Chile: one of the world's most interesting BESS markets

Chile has about 37 GW of installed capacity and roughly 80 TWh of annual demand; the whole system consumes less electricity than the state of New York. But it is disproportionately important to the global battery industry for three overlapping reasons. First, the Atacama Desert has the highest measured solar irradiance on Earth (global horizontal irradiance regularly above 2,500 kWh/m²/year at Crucero and María Elena), which means Chile is the cleanest live laboratory anywhere for what happens to a grid when solar becomes structurally cheaper than every alternative during daylight hours. Second, the Salar de Atacama sits inside Chile's borders and holds, together with the Salar del Hombre Muerto and the Salar de Uyuni across the Lithium Triangle, over half of the world's known lithium resources. Third, Chile's power system has spent the past five years living through the exact sequence (solar overbuild, curtailment, negative prices, storage response, transmission upgrade) that Germany, Texas and Australia are also navigating. Chile is running the experiment first, at a scale small enough to be legible.

For a battery professional, the practical upshot is that Chile compresses years of grid-storage evolution into a market you can read end-to-end in a weekend. The lessons transfer.

Between 2014 and 2025 Chile's installed solar PV capacity grew from about 0.4 GW to roughly 11 GW, driven initially by the 2013 Non-Conventional Renewable Energy Law (Ley 20.698, the '20/25' target) and later by structural cost declines that made PV the cheapest new-build resource in the country by a wide margin. Almost all of that capacity landed in the northern regions of Antofagasta, Atacama and Tarapacá — close to the mining load but far from the population centres of the Metropolitan Region and the south.

The consequence was predictable and, for a period, brutal. In 2023 and 2024 the national grid operator, the Coordinador Eléctrico Nacional, reported solar curtailment rates that on many days exceeded 50% during peak midday hours, with entire plants dispatched to zero for extended windows. Spot prices in the northern SEN nodes routinely collapsed to zero or negative between 10:00 and 16:00. PPAs signed in the 2016-2017 auction rounds — some as low as USD 21.5/MWh — became loss-making because the merchant hours could not be sold. It is against this backdrop, not on the strength of a subsidy programme, that BESS in Chile became an economic proposition rather than a policy one.

Ley 21.505, promulgated in November 2022, is often described as 'the law that unlocked storage in Chile'. That is broadly right but worth being precise about. The law did three concrete things. It formally recognised standalone storage as a distinct market participant (previously storage could only participate coupled to generation). It gave standalone BESS access to the capacity payment (potencia de suficiencia) that recognises firm capacity contribution to the system. And it opened electromobility infrastructure to a lighter regulatory regime.

What the law did not do was create a subsidy, a feed-in tariff, or a capacity market of the kind that exists in PJM or the UK. Chile's BESS market is fundamentally merchant with a capacity overlay. That distinction matters when comparing project economics to ERCOT, the UK T-1 auctions, or Italy's MACSE — Chile sits closer to the ERCOT model, with the capacity payment providing a stabilising floor rather than the primary revenue stream. The 2023 and 2024 CNE-run supply auctions were the first to explicitly qualify BESS as an eligible technology to meet contracted energy blocks, which combined with the capacity mechanism created the first bankable pathway for pure-play storage IPPs in the country.

It is tempting to assume that because Chile sits on the world's largest lithium reserves, the country is or will soon be a battery-manufacturing hub. That assumption should be resisted. Chile's lithium industry, dominated by SQM and Albemarle operating under long-term CORFO concessions in the Salar de Atacama, exports almost exclusively as lithium carbonate and hydroxide, and the vast majority of that volume travels to cathode-material and cell producers in China, Korea and Japan. There is no operating gigafactory in Chile. The two commercial-scale cathode plants announced in 2023 under the preferential lithium-price scheme (BYD and Tsingshan) were both cancelled by 2025, and the domestic cathode-precursor and cell-manufacturing thesis remains, for now, aspirational rather than industrial.

The April 2023 National Lithium Strategy, announced by President Boric and formally structured through 2024 partnerships between Codelco and SQM (Salar de Atacama) and between Codelco and other private partners (Salar de Maricunga), moves lithium extraction toward a public-private majority-state model and mandates the use of direct lithium extraction technology in new operations. It does not, by itself, create downstream battery manufacturing. For BESS project developers, the practical implication is that Chile-sourced lithium reaches a Chilean project only after a round trip through Chinese cathode plants and, typically, Chinese cell assembly. This is not unique to Chile — Australia, Argentina and Bolivia face the same structure — but it is worth stating clearly, because the 'lithium country' framing often crowds out the more interesting story, which is Chile's grid.

A Chilean utility-scale BESS project (100-300 MW with 4-5 hours of duration; the pipeline is shifting toward 5-hour systems because full capacity-payment recognition starts at 5 hours) typically layers four revenue streams. First, energy arbitrage: charging at zero or negative prices during the Atacama solar peak and discharging into the evening ramp (18:00-22:00), when hydro and gas set marginal prices and spot values regularly exceed USD 80-120/MWh. Second, contracted energy: BESS-backed PPAs from the 2023 and 2024 auction rounds; the April 2024 tender averaged USD 56.6/MWh, with an explicit bid rebate for night-time injection backed by storage. Third, potencia de suficiencia: the capacity payment for firm capacity contribution, recognised on a duration-based sliding scale of roughly 100% of nameplate at 5 hours and above, around 90% at 4 hours, falling to 50% at 1 hour. Fourth, ancillary services: primary and secondary frequency control, and increasingly voltage support, procured by the Coordinador on a cost-based or, for new services, competitive basis.

The rough current-market split for a merchant-plus-capacity project in the Antofagasta node is roughly 55-65% energy arbitrage, 20-30% capacity, 5-10% ancillary services, and the balance from curtailment-avoidance value when coupled with solar. That mix will shift as the pipeline builds out — arbitrage margins compress as more storage crowds into the same midday-to-evening spread, which is why the 2024-2025 wave of projects has increasingly been contracted rather than pure-merchant.

Three variables will decide how large Chile's storage market becomes. First, transmission: the Kimal-Lo Aguirre HVDC line (1,346 km, 3,000 MW, ±600 kV) broke ground in February 2026 with commissioning targeted around 2030, and will carry Atacama solar to the load centre in Santiago, structurally reducing northern curtailment. Storage economics north of the line get worse if it is built on time and better if it slips. Second, mining electrification: BHP, Codelco, Antofagasta Minerals and Anglo American are progressively electrifying haul-truck fleets and processing loads, which reshapes both the demand profile (24/7, high load-factor) and the private-PPA market. Third, hydrogen: green hydrogen was the headline of the 2020-2022 period and is now recalibrating; the realistic near-term projects (Haru Oni, H2 Magallanes, HNH Energy) are export-oriented, run on Magallanes wind rather than Atacama solar, and will not primarily be built around BESS.

A reasonable base case: Chile ends the decade with 10-14 GW of installed BESS (the grid operator already projects around 8.5 GW operating by the end of 2026), a live capacity-payment market that has been tested through at least one supply-adequacy stress event, and a lithium industry that has partially, but only partially, moved up the value chain toward cathode precursor. For anyone building a career in batteries, storage or renewables in Latin America, Chile is the market to understand first.