Common ground for connected energy.

Vendor-neutral interoperability certification for grid-ready energy devices.

Mercury certifies how a smart-energy device performs for the grid. Certify once, and the device behaves the same way with every Mercury-aligned utility and platform.

The Interoperability Challenge

There is no single standard. Dozens of global protocols exist, and which ones apply changes from country to country. So manufacturers and utilities fill the gaps with custom work, one connection at a time. And even where a shared standard is used, it leaves so much room for interpretation that no two devices end up speaking it the same way. A device proven with one utility starts again with the next.


Manufacturers lose engineering time to integration and rework instead of product. Retailers launch flexibility tariffs most of their customers' devices cannot join. Network operators reinforce substations that a controllable device fleet could have spared. Mercury solves this with a certification the device earns once, ensuring interoperability with every Mercury-aligned utility and platform.

Solar panels installed on a dark tiled roof of a house under clear blue sky.

What Mercury does

Certify once, not per partner

One certification replaces the integration cycle you now repeat per partner. A certified device's grid behaviour - how fast it responds, what it reports, how it handles issues - is proven to a class and holds with every Mercury-aligned counterpart.

Built on the protocols you already run

Mercury is a certification layer on top of OCPP, OpenADR, and other established industry recognised protocols. Nothing is replaced, and existing protocol work carries forward. Mercury closes the gap between a loosely specified protocol and an integration you can certify.

Vendor-neutral, nonprofit, cross-sectional

Mercury is a nonprofit backed by EPRI. A cross-sectional Board, working groups steered by members, and a technical roadmap ensure neutrality and allow competing companies to shape the future of interoperability together.

Who Mercury is for

Device Manufacturers

Certify once, and each new market opens without a new engineering project.

Transmission System Operators

A larger, certified pool of fast-responding assets you can reference in prequalification instead of assuring device by device.

Distribution System Operators

Defer or avoid reinforcement by managing a local constraint with a certified, controllable device estate.

Energy Retailers

Launch flexibility tariffs that work across many device brands, not one integrated OEM.

Regulators and Industry Associations

Engage as an observer without endorsing, or recommend a vendor-neutral standard to your members.

Technology Providers

Certify your platform once and answer the standards question for every customer.

Flexibility Providers

Onboard any certified device the same way and grow coverage faster, with behaviour you can design programmes around.

Frequently Asked Questions

What is Mercury?

Mercury is a vendor-neutral, nonprofit certification of grid-readiness for smart-energy devices, including EV chargers, home batteries, heat pumps, and solar inverters. It certifies how a device performs for the grid, to a defined class, and a certified device behaves the same way with any Mercury-aligned utility or platform.

Is Mercury a protocol?

No. Mercury is a certification layer that sits on top of protocols such as OCPP and OpenADR. The protocol defines the language; Mercury certifies the behaviour the protocol leaves open.

Do we have to join Mercury to certify a device?

No. Certification is the technical work that earns your device the Mercury Mark; membership funds the working groups and carries voting and roadmap influence. Certify without joining if you only need the Mark; join if you want to shape the standard.

What are the performance classes?

There are three performance classes, plus a bridge. Each one sets the level of grid service a device is certified for, based mainly on how fast it reacts and how accurately it reports. Class A is the most demanding, Class C the most accessible, with Class B in between.

A first call is short and practical:

where you sit between devices, platforms, and utilities, and whether membership, certification, or observer engagement is the right first step.

Get in touch

Considering Mercury membership? Let’s talk.