Who Are the Core Customers of National Grid Company?

National Grid's core customers are the population and businesses it serves via transmission and distribution-about 60 million people in England and Wales plus over 8 million distribution customers after the Western Power Distribution acquisition, and roughly 7 million electricity and gas customers across New York and Massachusetts in the US.

Secondary customers include residential customers National Grid serves that export power (prosumers), commercial customers National Grid and industrial customers National Grid that need firm connections, plus large renewable developers building offshore wind and utility-scale solar requiring high-capacity interconnections.

National Grid serves a mixed base: residential customers National Grid, small business gas customers, large business electricity customers and municipal/institutional accounts; transmission roles make it a wholesale counterparty to generators and suppliers as well as a retail network operator.

By 2026 National Grid is prioritizing grid capacity for offshore wind (UK target 50 GW by 2030 pathways) and New York's Climate Leadership mandates, making large-scale renewable developers and transmission customers the fastest-growing, high-value segment in the firm's customer mix. Read more in Product Growth of National Grid Company

National Grid core customers cluster where renewable generation and population density meet. In the UK, the East Coast and North Sea corridors host large offshore wind clusters tied into The Great Grid Upgrade; in the US, Boston and New York City concentrate residential customers National Grid and large business electricity customers needing capacity and resilience.

Demand is meaningful across Massachusetts and New York clean energy zones, mid – size cities in the UK (east – midlands) and industrial corridors where industrial customers National Grid and commercial customers National Grid require firm supply and interconnection for electrification projects.

National Grid's strengths are high – voltage transmission for offshore wind in the UK and dense urban distribution in the US. Revenue mix and capital plans prioritize these segments; the US capital investment plan exceeds 4 billion USD annually as of 2026, focused on grid hardening in high – demand urban centers.

Fastest growth is in electrification of transport and buildings and in gas – pipe replacement programs. State mandates in Massachusetts and New York push retirement of leak – prone gas pipes toward geothermal and reinforced electric distribution, expanding National Grid customer segments US vs UK and increasing demand from both residential customers National Grid and National Grid large business electricity customers.

National Grid grows customers by moving beyond wires to projects such as National Grid Ventures, which delivers 7.8GW of subsea interconnector capacity linking the UK and Europe, and by divesting non-core UK gas transmission to target an 80% electricity-weighted asset mix by 2026. This attracts ESG-minded institutional investors and new commercial and large business electricity customers while opening routes to supply and developer partners.

National Grid keeps residential customers National Grid and small business gas customers engaged by linking growth to regulated returns: RAB-led investments and favorable RIIO-T3 settlements in 2025/2026 reward grid flexibility and fund upgrades while protecting core service levels and tariffs for commercial customers National Grid and industrial customers National Grid.

Repeat demand comes from network lock-in: transmission and distribution contracts, priority customers eligible for outage support, and long-term connections for industrial plants and factories create sticky relationships. National Grid's reliability target of 99.9% uptime sustains trust across core customer segments served by National Grid.

The main growth lever is regulated asset base expansion: disciplined RAB increases tied to RIIO-T3 outcomes and investments in flexibility technologies drive returns and customer-facing capacity. This approach converts strategic moves-like the electricity reweighting and Ventures interconnectors-into concrete gains for National Grid key account customers and local governments and municipalities.