Case Study: Renewable Energy Market Sizing Case Study: Sizing a 5,155 GW Market

A renewable energy market sizing case study is really two questions wearing one coat: how many gigawatts will the grid actually absorb this decade, and how much of that build-out can a single piece of technology reach once China’s two-thirds share, a collapsing cost curve and a solar-dominated mix are priced in. This representative engagement shows how PerspireIP sized the opportunity for a power-electronics company weighing a capacity expansion behind a patented grid-integration platform, building a bottom-up TAM/SAM/SOM from public IRENA, IEA and BloombergNEF data, then cross-checking the demand story against the one dataset a spreadsheet of capacity forecasts always misses — the rate at which the industry is actually patenting.

The Challenge

A power-electronics company came to us ahead of a board decision that turned on a single range: how big is the market its patented grid-integration platform could actually serve by 2030, and is it big enough to justify a nine-figure capacity expansion. The company held a defensible patent family around a utility-scale inverter and storage-coupling architecture and had reference installations running, but its internal model had been built by stacking third-party “renewables to be a \$X trillion market” headlines on top of each other.

Those numbers were not wrong so much as unusable. They conflated the value of generation assets with the value of the balance-of-system electronics the company actually sells, ignored the technology split that decides whether a solar-and-storage product is even in the running, and treated a market that one country already builds most of as if it were open to anyone with a better box. A capacity decision cannot be made on a market figure that answers a different question than the one the business is asking.

The board needed three things the headline numbers could not give them: a total addressable market expressed in the unit the business designs into (gigawatts of new capacity, then the attached power-electronics content), a serviceable market that honestly subtracted the capacity already locked into vertically integrated Chinese supply chains, and some independent signal that the underlying technology demand was real and growing rather than a policy-driven bubble. Get the TAM too high and the expansion is a stranded asset; get the serviceable slice wrong and a technically superior product never finds a project to sit on.

Our Approach

We built the sizing bottom-up, in gigawatts of new capacity, and only converted to dollars at the end — the opposite of the top-down dollar figures the company had started with. The spine of the model was IRENA’s capacity data: global renewable capacity reached 4,457 GW at the end of 2024 after a record 585 GW of additions (a 15.1% rise, and 92.5% of all new power capacity that year), then climbed to 5,155 GW by the end of 2025 — just under half of all installed power capacity on earth. The 2025 additions of 692 GW, up 15.5%, gave us the near-term slope to calibrate against rather than trusting any single forecaster.

From that top-line we segmented three ways. By technology, because the client’s platform attaches to solar and storage, not to every megawatt — and solar is where the growth is, contributing 510 GW of the 692 GW added in 2025 and, on the IEA’s forecast, roughly 80% of all capacity growth to 2030. By geography, because China is set to account for about 60% of the global expansion to 2030, which both enlarges the TAM and shrinks the share a Western supplier can realistically reach. By project type, separating utility-scale plants from the distributed rooftop segment that carries very different electronics content.

Each segment carried its own growth rate and its own source-cited assumption in a log the board could audit line by line. That auditability is the point of a renewable energy market sizing case study: a number the board can trust is one whose every layer can be traced back to a named public source.

Only then did we convert gigawatts to dollars, anchoring to BloombergNEF’s finding that 2024 global energy-transition investment hit a record \$2.1 trillion, of which renewable energy accounted for \$728 billion, and projecting the per-watt equipment cost down across the forecast. A market sizing that holds today’s hardware price flat across a decade overstates revenue in exactly the years that matter most, because the solar-led cost decline is the reason the capacity curve bends upward at all. Finally, we ran the demand story past a patent-filing cross-check, treating the rate of clean-energy innovation as an independent proxy for where real technical and commercial demand is heading.

What the Research Found

The headline TAM survived scrutiny: a market that already carries 5,155 GW of installed capacity, added 692 GW in a single year, and is forecast by the IEA to bring another 5,500 GW online by 2030 — growing 2.7 times over the decade — is unambiguously large, and at \$728 billion of annual renewable investment the equipment layer alone runs into the hundreds of billions before the power-electronics slice is even isolated. But the serviceable market was far smaller than the client’s original model implied, for two reasons the segmentation made unavoidable.

First, geography. The IEA expects China to account for roughly 60% of all renewable capacity added to 2030 — effectively home to every other megawatt installed worldwide — and that capacity is overwhelmingly served by domestic, vertically integrated suppliers. More than half the gross TAM therefore sits behind a supply chain a Western power-electronics firm cannot easily address, which moved the realistically serviceable market to a fraction of the global number.

Second, technology mix. With solar PV driving around 80% of capacity growth, the opportunity concentrates in solar-and-storage balance-of-system electronics rather than across all renewables evenly; wind, growing solidly at 159 GW in 2025, is a different and more consolidated supply base. Netting both effects out left a serviceable market that was still a real, multi-billion-dollar opportunity, but one that had to be won project-by-project in the non-China markets rather than assumed as a share of the global TAM. The discipline here matters: a serviceable-market figure that quietly includes capacity a supplier cannot physically reach is the single most common way a market sizing misleads the people relying on it.

The patent cross-check is where the sizing gained its credibility. The joint EPO/IEA study Patents and the energy transition found that high-value patent families in low-carbon energy grew about 3.3% a year in 2017–19, and that Europe, Japan and the United States still led the field with 28%, 25% and 20% of international patents over 2010–19 — a profile of sustained innovation concentrated in exactly the markets the client already sells into. That supported the growth assumptions rather than contradicting them.

The same data carried a warning: the top 15 applicants alone generated more than a third of all low-carbon energy patent families from 2000 to 2019, so the client would be expanding into a field where a handful of incumbents already hold much of the surrounding art.

The Outcome

The output of this renewable energy market sizing case study was a TAM/SAM/SOM the board could defend to investors line by line, in gigawatts and attached electronics content rather than borrowed trillion-dollar headlines. The gross market was confirmed as large and fast-growing; the serviceable market was reset downward to reflect a China-dominated, solar-led reality; and the obtainable share was framed honestly as a project-win problem in the non-China markets, not a demand problem. The patent cross-check turned the growth assumptions from an assertion into something anchored to an independent, sustained signal — and simultaneously flagged the crowded prior-art landscape as the next diligence item before any capital went out the door.

The practical result was a more conservative, more fundable case: a smaller but real serviceable market, a hardware-cost curve that bent downward with the evidence, and a clear recommendation to pair the capacity decision with a freedom-to-operate review of the dense clean-energy patent thicket. A right-sized market that closes is worth more than an inflated one that frightens the diligence team.

What This Means for Similar Matters

• Size in the unit you sell, not the unit the headlines use. The value of generation assets and the value of balance-of-system electronics are different markets; a grid-tech supplier lives in gigawatts and attached content, so the model has to as well.
• Project the cost curve down. The solar-led hardware cost decline is what bends the capacity curve upward; holding equipment price flat across a forecast quietly inflates every out-year of revenue.
• Subtract geographic concentration before you celebrate the TAM. When one country builds about 60% of new capacity through its own supply chain, the serviceable slice for a Western entrant is a project-win contest, not a share-of-TAM calculation.
• Use patent-filing trends as an independent demand proxy. Sustained low-carbon filing growth corroborated the forecast; the top-15 applicants holding a third of the art flagged the prior-art risk that a pure market model would have missed.

Why Patent-Filing Trends Belong in a Renewable Energy Market Sizing Model

Most market sizing stops at capacity forecasts and cost curves. For a technology business, that leaves out the most forward-looking dataset available: how fast the field is patenting. Filing activity leads commercialisation by years, so a rising patent-family count is early evidence that demand is real and that capital is flowing into the technology. In clean energy the signal is clear — the EPO/IEA study found high-value low-carbon energy patents growing faster than the field had in the previous decade, concentrated in Europe, Japan and the United States.

Reading that curve alongside the gigawatt forecast is how a renewable energy market sizing case study distinguishes a durable opportunity from a subsidy-driven spike, and how it surfaces the prior-art concentration that will shape any later freedom-to-operate work. This is the discipline behind our market sizing and opportunity analysis and our renewable energy technology research.

From Gigawatts to a Defensible TAM, SAM and SOM

The reason this engagement started in gigawatts rather than dollars is that the sequence determines whether the final number can survive diligence. A top-down model starts with a huge dollar figure and shaves it with assumption after assumption until it reaches something the board likes; by the end, no one can trace which assumption did the work. A bottom-up model does the opposite. It begins with a physical quantity the industry actually reports — gigawatts installed and added — and builds upward, attaching one cited source and one growth rate to each segment so every layer is auditable.

The total addressable market was the full new-capacity build the IRENA and IEA data describe: 692 GW added in 2025 on the way to roughly 940 GW a year by 2030, converted to dollars with a declining equipment-cost series rather than a frozen one. The serviceable available market stripped that down to the solar-and-storage segment the client’s platform competes in, outside the China supply chain that serves most of the global build.

The serviceable obtainable market — the number the capacity decision actually rested on — was then modelled as a realistic set of project wins over the forecast period, not a flat percentage of the TAM. Framed that way, the smaller SOM was not a disappointment; it was the first version of the number a sophisticated investor would believe.

That is the through-line of every market sizing we deliver: anchor to a physical unit, segment honestly, project the cost curve with the evidence, and cross-check demand against the independent signal of patent filings. The output is not the biggest number available — it is the one that still stands up after the expansion is funded and the diligence team starts pulling it apart.

Data Sources

The market and patent data referenced above comes from:

• IRENA — Renewable capacity: near-700 GW surge in 2025 — Renewable capacity reached 5,155 GW at the end of 2025 (49.5% of the 10.4 TW global total); 692 GW added in 2025, up 15.5%, with solar at a record 510 GW and wind at 159 GW.
• IRENA — Renewable Capacity Statistics 2025 — Total renewable capacity reached 4,457 GW at the end of 2024 after 585 GW of additions (+15.1%), a record 92.5% of all new power capacity; solar added 452 GW, wind 113 GW.
• IEA — Renewables 2024 (Executive summary) — Main case sees 5,500 GW of new renewable capacity operational by 2030 (capacity growing 2.7x), with solar PV around 80% of the growth and China about 60% of the global expansion; renewables near half of global electricity by 2030.
• BloombergNEF — Energy Transition Investment Trends 2025 — Global energy-transition investment reached a record $2.1 trillion in 2024 (+11%); renewable energy accounted for $728 billion, with China responsible for two-thirds of the global increase.
• EPO & IEA — Patents and the energy transition — High-value low-carbon energy patents grew about 3.3%/yr in 2017–19; Europe (28%), Japan (25%) and the US (20%) led international patenting over 2010–19; the top 15 applicants generated more than a third of all families from 2000 to 2019.

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