Wait—aren't solar panels and batteries in oversupply right now?
Yes, and that has flipped the old narrative on its head. A 2025 meta-analysis of 12 major energy scenarios found that global solar PV panel and lithium-ion battery production currently exceeds demand, which is pushing costs down [1]. This is good news for buyers, but it creates a new set of risks: trade conflicts and even tighter supply-chain concentration. The same study notes that the pressure point in the energy system has shifted from generation (making enough power) to flexibility (storing and moving it), meaning the bottleneck is no longer panels or batteries themselves, but the grids and storage infrastructure needed to use them [1].
The oversupply is real, but it is fragile. Since 2020, nearly 200 trade-restrictive measures have been implemented globally, many targeting clean energy components [2]. So while you can buy cheap solar panels today, that could change quickly if geopolitical tensions disrupt the highly concentrated manufacturing hubs.
If panels are cheap, what is actually limiting the buildout?
The real limits are raw materials and grid infrastructure—and these are being underestimated in many projections. A 2025 review in IEEE Energy Sustainability Magazine argues that most 2050 scenarios underestimate the role of networks (transmission lines, transformers) in keeping the system stable [3]. The same paper raises a blunt practical question: 'which clean sources will produce the needed electricity in winter, where solar and wind production are low and daily battery storage does not suffice?' [3]. This points to a need for seasonal storage (like hydrogen or pumped hydro) that current battery supply chains are not designed to meet.
On the materials side, the IEA's 2022 special report on solar PV supply chains—the most comprehensive of these studies, with 94 citations—details vulnerabilities at every stage from polysilicon to finished modules [4]. It warns that diversification is the key strategy for reducing risk, but developing new supply chains requires massive investment in mining, processing, and manufacturing. The 2025 meta-analysis adds that Poland alone will need $5–6 billion annually just for transmission networks [1]. So the bottleneck is not just making panels; it is digging up the lithium, copper, and rare earths, building the factories, and stringing the high-voltage lines to connect everything.
So are we on track for net-zero, or are these limits going to derail it?
The picture is mixed, but the evidence suggests the timeline is tighter than many assume. On the positive side, the 'net-zero premium'—the extra cost of a clean energy system versus business-as-usual—has actually shrunk from 19% to 15% according to the 2025 meta-analysis, meaning the transition is getting cheaper overall [1]. But that same study also found that electricity demand has jumped by over 2,200 terawatt-hours by 2035 (driven by AI data centers, heatwaves, and electric vehicles), which puts enormous pressure on supply chains that are already concentrated and vulnerable [1].
The 2026 review of global energy development reinforces this: it notes that the Strait of Hormuz alone transports 20% of the world's oil and LNG, and that geopolitical instability there could cascade into clean energy supply chains because the same shipping routes and trade policies affect raw materials [2]. The bottom line: the supply-chain limits are real, they are being underestimated in many optimistic scenarios, but they are not insurmountable—if governments and industry invest now in diversification, grid upgrades, and material recycling. The IEA report explicitly recommends policy support for domestic manufacturing as a way to reduce risk [4].
About These Sources
This answer is built on 4 peer-reviewed studies — published from 2022 to 2026, 3 from 2024 or later, collectively cited 96 times — selected as the most relevant from 4 studies that passed quality screening, drawn from 48 papers retrieved from a database of over 500 million.
Sources used in this answer
Energy Transition 2024–2025: New Demand Vectors, Technology Oversupply, and Shrinking Net-Zero 2050 Premium
A 2025 meta-analysis of 12 energy scenarios found solar PV and battery oversupply is lowering costs but increasing trade conflict risks; electricity demand has risen by over 2,200 TWh by 2035, and the net-zero premium has fallen from 19% to 15%.
Energy Development of the World: A Review
A 2026 review highlights that clean energy supply chains (solar PV, lithium-ion batteries) are over-concentrated and vulnerable to geopolitical risks, with nearly 200 trade-restrictive measures imposed since 2020.
The Energy Transition’s Hidden Iceberg: Practical Barriers and Proposed Solutions Toward Sustainable Electricity Systems
A 2025 IEEE article argues that many 2050 projections underestimate the role of grid networks and seasonal storage, and raises the critical question of how to supply electricity in winter when solar and wind are low.
Special Report on Solar PV Global Supply Chains
The IEA's 2022 special report (94 citations) examines solar PV supply chains from raw materials to finished modules, identifying key vulnerabilities at each stage and recommending diversification and policy support for domestic manufacturing.