#947 1776 · Boulton & Watt · Steam power / industrial machinery
Boulton & Watt didn't sell the steam engine — they sold a cut of the coal it saved
the problem
Mine owners couldn't justify the cash to buy an unproven, expensive engine no matter how efficient it was
background
James Watt's separate-condenser engine used roughly a quarter of the coal a Newcomen engine burned to do the same pumping work, but Cornish tin and copper mine owners were cash-poor and had no reason to trust a stranger's claims about an engine they had never seen run on their own site. A large upfront price for unproven machinery was a hard sell, and Watt's business partner Matthew Boulton needed a way to get engines installed without asking owners to bet real money on a promise.
Selling or leasing the engine at a fixed price also gave Boulton & Watt no way to capture the value of the fuel efficiency itself — a mine burning cheap coal had little reason to pay much for it, while a mine paying dearly for hauled-in coal had every reason to pay a lot, and a flat price could capture neither.
what everyone would do
Cut the price, offer credit, or wait for reputation to build slowly engine by engine — the standard moves for selling an expensive, unproven capital good to buyers without spare cash.
what they saw
Boulton saw the engine was the wrong thing to price. The coal it saved varied by mine and was easy to benchmark against the Newcomen engines everywhere — pricing the saving, not the machine, removed the buyer's risk.
the move
Boulton & Watt installed the engine for close to the cost of manufacture and installation, then charged an ongoing royalty equal to one-third of the value of the coal the engine saved compared with the Newcomen engine it replaced, calculated against a published benchmark for Newcomen fuel consumption. Each licensed engine carried a mechanical counter that recorded every stroke of the piston, and a Boulton & Watt agent visited periodically to read the counter and bill the royalty, valid for the life of Watt's 1769 patent, extended by Parliament to 1800.
why it works
The royalty aligned what the mine owner paid with what the mine owner gained, so the sales pitch changed from 'trust our claims' to 'pay only if this actually saves you money' — a promise a cash-poor buyer could accept without capital. The mechanical counter made the saving legible and billable without either side having to trust the other's word, and because the fee was a fraction of a real, ongoing saving rather than a one-time price, Boulton & Watt's revenue compounded across every stroke the engine ran for the full 25-year patent term.
the payoff
Cash-poor mines adopted the engine risk-free; Boulton & Watt billed royalties for 25 years, becoming one of Britain's most profitable firms.
where it breaks
The model needs a defensible, unowned benchmark to measure the saving against — Boulton & Watt had the ubiquitous Newcomen engine as a public yardstick, which a genuinely novel product without an incumbent to compare against would lack. It also depends on a legal monopoly or exclusivity long enough to collect the royalty before rivals build the same machine outside the metered relationship entirely, which is exactly what happened once the patent expired in 1800.
what came after
The counter-metered, savings-linked royalty is now credited as the first energy performance contract; the same shared-savings structure reappeared two centuries later as the business model of the modern energy service company (ESCO) industry.
references
- [1]What is Energy Performance Contracting?Energy Services Coalition, 2023energyservicescoalition.org
- [2]Boulton and Watt Steam Enginesthemeister.co.uk (Hindley engineering history archive), 2015themeister.co.uk