Soni

What Soni does

SONI Ltd. (System Operator for Northern Ireland) is the licensed electricity Transmission System Operator for Northern Ireland, a private limited company and subsidiary of EirGrid plc that operates independently under a TSO licence regulated by the Utility Regulator. From its Belfast Control Centre at Castlereagh House, SONI performs second-by-second real-time balancing of Northern Ireland's high-voltage electricity grid, dispatching generation and managing demand to ensure secure, reliable supply across all homes, farms, businesses, and public services.

The company's core technology portfolio centres on grid operations and market administration. Operationally, SONI deploys Dynamic Line Rating (DLR) sensors (with Heimdall Power via NIE Networks) that unlock up to 30% more capacity on existing circuits, synchronous condensers to provide low-carbon inertia under the Low Carbon Inertia Services programme, and upgraded wind dispatch tools that reduce renewable energy curtailment. In market operations, the Scheduling and Dispatch Programme (SDP) — jointly developed with EirGrid — enables Energy Storage Power Stations and Wind Dispatch Improvements to participate in the all-island Single Electricity Market. SONI also operates the SEMO joint venture with EirGrid as the Single Electricity Market Operator for the all-island wholesale market, administers capacity auctions (most recently securing 3,862.32 MW for 2029/30), and produces 344+ publications including the Operational Policy Roadmap 2025-2035 and All-Island Resource Adequacy Assessments.

Revenue is generated through two mechanisms: regulated tariffs passed through to consumers via network charges under the Utility Regulator's price control framework (SRP27 submitted February 2026 for the 2027-2032 period covering investment in people, IT, data, and transmission infrastructure), and market participant fees recovered through the SEMO joint venture for operating the all-island wholesale electricity market. Customers span electricity generators, suppliers, and NIE Networks as distribution operator; government bodies including the Department for the Economy and the NI Assembly Committee for the Economy; landowners and communities engaged on infrastructure siting; and emerging segments including data centres and green hydrogen producers. The company's go-to-market is regulatory and stakeholder-led rather than commercial sales, with engagement channelled through public consultations, the Smart Grid Dashboard, and dedicated industry liaison.

Name

Soni

Legal name

SONI Ltd.

Website

https://soni.ltd.uk

Company type

Private

Founded year

2000

Operating status

Operating

Headcount range

101–250 employees

Short description

SONI is the licensed electricity Transmission System Operator for Northern Ireland, operating the high-voltage grid in real time from its Belfast Control Centre and jointly running the all-island Single Electricity Market with EirGrid under regulatory tariffs and market participant fees.

Ownership category

akta.pro rank

Product category

Electricity Transmission System Operation

NAICS

Electric Power Transmission, Control, and Distribution (22112), Electric Bulk Power Transmission and Control (221121)

SIC

Electric Services (4911)

akta.pro primary industry

National & Regional TSOs (ISO/RTO/Grid Operators) (EUADAAAA)

akta.pro secondary industries

Cross-Border Interconnectors & Regional Transmission Coordination (EUADAAAB), Long-Term Transmission Planning (RTO/ISO, Regional & Interregional) (EUADAGAA)

Keywords

• Electricity transmission services
• Grid system operation
• Renewable energy integration
• Wholesale electricity market
• Transmission network planning

Headquarters

HQ city

Belfast County Borough

HQ country

United Kingdom

HQ region

Europe

Offices1 record

Markets served

GTM type

B2B

Offering type

Services

Cost components

Personnel, Infrastructure, Technology or R&D, Operations

Revenue model

1. Transmission System Operation: SONI operates as a regulated monopoly under a Transmission System Operator licence. As the independent TSO for Northern Ireland, the company is funded through regulated tariffs that are passed through to consumers via the electricity network charges. Revenue is determined through price control submissions (SRP27) to the Utility Regulator covering investment in people, IT systems, data capabilities, operational tools, and transmission network infrastructure.
2. Single Electricity Market Operator (SEMO): SONI jointly operates the all-island wholesale electricity market (SEM) with EirGrid through a contractual joint venture. Revenue for market operator services is recovered through market participant fees.

Go-to-market motion1 record

Distribution channels4 records

Marketing channels11 records

Core offering

SONI operates Northern Ireland's high-voltage electricity transmission system on a real-time basis, balancing supply and demand 24/7 from its Belfast Control Centre. It plans the future development of the transmission grid, integrates renewable generation toward the 80%-by-2030 statutory target, and jointly operates the all-island Single Electricity Market (SEM) with EirGrid through the SEMO joint venture. Revenue is earned as a regulated monopoly via transmission tariffs and as market operator via market participant fees.

Product overview

SONI operates as Northern Ireland's electricity Transmission System Operator (TSO), managing the high-voltage grid on a real-time basis from its Belfast Control Centre. The organisation does not generate or sell electricity but balances demand with generation to ensure continuous supply. Its portfolio consists primarily of operational services rather than commercial software products. Key offerings include real-time grid operations through the Control Centre, the Smart Grid Dashboard for public energy data visualisation, the Scheduling and Dispatch Programme (SDP) enabling battery storage and wind dispatch in the Single Electricity Market, the Connections Register for tracking system connections, a Publications Library of 343+ regulatory and planning documents, the Synchronous Condenser Programme for grid stability, and a Public Consultation Portal for stakeholder engagement on infrastructure projects.

Differentiator

Problem solved

Functional benefit

Products and services

• Grid Operations and Real-Time System Management
• Single Electricity Market Operator (SEMO) Service
• Smart Grid Dashboard
• Scheduling and Dispatch Programme (SDP)
• Synchronous Condenser Programme (Low Carbon Inertia Services)
• Public Consultation Portal

Quantifiable outcome

• 30% more capacity on existing circuits through Dynamic Line Rating sensors
• +3 more outcomes

Named customers5 records

Segments4 records

Ideal customer profiles4 records

Technology focussed No

API detail

Has API

No

API docs

API detail

Core technology

AI maturity

App detail

Feature5 records

Partnerships

Eleven partnerships are on record, tiered core and minor.

• StatkraftcoreStrategic or Co-development Partner · 1 June 2026Statkraft awarded Elecnor contracts for the installation of synchronous condensers in Northern Ireland and the Republic of Ireland as part of the Low Carbon Inertia Services programme led by EirGrid and SONI. These projects support grid stability and renewable energy integration targets.
• Heimdall PowercoreTechnology or Integration · 27 March 2026Heimdall Power partnered with NIE Networks to install Dynamic Line Rating (DLR) sensors using drone technology on Northern Ireland's electricity transmission network. The sensors measure temperature, wind and sunlight to determine safe electricity-carrying capacity, potentially unlocking up to 30% more capacity on existing circuits without physical upgrades.
• National Energy System Operator (NESO)coreStrategic or Co-development Partner · 13 March 2026NESO (UK system operator for Great Britain) signed a Memorandum of Understanding with SONI and EirGrid to deepen cooperation and knowledge-sharing on managing grids with high levels of renewables. The agreement includes sharing expertise on accommodating growth of large energy users like ports and data centres, and future modelling and scenario planning to strengthen system resilience. This builds on a partnership framework agreed in 2024.
• EirGridcoreStrategic or Co-development Partner · 13 March 2026SONI and EirGrid jointly operate the Single Electricity Market (SEM) and coordinate all-island electricity transmission. The partnership includes joint TSO-SEMO relationships, Capacity Market Code administration through SEMOpx, and coordinated grid operations. Both organisations signed the NESO MoU together to strengthen cross-border renewable integration cooperation.
• ElecnorcoreImplementation/ SI/ Consulting Partner · 24 February 2026Spanish infrastructure and energy services company awarded contracts by Statkraft for installation of synchronous condensers at Coolkeeragh and Quarry Lane sites. The projects are part of the Low Carbon Inertia Services programme led by EirGrid and SONI, executed under a full EPC model through a consortium comprising Elecnor Servicios y Proyectos, IQA Operations Group, and ESYP.
• NIE NetworkscoreStrategic or Co-development Partner · 20 February 2026SONI works closely with NIE Networks on grid development, planning, and infrastructure projects. The partnership includes joint development of Coolkeeragh Substation expansion in Derry, the North South Interconnector, Mid Antrim upgrade, and a Joint Digitalisation Strategy published in May 2026 for coordinated digital and technology advancement.
• Gas Market Operator Northern Ireland (GMO NI)coreStrategic or Co-development Partner · 19 February 2026SONI and GMO NI (on behalf of Mutual Energy and GNI(UK)) signed a memorandum of understanding to deepen collaboration and align investments across electricity and gas systems. The agreement facilitates holistic energy planning, security of supply safeguarding, and decarbonization opportunities as Northern Ireland transitions toward net zero.
• Mutual EnergycoreStrategic or Co-development Partner · 19 February 2026Gas transmission system operator partner in the MoU with SONI and GMO NI for whole-system energy planning. Mutual Energy owns the Moyle Interconnector connecting Northern Ireland and Scotland, and collaborates on scenario planning for net zero transition.
• GNI (UK)coreStrategic or Co-development Partner · 19 February 2026Gas transmission system operator partner in the MoU with SONI and GMO NI for whole-system energy planning, contributing to integrated electricity and gas infrastructure development for Northern Ireland's energy transition.
• Derry City and Strabane District CouncilminorStrategic or Co-development Partner · 17 February 2026SONI collaborates with Derry City and Strabane District Council on the Coolkeeragh Substation expansion project to support Derry's economic growth and enable more renewable energy connections in the northwest of Northern Ireland.
• InvolveminorStrategic or Co-development PartnerSONI partnered with Involve, the UK's leading public participation charity, to independently facilitate community forums where those affected by grid development plans can be involved at a deeper level than traditional consultation methods. This helps build trust with communities hosting new infrastructure.

Scale indicators6 records

Recent moves6 records

Expansion highlights6 records

Broad incumbents

• TenneT: Major European TSO operating the Netherlands and large parts of Germany. TenneT is a directly comparable TSO peer with significant offshore wind integration experience relevant to SONI's renewable integration challenges.
• Elia Group: Belgian TSO and majority owner of 50Hertz in Germany. Elia is a comparable European TSO with similar regulatory monopoly status and renewable integration experience, operating in a similar small-market context to SONI.
• National Grid ESO: Historically the GB system operator (functions now transferred to NESO). As a broader incumbent in electricity transmission and balancing, it serves as a benchmark for TSO operating models and regulatory frameworks relevant to SONI.
• RTE (Reseau de Transport d'Electricite): French TSO operating the high-voltage transmission grid in France. RTE provides a benchmark for large-scale renewable integration, interconnector management, and market design that are core to SONI's roadmap.

Others

• NIE Networks: Northern Ireland's distribution network operator and asset owner of the transmission system. NIE Networks is SONI's closest operational partner in Northern Ireland, executing the physical grid build-out that SONI plans; not a competitor but a key counterpart.

Direct peers

• Energinet: Danish TSO with extensive wind integration experience. Energinet's transition from fossil to renewable electricity is a benchmark for SONI's 80% renewable target and capability development.
• National Energy System Operator (NESO): The GB system operator, recently established as an independent public corporation. NESO signed a 2026 MoU with SONI and EirGrid to deepen cooperation on renewable integration and large energy user accommodation, making it a directly comparable TSO peer.
• Statnett: Norwegian TSO with similar scale to SONI in a small market. Statnett's experience with hydropower integration, interconnectors, and capacity markets is directly relevant to SONI's renewable-led transition.
• Svenska Kraftnat: Swedish TSO operating the national grid in a small market. Comparable to SONI in scale and in managing a high-renewables, hydro-integrated system with significant interconnection to neighbouring countries.
• EirGrid: Ireland's TSO and SONI's parent company. EirGrid and SONI jointly operate the all-island Single Electricity Market and coordinate grid operations, making them the closest direct peer and operational partner.

Market position

Strengths5 records

Weaknesses5 records

Competitive moat6 records

Key risks6 records

Key highlights7 records

Customer concentration

• Xx.com/soni_ltd
• YouTubeyoutube.com/channel/UCq8ath8cO1EuYnfRfvEhNHA
• Facebookfacebook.com/SONIElectricityNI
• LinkedInlinkedin.com/company/soni-ltd

Revenue estimate

Valuation estimate

Number of profiles

Profiles11 records

Funding overview

Funding rounds

Investors

Funding detail is available on the Subscription and Enterprise plan.Contact sales →

M&A

Investments

M&A and investment is available on the Subscription and Enterprise plan.Contact sales →

Frequently asked questions about Soni