Slip rings, shoe factories, and a Grantham side street
Dysart Road, on the southern edge of Grantham, is the kind of street that registers as industrial background rather than destination. Units, yards, a quiet stretch of Lincolnshire pragmatism. Number 357 is a former shoe factory — the brickwork and the bones of it still visible — now home to BGB Innovation, a company most people in the town have probably never heard of, making a component that most people anywhere in the world have probably never thought about.
That component is the slip ring. In simple terms, it is the device that allows electrical power and data signals to cross a rotating joint without tangling the cables. Think of the problem: a wind turbine hub spins continuously, but it still needs to send and receive electrical signals between the rotating blades and the fixed structure beneath. The slip ring is what makes that possible — a precision-engineered ring of conductive material and contact brushes that keeps current flowing regardless of how many times the assembly rotates. Without it, a turbine cannot manage its own blade pitch, transmit sensor data, or protect itself from lightning strikes.
BGB has been making these components at this address since its founding in 1976, starting out as a carbon brush holder manufacturer, moving into slip rings during the 1980s, and eventually becoming — by its own account, and with OEM approvals to support it — the world's leading supplier to the wind turbine industry. Around 100 to 125 people work across two Grantham sites. Annual turnover runs to roughly £25 million. Products sit inside turbines across 77 countries.
The tension is worth sitting with for a moment: a component most engineers outside the sector couldn't name, built on a Lincolnshire side street in a building that used to make shoes, powering a significant share of the world's wind energy infrastructure.
Betting on wind turbines before wind was a policy priority
In 1991, UK energy policy was still organised around coal and nuclear. The privatisation of the electricity industry had just completed, the coal industry was months away from crisis, and wind power contributed a fraction of a percent to the national grid. The government's first renewables obligation — the Non-Fossil Fuel Obligation — had been introduced in 1990, but wind was barely a rounding error in the national energy mix. It was in this context that BGB became the first UK manufacturer to supply slip ring assemblies to the wind turbine industry, and the first to design a dedicated slip ring for hub control systems in a wind turbine.
The move was not a strategic leap so much as a careful technical extension. The company had spent the previous decade building expertise in electrical slip rings after starting life as a carbon brush holder maker — components that are closely related in both design and manufacturing logic. When wind turbine manufacturers needed a rotary solution that could handle the specific demands of a spinning hub — continuous rotation, harsh weather, blade pitch control signals — BGB already had the underlying capability. Adapting it for wind was an incremental step, not a reinvention.
What that timing created, though, was compounding advantage. By the time wind energy became a serious policy priority in the 2000s, and a major infrastructure programme in the 2010s, BGB had accumulated roughly two decades of application-specific knowledge: how these components fail in real turbines, how to extend their service life, what OEM qualification processes require. That kind of know-how accrues slowly and cannot be replicated quickly by a competitor arriving once the subsidies are in place. The company's current position as an approved manufacturer for Vestas, GE, Siemens Gamesa, Goldwind, Suzlon, and Nordex was built on a foundation laid when wind turbines were still a curiosity on a handful of exposed hillsides.
What it looks like to supply Vestas and Siemens Gamesa from Lincolnshire
Being listed as an approved manufacturer for Vestas, GE, Siemens Gamesa, Goldwind, Suzlon, and Nordex is not a marketing claim that admits easy inflation. These are the six largest wind turbine OEMs in the world, and approval processes for their supply chains involve intensive audits of quality systems, manufacturing tolerances, and field performance data. A supplier that passes once and then stumbles will lose the approval. BGB holds all six.
The downstream numbers follow from that. An estimated 500,000 rotary solutions are now installed in offshore and onshore turbines across 77 countries — a figure BGB publishes on its own energy applications page. More than 90 per cent of the company's turnover is exported, a rate sustained consistently year after year rather than achieved in a single exceptional period. That consistency earned it the Queen's Award for Enterprise in the International Trade category, which is awarded on evidence of sustained performance, not ambition.
The structural oddity worth registering is the mismatch between those numbers and the organisation producing them. A privately held family firm — third generation, modest headcount — holds approvals from tier-one multinationals that could, in principle, source equivalent components from manufacturers with far greater production capacity. That they have not done so suggests that whatever qualification BGB brings to those relationships — accumulated application knowledge, proven failure rates, audit-ready quality systems — is not easily replicated, regardless of factory size.
Choosing to stay and reinvest in Grantham
Part of the answer lies in ownership. BGB is a third-generation, privately held family business — no external shareholders, no private equity timeline, no group strategy mandating that production consolidate in a lower-cost location. That structure does not guarantee local reinvestment, but it does remove the most common institutional pressure against it.
What the family has done instead is commit capital repeatedly to the Grantham sites. A 468m² extension to the Dysart Road factory, a dedicated R&D laboratory, robotic production cells, and solar panels are among the investments the company has made in its manufacturing base. East Midlands Development Agency grant funding supported some of this — a £113,000 award is confirmed in BGB's own published materials — which points to the regional public-funding ecosystem playing a practical role alongside private reinvestment, not merely as decoration.
Those choices came into focus around the company's 50th anniversary, when BGB chose to deepen its Grantham footprint rather than reconsider where production should sit. Writing in The Manufacturer in June 2025, Production Manager Nathan Flower described BGB's updated factory as evidence that a sustainable manufacturing base and a genuine skills pipeline can reinforce each other — a claim that makes most sense when the firm in question has somewhere specific it intends to stay.
What a factory floor teaches that a classroom cannot
Six students from West Grantham Church of England Secondary Academy are currently working through a 12–18 month programme at BGB's Dysart Road site. The curriculum is specific: manual turning, milling, slip ring assembly, and CAD. This is not a single factory visit or a careers-fair handshake. It is a structured training sequence, delivered alongside the firm's production team, on the actual components that end up inside operating wind turbines.
That specificity matters. The students are not learning transferable manufacturing abstractions — they are assembling the rotary systems that control blade pitch in turbines generating electricity on the UK grid. The gap between a secondary school classroom and that application is not bridged by a poster about engineering careers. It requires someone to show, in practical sequence, how raw materials become precision components inside a live production environment.
Flower's argument in The Manufacturer, from June 2025, extends this point beyond job-filling. The case he makes is that hands-on factory training — apprenticeships grounded in a real production context — is also how the energy transition builds its workforce. The skills shortage and the net-zero workforce gap are not separate problems; they are the same problem at different scales.
Six students does not solve either. But a genuine 12-to-18-month curriculum, delivered by a firm that supplies Vestas and Siemens Gamesa from a Grantham side street, is a replicable model rather than a one-off gesture. The question it raises is straightforward: what would it take — from the school, from BGB, from the wider South Kesteven skills ecosystem — to run that programme at ten times the scale?
What BGB's model suggests about place, specialism, and the energy transition
BGB's story is not a template. It is the outcome of a specific set of decisions — entering a technology niche in 1991 before it became commercially obvious, staying privately held across three generations, reinvesting in Grantham rather than optimising for cost — compounded over five decades. The conditions that made that possible are not simply reproducible.
What it does demonstrate is narrower and more useful: that the energy transition is not only a question of finance, policy, and software. It runs on physical components — slip rings, fibre optic joints, lightning protection assemblies — and those components can be precision-manufactured in a former shoe factory on the edge of a Lincolnshire market town, provided the knowledge base, the certifications, and the production discipline are genuinely there.
Provincial location has not been a constraint for BGB because deep specialism replaced proximity. Reputation with Vestas and Siemens Gamesa travels further than geography.
For readers in Grantham and South Kesteven, the honest question is whether BGB is indicative or exceptional. One firm with a fifty-year head start in a technical niche is not, on its own, evidence of a local industrial cluster. What it might be is proof that the depth is achievable — if the starting point, and the patience, are both present.