirements for theESS equipment (e.g. product and its component parts) and then safety-relatedcriteria for all ESS installations, specific criteria related to size and separation,maximum allowable quantities, elevation, fire detection and suppression,enclosure size, vegetation control, and means of egress separation. In additionprovisions for exhaust ventilation, spill control and neutralization, explosioncontrol, safety caps and thermal runaway are also provided as a function oftechnology type. Additional criteria are also provided as a function of ESSlocation. A separate subsection covers mobile ESS.3

Current activity:Date of next edition:Document:ESS relevance:Previous activity:Current activity:Date of next edition:Document:ESS relevance:Previous activity:Current activity:Date of next edition:Document:ESS relevance:Previous activity:Current activity:Date of next edition:All proposed changes to the ICC International Codes (I-Codes) were postedFebruary 28, 2018 and committee action hearings held April 15 to 23, 2018 inColumbus, OH. 8-2019-CodeDevelopment-Schedule.pdf. See the PNNL/Sandia Special Briefing PaperUnofficial Hearing Results April 2018 (PNNL-SA-134254/SAND2018-4446R) standards/status-of-codesand-standards/ for a summary of changes to the I-Codes related to ESS. TheESS related proposals developed by the ESS AG and submitted by FCAC wereapproved (some with modifications) at the IFC hearings on April 22, 2018. Theofficial results of the committee action hearings are posted blic comments are due July 16, 2018 and the public comment agenda willbe posted August 31, 2018. The final action hearings following that publiccomment agenda will occur October 24 to 31, 2018 in Richmond, VA.20212018 IRC (Residential Code)A section of the International Residential Code (IRC) covers energy storagesystems.Development of proposed changes to better address energy storage safety withinthe IRC by proponents of individual changes to the IRC and also an advisorygroup of the Fire Code Action Committee (FCAC) and Building Code ActionCommittee. Changes approved pursuant to the ICC code development process,which was completed in 2016, will be published in the 2018 edition of the IRC.Those changes include some basic criteria to address the location and fire safetyof stationary battery systems.See current activity under the IFC above as to posting of proposed changes andcommittee action hearings. Note that changes addressing ESS in the IRC willlikely be heard in the 2019 code development cycle.20212018 IBC (Building Code)Provides a basis for adoption and application of other standards and ICC modelcodes.Changes to the 2018 International Building Code (IBC) support the new 2018 IFCESS requirements.See current activity under the IFC above as to posting of proposed changes andcommittee action hearings.20212018 IMC (Mechanical Code)Includes basic requirements for stationary fuel cell power systems and alsocriteria for ventilation and exhaust of spaces.No proposed changes to the International Mechanical Code (IMC) related toenergy storage systems were considered during the 2018 ICC code developmentcycle. Proposed changes to the IMC were due to ICC by January 8, 2018.See current activity under the IFC above as to posting of proposed changes andcommittee action hearings.20214

/nesc/Document:ESS relevance:Previous activity:Current activity:Date of next edition:Activity:ESS relevance:Previous activity:Current activity:Date of next edition:C2-17 National Electric Safety Code (NESC)Covers electrical safety for utility systems and equipment.Completion and publication of the 2017 edition of the NESC.The final date to receive change proposals from the public for revision ofthe 2017 edition leading to the 2022 edition is July 16, 2018. Seehttp://standards.ieee.org/about/nesc/ andhttp://standards.ieee.org/about/nesc/nesc 2022 schedule.pdf for moreinformation. NESC Sub-Committees will then meet in September andOctober of 2018 to consider all change proposals and preparerecommendations.August 1, 2021 for publication of the 2022 edition.IEEE Energy Storage and Stationary Battery Committee (ESSB)This is a growing subcommittee of the power and energy society that managesmany of the standards around energy storage and battery g held June 2017. The ESSB has engaged with IEEE SCC 21, publishersof the IEEE 157 series of DER and ESS interconnectivity standards to form anSCC 21/PES ESSB Energy Storage Task Force (ESTF). The ESTF will beholding web meetings on the 4th Friday of each month. The General Meeting ofthe ESSB was held January 22 to 26, 2018 in Jacksonville FL. It includedtechnical symposiums, and various Working Group sessions. One of thetechnical symposiums was a panel session on Safety Codes and Standardsaffecting Energy Storage. The ESSB met June 25 to 29, 2018 in Piscataway,NJ. Aside from their general meeting and meeting of the safety standardsworking group a number of their committees developing standards andguidelines related to ESS conducted business. See http://sites.ieee.org/pesessb/ for more information.An ESSB task force on codes and standards is organizing their future effortsassociated with development of IEEE standards related to ESS as well as layingout their involvement in the development of codes and standards by otherorganizations that are related to ESS.N/ADNV GL—www.dnvgl.com/rules-standards/Document:ESS relevance:Previous activity:DNVGL-RP-0043 Safety, Operation and Performance of Grid-connectedEnergy Storage Systems, December 2015 (GRIDSTOR)The objective of this document (GRIDSTOR) is to provide a comprehensive setof recommendations for grid-connected energy storage systems. It aims to bevalid in all major markets and geographic regions, for all applications, on alllevels from component to system, covering the entire life cycle. End users,operators and other stakeholders can find specific guidance in the document aswell as references to other relevant standards, codes and guidelines.First edition published in 2015 and a 2nd edition was developed and approved forpublic review (termed a public on-line hearing) in 2017. The document approved5

Current activity:Date of next edition:Document:ESS relevance:Previous activity:Current activity:Date of publication:for public review was sent to the rules and standards group in DNV GL whoinitiated an on-line hearing and made the document available for review toinvited/registered parties (those collected by DNV GL and others suggested to bealerted by DNV GL of this process). A public hearing started in early June andran until July 2, 2017. All input received during the public hearing process on the2nd edition draft was processed by DNV GL for consideration and final approval ofthe 2nd edition by those members of the consortium established to prepare andfinalize the 2nd edition. An internal meeting was held in August 2017 to finalizethe document. The second edition of the document was officially publishedSeptember 29, 2017.Supporting the recent 2nd edition of GRIDSTOR. 77 for more information.TBDHEATSTOR Joint Industry Project (JIP)The focus of HEATSTOR is on safety, operation and performance aspects ofheat storage systems. The objective of this document is to accelerateimplementation of heat storage systems through creation of a globally recognizedrecommended practice for system safety, operation and performance.None this is a new project.An invitation is out to join the consortium that will develop HEATSTOR. For moreinformation see try-project86759.TBD6

CODES AND STANDARDS FOR ESS INSTALLATIONSNational Fire Protection Association (NFPA)—www.nfpa.orgDocument:ESS relevance:Previous activity:Current activity:Date of first edition:Document:ESS relevance:Previous activity:Current activity:Date of next edition:NFPA 855 Standard for the Installation of Stationary Energy StorageSystemsThe standard covers the safety of all ESS and their installation in the builtenvironment. Chapters of the standard cover equipment, protection andinstallation, limitations on ESS capacity as a function of technology and locationand then also provide additional criteria focused on specific ESS technologies.Development of a draft standard by the technical committee from late 2016 untilMay 2017 and then formatting and editorial changes by NFPA staff resulting in adraft of the standard. The draft of the standard was considered by the NFPAStandards Council at their meeting in late August 2017. Information aboutsubmitting comments was provided at www.nfpa.org/855next and commentswere due October 4, 2017, during the First Draft Stage. Comments received fromthe First Draft Stage were discussed and acted upon by the NFPA 855Committee at their meetings in Dallas, TX on October 23 to 25, 2017 andChicago, IL November 27 to 30, 2017. Based on the actions at those meetings adecision on each of the public inputs was decided and in the aggregate resultedin the basis for a first draft report. The Technical Committee on Energy StorageSystems ballot on the first revisions closed April 30. 2018. Comments that weresubmitted as part of that ballot that were editorial were included in the seconddraft of the standard (and those that were not can be submitted during the publiccomment period.)The first draft report has been posted for public review and comment with aclosing date of July 12, 2018. See e 855&tab nextedition for more information on NFPA 855.A second draft meeting is scheduled for July 24 to 26, 2018 in Salt LakeCity, UT and the second draft report is scheduled to be posted November 1,2018.2020NFPA 1078 Standard for Electrical Inspector Professional QualificationsAddressed qualifications of those who would review and approve electrical plansand conduct electrical inspections. Such plan reviews and electrical inspectionswould include, but not be limited to, energy storage systems.In January NFPA invited comments by February 24, 2017, in support oropposition to the establishment of a committee to develop this new standard. Thisstandards project was approved by the NFPA Standards Council and NFPAsought interest from appropriate individuals to on the committee responsible forthis standard. This standard was open for public input with a closing date ofFebruary 14, 2018. See www.nfpa.org/1078 for more information. Public inputswere compiled and considered by the NFPA 1078 Technical Committee at theirmeeting February 26 to 28, 2018 in Houston, TX. During that meeting the NFPA1078 Committee considered 55 public inputs and approved 33 first revisions.The first draft report is being prepared and is scheduled to be posted August 22,2018. Public comment will close on October 31, 2018.20217

Document:ESS relevance:Previous activity:Current activity:Date of next edition:NFPA 78 Guide on Electrical Inspections (proposed edition).This documents covers the minimum criteria to aid in organizing and conductingelectrical inspections, including plan review and field inspection. Such planreviews and electrical inspections would include, but not be limited to, energystorage systems.This standards project was approved by the NFPA Standards Council and NFPAsought interest from appropriate individuals to on the committee responsible forthis standard. This standard was open for public input with a closing date ofFebruary 14, 2018. See www.nfpa.org/78 for more information. Public inputsreceived were compiled and considered by the NFPA 78 Technical Committee attheir meeting February 26 to 28, 2018 in Houston, TX. During that meeting theNFPA 78 Committee considered 45 public inputs and approved 24 first revisions.The first draft report is being prepared and is scheduled to be posted August 22,2018. Public comment will close on October 31, 2018.2021National Electrical Contractors Association (NECA)—www.necanet.orgDocument:ESS relevance:Previous activity:Current activity:Date of next edition:Document:ESS relevance:Previous activity:NECA 416-16 Recommended Practice for Installing Stored Energy SystemsNational Electrical Installation Standards (NEIS) are designed to improvecommunication among specifiers, purchasers, and suppliers of electricalconstruction services and are intended to be referenced in contract documentsfor electrical construction projects. NECA 416-17 describes installation practicesfor Energy Storage Systems (ESS) such as battery systems, flywheels, ultracapacitors, and smart chargers used for electric vehicle (EV) vehicle-to-grid(V2G) applications.Approved for publication. A new appendix containing a compliance checklist isunder development.Suggestions for revisions and improvements to this document are welcome andcan be directed to NECA at www.neca-neis.orgTBD based on current activity.NECA 417-201x Recommended Practice for Designing, Installing,Maintaining, and Operating Micro-gridsNational Electrical Installation Standards (NEIS) are designed to improvecommunication among specifiers, purchasers, and suppliers of electricalconstruction services and are intended to be referenced in contract documentsfor electrical construction projects. NECA 417 will cover the design, installation,maintenance and operation of micro-grids.Establishment of the drafting committee and drafting of the document for industryreview. This document addresses many workmanship, quality, and performanceissues related to the systems covered in the document. As NECA develops thecanvass group for the ANSI process, it will be important to include theappropriate canvass group members in a balanced approach. As with NECA416, the intention would be to include appropriate checklists for installers andinspection jurisdictions for consistency. A first draft was developed for industryreview. A call requesting interest in participating in the industry review of thedocument was sent out by NECA on December 8, 2017 with a deadline torespond by December 22, 2017. An industry review of the draft document wasopen until February 2, 2018 and NECA staff compiled the comments received8

Current activity:Date of next edition:and prepared a revised draft. NECA 417 was out for first balloting until May 14,2018. The draft was available for comment at and-maintaining-microgridsNECA staff are compiling the comments that were received during the publiccomment period for consideration by the drafting committee.The goal is to complete NECA-417 by mid-2018.IEEE—www.ieee.orgDocument:ESS relevance:Previous activity:Current activity:Date of next edition:Document:ESS relevance:Previous activity:Current activity:Date of next edition:IEEE 1635-12/ASHRAE Guideline 21-12 Guide for Ventilation and ThermalManagement of Batteries for Stationary ApplicationsCovers how energy storage systems are provided appropriate ventilation andthermal management.Proposed revisions were previously out for public review. Comments receivedduring the public review were being resolved. The Ventilation Working Groupresponsible for the document met on January 25, 2018 in conjunction with theIEEE ESSB meeting. A revised edition of the standard, based on input from thepublic review, was provided to IEEE RevCom, who makes recommendations forapproval or disapproval of standards submitted to the IEEE-SA Standards Board.Their approval for adoption is focused on whether IEEE-SA Standards Boardprocedural requirements have been satisfied.A new edition of the document has been approved and is at the editor andwill be published later this year.2018IEEE P1578 Recommended Practice for Stationary Battery Electrolyte SpillContainment and ManagementCovers how electrolyte spills can be contained and managed. Covered arevented lead-acid, valve regulated lead-acid, vented nickel-cadmium and partiallyrecombintant Ni-Cd batteries.The most recent edition was published in 2007. IEEE established a new projectand posted an invitation to enroll in the ballot group that closed August 24, 2017.The document was available for comment until November 4, 2017. Thecomments received were considered by the P1578 committee on January 25,2018 in conjunction with the IEEE ESSB meeting. The draft standard is availableat ml.The P1578 committee is going through the public comments, will beresponding to commenters and developing a revised draft for recirculationin July.TBD9

FM Global ument:ESS relevance:Previous activity:Current activity:Date of next edition:FM Global Property Loss Prevention Data Sheet # 5-33, Electrical EnergyStorage SystemsThe data sheet describes loss prevention recommendations for the design,operation, protection, inspection, maintenance, and testing of electrical energystorage systems. Energy storage systems can include batteries, batterychargers, battery management systems, thermal management and associatedenclosures and auxiliary systems. The focus of this data sheet is primarily onlithium-ion battery technology.Data sheet was published in January 2017.Work to update the data sheet is likely to start in late 2018.Development of an interim revision is planned for 2018 with publication expectedin 2019.10

CODES AND STANDARDS FOR A COMPLETE ESSAmerican Society of Mechanical Engineers (ASME)—www.asme.orgDocument:ESS relevance:Previous activity:Current activity:Date of next edition:TES-1 Safety Standard for Thermal Energy Storage SystemsProvides safety related criteria for molten salt thermal energy storage systems.Establishment of a standards committee and efforts to prepare a first draft ofthe standard. A first draft was developed and the standards committee met onJuly 20, 2017. An initial committee ballot was issued and the committeediscussed the results and further revisions during the meeting. The committeemet again on September 14, 2017, which resulted in a draft standard that wascirculated for a committee ballot. The ballot closed October 26, 2017 and thecommittee had a meeting via teleconference on November 2, 2017. Additionalmodifications to the draft were made in response to discussions during theNovember 2, 2017 meeting and were compiled in December for committeediscussion and a ballot to approve the draft for public review. The draft standardwas submitted for first consideration ballot and public review with a reviewperiod scheduled to close in late February. The link to the draft .cfm?thisfile PublicReviewDraft2339.pdf&dir ANSI.BSR8&43117.349919. The vote on the firstconsideration ballot was 9 for approval and 1 for disapproval resulting indisapproval by the TES Standards Committee and the ballot results returned tothe TES Committee for consideration. The TES Standards Committee (TESSC) had a conference call on March 15, 2018 to review the ballot commentsand revise the draft. Information was submitted for consideration in revising thedraft standard and a ballot to approve the minutes of the March 15, 2018 andaction items was sent to the TES SC for vote with a closing date of April 30,2018. The revised TES-1 Draft was circulated for First ConsiderationBallot to the Committee for formal vote with a deadline of May 30, 2018.The TES SC met on June 26, 2018 in Orlando, FL to consider comments.The draft is being revised to address committee comments received aspart of the formal vote and will be sent to the TES SC for approval.TBDNational Electrical Manufacturers Association—www.nema.orgDocument:ESS relevance:Previous activity:Current activity:Date of next edition:ESS-1-2017 Standard for Uniformly Measuring and Expressing thePerformance of Electrical Energy Storage SystemsProvides safety related criteria for electrical energy storage systems.Establishment of a canvass committee and efforts to prepare a first draft of thestandard. A first draft was developed and the canvass committee revised thedraft. The goal of incorporating necessary revisions in preparation for acommittee ballot of the draft was late December 2017. The first draft has beencompleted, was sent out for NEMA ballot to their Energy Storage Section andapproved.The standard was approved by the NEMA Codes and Standards Committee andis currently being balloted through ANSI. The ballot closes July 2, 2018.August 201811

National Fire Protection Association (NFPA)—www.nfpa.orgDocument:ESS relevance:Previous activity:Current activity:Date of next edition:NFPA 791 - Recommended Practice and Procedures for Unlabeled ElectricalEquipmentCould form a basis for assessing an energy storage system that is not labeled.Note that recommended practices are guides and are not documents that can beenforced by jurisdictions.The 2018 edition was finalized earlier in 2017 and is available. The public inputclosing date for the 2021 edition was June 27, 2018. ?code 791&tab nextedition for moreinformation about NFPA

2 OVERARCHING CODES AND STANDARDS National Fire Protection Association (NFPA)—www.nfpa.org Document: NFPA 1-18 Fire Code ESS relevance: Chapter 52 (new in the 2018 edition) includes requirements related to the

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Table of Contents Section 1 Introduction 4 Section 2 Energy Storage Technologies 6 2.1 Mechanical storage 6 2.1.1 Pumped hydro storage 6 2.1.2 Compressed air energy storage 7 2.1.3 Flywheels 8 2.2 Electrochemical energy storage (batteries) 9 2.2.1 Conventional batteries 9 2.2.2 High temperature batteries 9 2.2.3 Flow batteries 10 2.3 Chemical energy storage 11 2.3.1 Hydrogen (H2) 12

3. Thermal Energy Storage 18 3.1 Thermal Energy Storage Approaches 19 3.2 Sensible Heat Storage 19 3.3 Large-Scale Sensible Heat Stores 22 3.4 Latent Heat Storage 25 3.5 Thermochemical Heat Storage 28 3.6 Summary 29 4. Potential for Thermal Energy Storage in the UK Housing Stock 30 4.1 Introduction 31 4.2 The Approach Adopted 31 4.3 Modelling 31