Standards and alliances · verified 26 Oct 2026

Industrial protocol standards and alliances

Find the organizations that develop, maintain, test and promote industrial communication protocols. Compare how to take part, what it costs and which interoperability programs are open to you, with the official source for every fact.

Organizations: 16
Standards covered: 12
Published fees and free tiers: 49
Free or open routes for individuals: 12

An independent, community-maintained reference. Listing an organization does not mean OT Fabric is a member of it, endorsed by it or working with it. Fees are the published examples on the date shown, not quotes.

16 organizations

Standards body · Buildings

ASHRAE

Publishes ANSI/ASHRAE Standard 135 (BACnet) through its BACnet Committee, SSPC 135.

BACnet/IP

From $30 (Student)

Partly Free specs
No Free for individuals
Unknown Open working groups
Not applicable Certify without joining

Membership, programs and sources

Participation

Can anyone read the specifications for free?: Partly135-2024 is available as a free, read-only PDF; downloadable copies and other editions are sold through the ASHRAE and ISO stores. bacnet.org
Can anyone take part in the community?: PartlySSPC 135 invites volunteers to join its working groups; the pages we checked do not say whether ASHRAE membership is required. bacnet.org
Can an individual take part for free?: NoMembership runs from $30 for students to $290 for full members, with reduced dues in developing economies. ashrae.org
Can an organization join for free?: Not applicableASHRAE membership is for individuals.
Are technical working groups open to non-members?: UnknownThe BACnet Committee lists 11 working groups and a volunteer page; non-member eligibility is not stated. bacnet.org
Can non-members take part in interoperability testing?: Not applicableTesting and certification are run by BACnet International.
Can a non-member certify a product?: Not applicableTesting and certification are run by BACnet International.
Does it maintain or host open-source implementations?: UnknownWe found no open-source project maintained by ASHRAE.

Membership tiers

Tier	Published fee	Who can join	Votes	Working groups	Source
Student	$30 a year	Enrolled in an approved course of study; $15 in developing economies.	Unknown	Unknown	ashrae.org
Affiliate	$75 to $145 a year	New members under 30 or recent military veterans, for up to three years ($75, $110, $145).	Unknown	Unknown	ashrae.org
Full Member or Associate	$290 a year	Full Member needs 12 approved years of education and experience; Associate needs HVAC&R work experience. $175 in developing economies.	Unknown	Unknown	ashrae.org

Verified 23 Oct 2026 · re-check by 21 Apr 2027 · BACnet Committee (SSPC 135) · Buying the BACnet standard · ASHRAE membership

Industry alliance · Buildings

BACnet International

Promotes BACnet and runs BTL testing, certification and the PlugFest; free individual participation.

BACnet/IP

Free: Individual participation

Not applicable Free specs
Yes Free for individuals
Unknown Open working groups
Yes Certify without joining

Membership, programs and sources

Participation

Can anyone read the specifications for free?: Not applicableBACnet International does not publish the standard; ASHRAE does.
Can anyone take part in the community?: Yes"Individual participation is free", including a General Interest category open to anyone not tied to a corporate member. bacnetinternational.org
Can an individual take part for free?: YesFree categories for employees of corporate members, instructors, students and general-interest individuals. bacnetinternational.org
Can an organization join for free?: NoCorporate memberships (Platinum, Gold, Silver, Affiliate) are paid; fees are given on request. bacnetinternational.org
Are technical working groups open to non-members?: UnknownThe individual page does not mention committees or working groups.
Can non-members take part in interoperability testing?: Yes"PlugFest welcomes all developers, at any stage of their product engineering." Fees and membership rules are not stated. bacnetinternational.org
Can a non-member certify a product?: YesBTL certification does not require membership. Non-members pay an annual listing fee of $2,500 per product; corporate members in good standing are exempt. btl.org
Does it maintain or host open-source implementations?: UnknownWe found no open-source project maintained by BACnet International.

Membership tiers

Tier	Published fee	Who can join	Votes	Working groups	Source
Individual participation	Free	Employees of corporate members, instructors, full-time students, and anyone interested in BACnet.	Unknown	Unknown	bacnetinternational.org
Corporate (Platinum, Gold, Silver)	On request	Manufacturers and OEMs of BACnet software, hardware or related services.Half the hourly BTL Lab rate, included or discounted BTL listings, PlugFest discounts and test tool licences.	Unknown	Unknown	bacnetinternational.org
Corporate Affiliate	On request	Manufacturers and OEMs that support BACnet Interest Groups outside the United States.	Unknown	Unknown	bacnetinternational.org

Certification and interoperability

CertificationBTL certificationTesting at a Recognized BACnet Testing Organization, then a free application and an annual listing fee of $2,500 per product for non-members.
PlugfestBTL PlugFestInteroperability workshop for developers; corporate members get registration discounts.

Verified 23 Oct 2026 · re-check by 21 Apr 2027 · Individual participation · Corporate membership · BTL certification process · PlugFest FAQ

Industry alliance · EV charging

CharIN

Promotes the CCS, MCS and NACS charging interfaces, with working groups and Testivals.

From €5,000 (Startup)

Unknown Free specs
Not applicable Free for individuals
No Open working groups
Unknown Certify without joining

Membership, programs and sources

Participation

Can anyone read the specifications for free?: UnknownWe have not yet verified document access.
Can anyone take part in the community?: UnknownTestivals and conferences are promoted publicly; access rules are not stated on the membership page.
Can an individual take part for free?: Not applicableMembers are companies and organizations. charin.global
Can an organization join for free?: NoEven the startup rate is €5,000 per calendar year. charin.global
Are technical working groups open to non-members?: NoRegular members join one or more working groups; startups get one. charin.global
Can non-members take part in interoperability testing?: UnknownTestivals are promoted but the membership page does not say who can attend.
Can a non-member certify a product?: UnknownNot verified yet.
Does it maintain or host open-source implementations?: UnknownNot verified yet.

Membership tiers

Tier	Published fee	Who can join	Votes	Working groups	Source
Startup	€5,000 per calendar year	Gross revenue under €3M, registered for less than four years, and not controlled by a Regular or Core member. Moves to the Regular rate from year three.No initiation fee; access to one working group.	Unknown	Yes	charin.global
Regular	Not published	Suppliers, utilities, public authorities, IT firms and non-profits.Fees are in a dues schedule linked from the membership page, not on the page itself.	Unknown	Yes	charin.global
Core	Not published	Founding members, and members that meet further criteria.	Unknown	Yes	charin.global

Verified 23 Oct 2026 · re-check by 21 Apr 2027 · Membership benefits · Membership for startups (PDF)

User group · Energy and DER

DNP Users GroupDNP-UG

Supports DNP3 (IEEE 1815) users, holds the member document library and runs conformance testing.

DNP3

Free: Emeritus · paid from $1 (Academic)

No Free specs
Partly Free for individuals
Unknown Open working groups
Yes Certify without joining

Membership, programs and sources

Participation

Can anyone read the specifications for free?: NoMember-only documents, including standards, are reserved for active members. IEEE 1815 itself is sold by IEEE. dnp.org
Can anyone take part in the community?: PartlyWorkshops are included in every membership category, including the $1 academic category. dnp.org
Can an individual take part for free?: PartlyAcademic membership is $1 for up to three years and Emeritus is $0, both non-commercial. The $400 Individual category is for personal, non-commercial use only. dnp.org
Can an organization join for free?: NoCommercial members start with Micro vendor at $500. dnp.org
Are technical working groups open to non-members?: UnknownThe fee guide does not list technical committee access per category.
Can non-members take part in interoperability testing?: UnknownWe found no public interoperability event.
Can a non-member certify a product?: YesNon-members can buy conformance test access at $15,000 per project; members get 0 to 100% discounts on the $1,200 (P1) and $2,400 (P2) per-interface services. dnp.org
Does it maintain or host open-source implementations?: UnknownWe found no open-source project maintained by the group.

Membership tiers

Tier	Published fee	Who can join	Votes	Working groups	Source
Academic	$1 a year	Full-time students or faculty, up to three years, non-commercial.	Unknown	Unknown	dnp.org
Emeritus	Free	Retired individuals with at least 10 years of active engagement; non-commercial.	Unknown	Unknown	dnp.org
Individual	$400 a year	Personal, non-commercial use only. Commercial members must choose a company category.	Unknown	Unknown	dnp.org
Micro vendor	$500 a year	Vendors with $0 to $1M of DNP3-related revenue; one user.50% discount on one P1 conformance test service a year.	Unknown	Unknown	dnp.org
Vendors, small to large	$2,000 to $15,000 a year	Small ($1M to $20M) $2,000, medium ($20M to $100M) $6,000, large (over $100M) or undeclared $15,000.	Unknown	Unknown	dnp.org
Utilities	$1,000 to $15,000 a year	Water utilities and small munis or co-ops $1,000, up to very large utilities (over $20B revenue) at $15,000.	Unknown	Unknown	dnp.org
Research organization	$5,000 a year	Research organizations such as national labs.	Unknown	Unknown	dnp.org

Certification and interoperability

Conformance testingDNP3 conformance testing (CCP / CTR)Standard prices are $1,200 for P1 and $2,400 for P2 per device interface; non-members can buy access at $15,000 per project. Fees effective since 1 July 2024.

Verified 23 Oct 2026 · re-check by 21 Apr 2027 · Member fee guide

Open-source foundation · Industrial

Eclipse Foundation

Open-source foundation hosting Eclipse Milo (OPC UA); committer membership is free.

OPC UA

Free: Committer · paid from €1,000 (Contributing)

Not applicable Free specs
Partly Free for individuals
Unknown Open working groups
Not applicable Certify without joining

Membership, programs and sources

Participation

Can anyone read the specifications for free?: Not applicableThe foundation hosts software, not protocol specifications.
Can anyone take part in the community?: UnknownThe membership page does not say whether non-members can contribute; we have not yet checked the contributor terms.
Can an individual take part for free?: Partly"There is no cost to being a Committer member", for committers whose employer is not already a member. eclipse.org
Can an organization join for free?: PartlyAssociate membership is €0 for government, research, academic and user-group organizations. eclipse.org
Are technical working groups open to non-members?: UnknownIndustry working groups have their own participation agreements; not verified yet.
Can non-members take part in interoperability testing?: Not applicableThe foundation does not run protocol test events.
Can a non-member certify a product?: Not applicableThe foundation does not certify OPC UA products.
Does it maintain or host open-source implementations?: YesHosts Eclipse Milo (iot.milo). projects.eclipse.org

Membership tiers

Tier	Published fee	Who can join	Votes	Working groups	Source
Committer	Free	Committers on Eclipse projects whose employer is not a member.	Unknown	Unknown	eclipse.org
Associate	€0 to €25,000 a year	€0 for governments, research, NGOs, academia and user groups; companies pay by revenue, from €1,500 (under €1M and fewer than 10 employees) to €25,000.	Unknown	Unknown	eclipse.org
Contributing	€1,000 to €25,000 a year	€1,000 for academic and user-group organizations; companies pay by revenue, from €1,500 (under €1M and fewer than 10 employees) to €25,000.	Unknown	Unknown	eclipse.org
Strategic	€30,000 to €300,000 a year	By revenue, from €30,000 to €300,000.	Yes	Unknown	eclipse.org

Verified 23 Oct 2026 · re-check by 21 Apr 2027 · Membership and fees · Eclipse Milo project

Standards body · Energy and DER

IEEE Standards AssociationIEEE SA

Publishes IEEE 1815 (DNP3) and IEEE 2030.5; working-group participation is open to everyone.

DNP3 IEEE 2030.5

Free: Non-member participant · paid from $79 (IEEE SA, with IEEE membership)

No Free specs
Partly Free for individuals
Yes Open working groups
Not applicable Certify without joining

Membership, programs and sources

Participation

Can anyone read the specifications for free?: NoIEEE 2030.5-2023 and the P1815 draft are sold or available by subscription. The IEEE GET program does not list either. standards.ieee.org
Can anyone take part in the community?: Yes"Participation in individual-based standards development is open to everyone." standards.ieee.org
Can an individual take part for free?: PartlyWorking-group participation needs no membership. Balloting does: members ballot freely, others pay a per-ballot fee. standards.ieee.org
Can an organization join for free?: UnknownWe have not yet verified entity membership terms.
Are technical working groups open to non-members?: YesIndividual-based working groups are open to everyone; membership is needed to lead groups. standards.ieee.org
Can non-members take part in interoperability testing?: Not applicableIEEE SA does not run the testing programs for these standards.
Can a non-member certify a product?: Not applicableCertification for IEEE 2030.5 / CSIP is run by SunSpec; for DNP3 by the DNP Users Group.
Does it maintain or host open-source implementations?: Not applicableIEEE SA publishes standards, not software.

Membership tiers

Tier	Published fee	Who can join	Votes	Working groups	Source
Non-member participant	Free	Anyone can take part in individual-based standards development.Balloting is possible for a per-ballot fee.	Partly	Yes	standards.ieee.org
IEEE SA, with IEEE membership	$79 a year	Current IEEE or society members. $49 for students, developing nations and affiliates.2027 dues as published.	Yes	Yes	saforms.ieee.org
IEEE SA only	$325 a year	Without IEEE membership.2027 dues as published.	Yes	Yes	saforms.ieee.org

Verified 23 Oct 2026 · re-check by 21 Apr 2027 · Individual membership FAQ · Individual membership dues · IEEE 2030.5-2023 · P1815 (DNP3) project · IEEE GET program

Standards body · Energy and DER, Industrial

International Electrotechnical CommissionIEC

Publishes IEC 61850 and IEC 60870-5 through TC 57, and the IEC 61158 and 61784 fieldbus series through SC 65C; experts join via national committees.

IEC 61850 / MMS IEC 61850 information model IEC 60870-5-104 EtherNet/IP

Fees not published

No Free specs
Not applicable Free for individuals
No Open working groups
Not applicable Certify without joining

Membership, programs and sources

Participation

Can anyone read the specifications for free?: NoStandards are sold through the IEC webstore. The complete IEC 61850 series pack lists at CHF 26,508. webstore.iec.ch
Can anyone take part in the community?: NoCommittee work is done by experts nominated through the national committee of their country. tc3.iec.ch
Can an individual take part for free?: Not applicableThe IEC has no individual membership; individuals take part as nominated experts.
Can an organization join for free?: Not applicableMembers of the IEC are national committees, not companies.
Are technical working groups open to non-members?: No"Each NC (National Committee) can appoint experts to take part in specific technical work." Conditions and costs depend on the national committee. tc3.iec.ch
Can non-members take part in interoperability testing?: Not applicableTC 57 writes standards; IEC 61850 interoperability testing is organized by UCAIug.
Can a non-member certify a product?: Not applicableTC 57 does not certify products.
Does it maintain or host open-source implementations?: Not applicableTC 57 publishes standards, not software.

Membership tiers

Tier	Published fee	Who can join	Votes	Working groups	Source
Expert, nominated by a national committee	Not published	Experts nominated by the national committee of their country of residence, such as the Standards Council of Canada's mirror committee for TC 57.Whether national participation costs anything depends on the country.	Unknown	Yes	tc3.iec.ch

Verified 26 Oct 2026 · re-check by 24 Apr 2027 · IEC TC 57 · How experts get involved · IEC 61850 series in the IEC webstore · SCC mirror committee for TC 57 · IEC 61784-1-2 (CPF 2) in the IEC webstore · IEC 61784-1-2 preview: CP 2/1 ControlNet, CP 2/2 EtherNet/IP, CP 2/3 DeviceNet

Professional society · Industrial

International Society of AutomationISA

Publishes the ISA/IEC 62443 OT security series; standards committees are open without membership.

Free: Committee participant · paid from $15 (Student)

Partly Free specs
Partly Free for individuals
Yes Open working groups
Unknown Certify without joining

Membership, programs and sources

Participation

Can anyone read the specifications for free?: PartlyMembers get online viewing of more than 150 ISA standards; the page does not name 62443 specifically. isa.org
Can anyone take part in the community?: YesStandards committee participation "shall be open to all parties who are directly and materially interested". isa.org
Can an individual take part for free?: PartlyCommittee participation needs only a free ISA account; membership itself starts at $15 for students and $170 for professionals. isa.org
Can an organization join for free?: Not applicableISA membership is for individuals.
Are technical working groups open to non-members?: Yes"ISA membership is not a requirement for participation in standards committees." New members usually start as non-voting information members. isa.org
Can non-members take part in interoperability testing?: Not applicableISA does not run protocol interoperability events.
Can a non-member certify a product?: UnknownWe have not verified product certification against 62443 yet.
Does it maintain or host open-source implementations?: UnknownNot verified yet.

Membership tiers

Tier	Published fee	Who can join	Votes	Working groups	Source
Committee participant	Free	Anyone directly and materially interested, with a free ISA account.New members usually join as non-voting information members.	Partly	Yes	isa.org
Student	$15 a year	–	Unknown	Unknown	isa.org
Professional	$170 a year	$85 in eligible countries.	Unknown	Unknown	isa.org

Verified 23 Oct 2026 · re-check by 21 Apr 2027 · Join ISA · Join a standards committee

Open-source foundation · Energy and DER, EV charging

LF Energy

Linux Foundation home for open-source energy software, including EVerest, CitrineOS, OpenLEADR and CoMPAS.

OCPP OpenADR IEC 61850 / MMS

Free: Contributor, no membership · paid from $5,000 (General)

Not applicable Free specs
Yes Free for individuals
Yes Open working groups
Not applicable Certify without joining

Membership, programs and sources

Participation

Can anyone read the specifications for free?: Not applicableLF Energy does not publish the protocols in this directory.
Can anyone take part in the community?: Yes"You can use every project, contribute to any of them, and never pay a cent." lfenergy.org
Can an individual take part for free?: YesContributing to projects and joining SIGs needs no membership. tac.lfenergy.org
Can an organization join for free?: PartlyAssociate membership is free for eligible open-source projects, non-profits, academic institutions and government research bodies, subject to Governing Board approval. lfenergy.org
Are technical working groups open to non-members?: Yes"SIGs are open for anyone to participate in." tac.lfenergy.org
Can non-members take part in interoperability testing?: Not applicableLF Energy does not run protocol test events.
Can a non-member certify a product?: Not applicableLF Energy does not certify products.
Does it maintain or host open-source implementations?: YesHosts 39 projects, including EVerest, CitrineOS, openLEADR, CoMPAS and SEAPATH. lfenergy.org

Membership tiers

Tier	Published fee	Who can join	Votes	Working groups	Source
Contributor, no membership	Free	Anyone: use and contribute to every project, and join SIGs.	Unknown	Yes	lfenergy.org
Associate	Free	Open-source projects, non-profits, academic institutions and government research bodies, with Governing Board approval.	Unknown	Yes	lfenergy.org
General	$5,000 to $70,000	By employee count: $10,000 (up to 99) to $70,000 (5,000+) for organizations not yet in the Linux Foundation; $5,000 to $50,000 for current LF members.Eligible to stand for the Governing Board.	Partly	Yes	lfenergy.org
Strategic	$150,000 to $170,000	$170,000, or $150,000 for current Linux Foundation members.Seats on the Governing Board, the Technical Advisory Council and the LFESS Steering Committee.	Yes	Yes	lfenergy.org

Verified 23 Oct 2026 · re-check by 21 Apr 2027 · Join LF Energy · Special interest groups · Projects · openLEADR project

User group · Industrial, Energy and DER, Buildings

Modbus Organization

Maintains the Modbus specifications and runs a conformance self-test and logo program.

Modbus

From $35 (Student)

Unknown Free specs
No Free for individuals
Unknown Open working groups
Unknown Certify without joining

Membership, programs and sources

Participation

Can anyone read the specifications for free?: UnknownThe site offers the current specifications and implementation guides for download, but the pages we checked do not state the access terms. modbus.org
Can anyone take part in the community?: UnknownCommittees, trade shows and demos are listed as member benefits; participation for non-members is not described.
Can an individual take part for free?: NoIndividual membership is $60; Student membership is $35. modbus.org
Can an organization join for free?: NoCompany memberships start at $500 (Supporting) and $1,500 (General). modbus.org
Are technical working groups open to non-members?: UnknownCommittee participation is listed for every member category; the page does not say whether non-members can join.
Can non-members take part in interoperability testing?: UnknownThe Conformance Self-Test Program is listed as a General member benefit; non-member access is not stated. modbus.org
Can a non-member certify a product?: UnknownGeneral members get discounts on conformance testing; the page does not say whether non-members can test.
Does it maintain or host open-source implementations?: UnknownThe Modbus TCP Developers Toolkit is free to General members and for sale to others; we found no open-source reference stack.

Membership tiers

Tier	Published fee	Who can join	Votes	Working groups	Source
General	$1,500 to $3,500	Organizations that supply or use Modbus devices. $1,500 under 99 employees, $2,500 for 100 to 999, $3,500 for 1,000 or more.One vote; Conformance Self-Test Program, logo program and the Modbus TCP Developers Toolkit.	Yes	Yes	modbus.org
Supporting	$500	Companies providing system integration services with Modbus.	Unknown	Yes	modbus.org
Education institution	$500	–	Unknown	Yes	modbus.org
Individual	$60	–	Unknown	Yes	modbus.org
Student	$35	–	Unknown	Yes	modbus.org

Certification and interoperability

Conformance testingConformance Self-Test ProgramA member benefit for General members, with discounts on conformance testing.

Verified 23 Oct 2026 · re-check by 21 Apr 2027 · Membership information · Technical resources

Industry alliance · Industrial

ODVA

Maintains CIP and EtherNet/IP, licenses vendors, runs conformance testing and hosts the PlugFest interoperability events.

EtherNet/IP

Fees not published

No Free specs
Not applicable Free for individuals
Unknown Open working groups
Partly Certify without joining

Membership, programs and sources

Participation

Can anyone read the specifications for free?: NoThe specifications are sold as annual subscriptions, updated twice a year, and need signed Terms of Usage first. Prices are on the order form only. odva.org
Can anyone take part in the community?: PartlyPlugFest events are open without membership; Special Interest Groups are listed as a member benefit. odva.org
Can an individual take part for free?: Not applicableMembership is limited to Licensed Vendors of ODVA technologies, which are companies. odva.org
Can an organization join for free?: Not publishedMembership levels and fees are not published on the pages we checked; the order form only lists member discounts.
Are technical working groups open to non-members?: UnknownJoining Special Interest Groups is listed as a member benefit; we found no statement on access for non-members.
Can non-members take part in interoperability testing?: YesThe PlugFest page states that ODVA membership is not required. odva.org
Can a non-member certify a product?: PartlyConformance testing needs no membership, but the vendor must be a Licensed Vendor, with signed Terms of Usage, a vendor ID, a specification subscription and a conformance test software subscription. odva.org
Does it maintain or host open-source implementations?: UnknownThe developer hub offers ODVACompress source code after registration; we found no open-source protocol stack maintained by ODVA. OpENer is maintained by the independent EIP Stack Group.

Membership tiers

Tier	Published fee	Who can join	Votes	Working groups	Source
Licensed Vendor	Not published	A company that signs the ODVA Application and Agreement for Membership and Terms of Usage, the technology licence; needed before buying specifications or a vendor ID.Pays the non-member price for specifications, vendor IDs and test software.	Unknown	Unknown	odva.org
Associate member	Not published	Licensed Vendors that can show intent to make and sell products using ODVA technologies.25% discount on specifications, vendor IDs and conformance test software.	Unknown	Unknown	odva.org
Regular or Principal member	Not published	Licensed Vendors.50% discount on specifications, vendor IDs and conformance test software.	Unknown	Unknown	odva.org

Certification and interoperability

Conformance testingODVA conformance testingEvery product with ODVA technology must pass vendor-independent conformance testing, which results in a Declaration of Conformity. Test service providers: ODVA in Ann Arbor (USA), TÜV Rheinland in Yokohama (Japan) and Taicang (China), and Otto-von-Guericke-Universität Magdeburg (Germany). Fees are not published.
Test toolODVA conformance test softwareA subscription that vendors must buy before conformance test services; members get 25% or 50% off.
PlugfestEtherNet/IP PlugFestA three-day event where vendors exercise their products against other vendors' in a live system, using ODVA's interoperability test procedures (Pub 95).

Verified 26 Oct 2026 · re-check by 24 Apr 2027 · Getting started: specifications, vendor ID and Terms of Usage · Conformance testing · Test service provider locations · PlugFest · Membership application · Membership benefits · Specification, vendor ID and test software order form · Developer hub

Industry alliance · Industrial, Energy and DER, Buildings

OPC Foundation

Develops OPC UA, runs certification test labs and maintains the open-source .NET reference stack.

OPC UA

Free: UA Logo · paid from $500 (Startup)

Yes Free specs
Not applicable Free for individuals
No Open working groups
Partly Certify without joining

Membership, programs and sources

Participation

Can anyone read the specifications for free?: YesThe benefits table gives non-members access to the OPC UA specifications. OPC Classic specifications are for members. opcfoundation.org
Can anyone take part in the community?: PartlySpecifications and the open-source stack are public; working groups need a paid membership. opcfoundation.org
Can an individual take part for free?: Not applicableMembership is for organizations; there is no individual category. opcfoundation.org
Can an organization join for free?: PartlyThe UA Logo membership is $0 for companies that offer OPC UA products. It gives certification access but no voting and no working groups. opcfoundation.org
Are technical working groups open to non-members?: NoWorking groups are open to Corporate, Startup, End-User and Non-Voting members, not to UA Logo members or non-members. opcfoundation.org
Can non-members take part in interoperability testing?: UnknownInteroperability workshops are listed on the certification pages; we found no published eligibility.
Can a non-member certify a product?: PartlyCertification is "a premium service available to OPC Foundation members and logo members", so it needs at least the free UA Logo membership. opcfoundation.org
Does it maintain or host open-source implementations?: YesMaintains the UA-.NETStandard reference stack on GitHub. github.com

Membership tiers

Tier	Published fee	Who can join	Votes	Working groups	Source
UA Logo	Free	Companies that offer OPC UA products.Certification lab access at the logo-member rate; test tools as a service.	No	No	opcfoundation.org
Startup	$500 a year	First five years and revenue under $2M.Compliance test tools and certification lab access included.	Yes	Yes	opcfoundation.org
Non-Voting	$900 a year	Government, research, universities and non-profits that do not build or market OPC products.	No	Yes	opcfoundation.org
End-User	$1,800 a year	Organizations that use OPC-based products.	Yes	Yes	opcfoundation.org
Corporate, classes D to A	$3,000 to $18,000 a year	By annual sales: Class D under $2M ($3,000), C $2M to $20M ($4,800), B $20M to $100M ($9,600), A $100M to $1B ($18,000).Free compliance test tools; 50% discount at the certification lab.	Yes	Yes	opcfoundation.org
Corporate, classes AA and AAA	Unknown	Sales over $1B.The dues table shows two 2027 figures per class without saying which applies, so we do not repeat them here.	Yes	Yes	opcfoundation.org

Certification and interoperability

CertificationOPC UA certificationTesting at an OPC Foundation accredited Certification Test Lab: €900 per day for Corporate members, €1,800 per day for logo members. A server usually takes 3 to 7 days, a client 5 to 10.
Test toolCompliance Test Tool (CTT)Free for Corporate and Startup members; offered as a service to End-User, Non-Voting and UA Logo members.

Verified 23 Oct 2026 · re-check by 21 Apr 2027 · Membership benefits and dues · Certification overview · Certification lab registration

Industry alliance · EV charging, Energy and DER

Open Charge AllianceOCA

Develops OCPP, publishes it free, and runs certification, the OCTT test tool and plugfests.

OCPP

Free: Liaison · paid from €297 (Individual)

Yes Free specs
No Free for individuals
No Open working groups
Yes Certify without joining

Membership, programs and sources

Participation

Can anyone read the specifications for free?: Yes"OCPP is freely available for everyone to download." openchargealliance.org
Can anyone take part in the community?: PartlyPlugfests welcome everyone in the industry; working and task groups are for members. openchargealliance.org
Can an individual take part for free?: NoIndividual membership is €297 a year. openchargealliance.org
Can an organization join for free?: PartlyLiaison membership is free, but only for standards bodies and supportive organizations that fit no other category. openchargealliance.org
Are technical working groups open to non-members?: NoThe Technical and Compliance working groups are member benefits. openchargealliance.org
Can non-members take part in interoperability testing?: Yes"Everyone from the EV charging industry is welcome to participate" in plugfests, held several times a year. OCTT Starter is free. openchargealliance.org
Can a non-member certify a product?: Yes"Every company involved with an OCPP implementation can get an official independent OCPP Certificate"; members get discounts. openchargealliance.org
Does it maintain or host open-source implementations?: UnknownOpen-source OCPP stacks exist (EVerest and CitrineOS at LF Energy); we found none maintained by OCA.

Membership tiers

Tier	Published fee	Who can join	Votes	Working groups	Source
Liaison	Free	Standards-setting or defining bodies (SSOs/SDOs) and supportive organizations that fit no other category. IEC experts can join as Liaison Participants.	Unknown	Unknown	openchargealliance.org
Individual	€297 a year	People with a professional interest in developing, distributing, installing, maintaining or using OCA standards.	Unknown	Yes	openchargealliance.org
Institutional	€990 a year	Research and consulting groups, laboratories, regulators and universities.	Unknown	Yes	openchargealliance.org
Implementer	€990 to €8,250 a year	Vendors of hardware or software implementing OCA standards. Revenue under 1M €990, 1M to 10M €2,475, 10M to 50M €4,950, over 50M €8,250.OCTT Professional at the participant rate.	Unknown	Yes	openchargealliance.org
Adopter	€990 to €8,250 a year	Organizations that deploy charging networks with OCA standards, including grid owners and operators. Same revenue bands as Implementer.	Unknown	Yes	openchargealliance.org

Certification and interoperability

CertificationOCPP certificationRun with independent test laboratories, including Dekra, DNV, the Korea Smart Grid Association, KTC and KTL.
Test toolOCPP Compliance Test Tool (OCTT)OCTT Starter is free with more than 300 core test cases. OCTT Professional is €7,900 a year for Adopter and Implementer members and €17,900 a year for others.
PlugfestOCPP PlugfestSeveral hands-on testing events a year at partner locations worldwide.

Verified 23 Oct 2026 · re-check by 21 Apr 2027 · Join us · FAQ · Certification program · Test tool · OCPP Plugfest

Industry alliance · Energy and DER

OpenADR Alliance

Maintains the OpenADR 2.0 and 3.0 specifications and certifies OpenADR products.

OpenADR

From $1,500 (Adopter)

Yes Free specs
Not applicable Free for individuals
No Open working groups
No Certify without joining

Membership, programs and sources

Participation

Can anyone read the specifications for free?: Yes"The specifications are license free but copyright of the OpenADR Alliance." Downloads go through a form with terms. openadr.org
Can anyone take part in the community?: NoCommittees, task groups and the member forums are for members. openadr.org
Can an individual take part for free?: Not applicableThere is no individual category. openadr.org
Can an organization join for free?: NoContributor and Adopter memberships start at $1,500 a year. openadr.org
Are technical working groups open to non-members?: NoCommittees and task groups are member benefits. openadr.org
Can non-members take part in interoperability testing?: UnknownThe membership page does not mention plugfests.
Can a non-member certify a product?: NoContributor and Sponsor members can test and certify products; Adopters cannot. openadr.org
Does it maintain or host open-source implementations?: UnknownOpen-source OpenADR stacks exist (OpenLEADR at LF Energy, EPRI's VEN and VTN); we found none maintained by the Alliance.

Membership tiers

Tier	Published fee	Who can join	Votes	Working groups	Source
Adopter	$1,500 a year	Non-manufacturers: consumers, government, research agencies, test houses and regulators.Votes through committees and task groups; cannot certify products.	Partly	Yes	openadr.org
Contributor	$1,500 to $7,500 a year	Vendors of hardware, software or services. Under $1M revenue $1,500, $1M to $10M $3,000, $10M to $100M $5,000, over $100M $7,500.Can test and certify products; IPR use for compliant products.	Yes	Yes	openadr.org
Sponsor	$40,000 a year	Board-approved stakeholders, limited to the first nine.Board seat; can lead working groups.	Yes	Yes	openadr.org

Certification and interoperability

CertificationOpenADR certificationConformance testing and certification for Contributor and Sponsor members; test houses can apply for approved status.

Verified 23 Oct 2026 · re-check by 21 Apr 2027 · Join the OpenADR Alliance · Specification download

Industry alliance · Energy and DER

SunSpec Alliance

Information models, IEEE 2030.5 / CSIP certification and interoperability programs for distributed energy resources.

SunSpec Modbus Modbus IEEE 2030.5

Free: Non-member · paid from $1,000 (Individual)

Yes Free specs
No Free for individuals
No Open working groups
Yes Certify without joining

Membership, programs and sources

Participation

Can anyone read the specifications for free?: Yes"All SunSpec specifications are free to download and use." Most downloads ask for a name, company and email. sunspec.org
Can anyone take part in the community?: PartlyWebinars and specifications are open; working-group participation starts with Individual membership. sunspec.org
Can an individual take part for free?: NoIndividual membership is $1,000 a year. sunspec.org
Can an organization join for free?: NoCompany participation starts with Contributing membership at $5,000 a year. sunspec.org
Are technical working groups open to non-members?: NoThe membership table marks working groups as not included for non-members. sunspec.org
Can non-members take part in interoperability testing?: YesCertification testing runs at Authorized Test Labs, which set their own fees; non-members can certify. sunspec.org
Can a non-member certify a product?: YesNon-members can certify at a $10,000 certification fee; Contributing members pay $5,000. sunspec.org
Does it maintain or host open-source implementations?: PartlyThe SunSpec Modbus model definitions are published on GitHub; the reference implementation needs membership. sunspec.org

Membership tiers

Tier	Published fee	Who can join	Votes	Working groups	Source
Non-member	Free	–Free specifications and certification registry; certification fee $10,000.	Unknown	No	sunspec.org
Individual	$1,000 a year	Academics, individual researchers, hobbyists, open-source developers and other individuals.Personal participation; certification fee $10,000.	Unknown	Yes	sunspec.org
Contributing	$5,000 a year	–Unlimited company participation; certification fee $5,000 plus certification and software discounts.	Unknown	Yes	sunspec.org

Certification and interoperability

CertificationSunSpec IEEE 2030.5 / CSIP certificationCertifies IEEE 2030.5 clients, gateways, aggregators and servers for California Rule 21. Testing at an Authorized Test Lab; SunSpec evaluates the results against CSIP and its test procedures.

Verified 23 Oct 2026 · re-check by 21 Apr 2027 · Membership application · Specifications · IEEE 2030.5 / CSIP certification

User group · Energy and DER

UCA International Users GroupUCAIug

User groups for IEC 61850, CIM and OpenFMB, and the IEC 61850 interoperability (IOP) testing event.

IEC 61850 / MMS

From $1,375 (Corporate, tiers 1 to 8)

Not applicable Free specs
Not published Free for individuals
No Open working groups
Unknown Certify without joining

Membership, programs and sources

Participation

Can anyone read the specifications for free?: Not applicableIEC 61850 and CIM are published by the IEC.
Can anyone take part in the community?: PartlyThe user-group sites (CIMug, 61850ug, OpenFMB) are included with membership; the IOP event invites global stakeholders. ucaiug.org
Can an individual take part for free?: Not publishedIndividual Consultant, University and PUC memberships say "Ask for pricing". ucaiug.org
Can an organization join for free?: NoCorporate membership starts at $1,375 a year. ucaiug.org
Are technical working groups open to non-members?: NoUser groups are a membership benefit; the IEC working-group site needs IEC expert approval. ucaiug.org
Can non-members take part in interoperability testing?: PartlyThe IEC 61850 IOP invites vendors, utilities, test labs, integrators and standards bodies; the page does not say whether membership is required. 61850ug.org
Can a non-member certify a product?: UnknownUCA runs a testing program (ucatesting.org); we have not yet verified its membership rules.
Does it maintain or host open-source implementations?: UnknownWe have not yet verified open-source activity.

Membership tiers

Tier	Published fee	Who can join	Votes	Working groups	Source
Corporate, tiers 1 to 8	$1,375 to $20,000 a year	By annual revenue: tier 1 under $1M is $1,375 (5 accounts), tier 2 $1M to $10M is $2,750, up to tier 8 over $100B at $20,000.Corporate members vote for the Board of Directors.	Yes	Yes	ucaiug.org
Sustaining	$25,000 a year	Unlimited accounts.	Yes	Yes	ucaiug.org
Individual Consultant	On request	One account; apply on letterhead describing your smart grid activities.	Unknown	Yes	ucaiug.org
University	On request	Students, educators and researchers; one account.	Unknown	Yes	ucaiug.org
Public utility commission	On request	Public utility commissions; one account.	Unknown	Yes	ucaiug.org

Certification and interoperability

Interop eventIEC 61850 Interoperability Testing (IOP)Multi-day interoperability event for vendors, utilities, labs, integrators and standards organizations. The 2024 edition ran 12 to 20 September in Birmingham, Alabama.

Verified 23 Oct 2026 · re-check by 21 Apr 2027 · Join UCAIug · 61850 IOP testing

Participation at a glance

"Open" and "free" mean different things at different organizations. Each column is a separate question, and ✓ always means open or free to someone who is not a member. Hover a symbol for the detail; the source is in each organization's details.

Organization	Free specs	Open community	Free for individuals	Free for organizations	Open working groups	Open interop testing	Certify without joining	Open source
ASHRAE	Partly	Partly	No	Not applicable	Unknown	Not applicable	Not applicable	Unknown
BACnet International	Not applicable	Yes	Yes	No	Unknown	Yes	Yes	Unknown
CharIN	Unknown	Unknown	Not applicable	No	No	Unknown	Unknown	Unknown
DNP-UG	No	Partly	Partly	No	Unknown	Unknown	Yes	Unknown
Eclipse Foundation	Not applicable	Unknown	Partly	Partly	Unknown	Not applicable	Not applicable	Yes
IEEE SA	No	Yes	Partly	Unknown	Yes	Not applicable	Not applicable	Not applicable
IEC	No	No	Not applicable	Not applicable	No	Not applicable	Not applicable	Not applicable
ISA	Partly	Yes	Partly	Not applicable	Yes	Not applicable	Unknown	Unknown
LF Energy	Not applicable	Yes	Yes	Partly	Yes	Not applicable	Not applicable	Yes
Modbus Organization	Unknown	Unknown	No	No	Unknown	Unknown	Unknown	Unknown
ODVA	No	Partly	Not applicable	Not published	Unknown	Yes	Partly	Unknown
OPC Foundation	Yes	Partly	Not applicable	Partly	No	Unknown	Partly	Yes
OCA	Yes	Partly	No	Partly	No	Yes	Yes	Unknown
OpenADR Alliance	Yes	No	Not applicable	No	No	Unknown	No	Unknown
SunSpec Alliance	Yes	Partly	No	No	No	Yes	Yes	Partly
UCAIug	Not applicable	Partly	Not published	No	No	Partly	Unknown	Unknown

Yes Yes
Partly Partly
No No
Unknown Unknown
Not published Not published
Not applicable Not applicable

Who writes the standard, and who tests it

For several protocols the body that publishes the standard is not the one that tests or certifies products against it.

IEC 61850

IEC UCAIug

IEC Technical Committee 57 writes the standard, with experts nominated by national committees. UCAIug is the user community: it hosts the 61850 user group and organizes the interoperability (IOP) testing events.

BACnet

ASHRAE BACnet International

ASHRAE publishes the standard through its BACnet Committee, SSPC 135. BACnet International promotes it and runs BTL testing, certification and the PlugFest.

DNP3

IEEE SA DNP-UG

IEEE SA publishes DNP3 as IEEE 1815. The DNP Users Group keeps the member document library and runs conformance testing.

IEEE 2030.5

IEEE SA SunSpec Alliance

IEEE SA publishes IEEE 2030.5. SunSpec Alliance certifies products against CSIP, the profile used with California utilities under Rule 21.

EtherNet/IP

ODVA IEC

ODVA maintains CIP and EtherNet/IP, licenses vendors and runs conformance testing and the PlugFest. IEC SC 65C carries the CIP networks in IEC 61158 and IEC 61784 as Communication Profile Family 2.

How this directory works

Sourced, dated and open to corrections

Every record is one entry in a JSON file in our website repository, checked against a schema on every build. Each answer that states a fact links the official page it came from. We distinguish unknown (we could not establish it),not published (the organization does not publish it) and not applicable.

Fees are checked by hand at the source and flagged for a re-check after 180 days. We never copy prices automatically: membership terms can have contractual weight, and an organization's own page is the only authority.

Spotted an outdated fee, a missing organization or a wrong answer? Open an issue or a pull request with the source, and we review it before it is published.

Edit the data on GitHub Report a correction Download the dataset (JSON)Software implementations map