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Weekly Research · W42 · APAC

Long-term contracts still anchor battery finance; price spikes are a bonus

NSW prices hit A$23,107/MWh this week, but what actually moved projects forward was contracts: Summerfield entered commissioning with a 10-year Origin offtake, NSW designed LTESA contracts for a 1.5 GW firming tender, the Philippine regulator approved a 5-year battery reserve contract, and Japan's Nozu project locked in equipment supply on the back of its LTDA contract.

Period 2026/10/12 – 10/18Published 2026/10/19 (Mon)Markets Australia · Japan · Philippines · South Korea · Singapore · TaiwanData checked 2026/10/27
Key judgements

Four conclusions

  1. NSW: spike revenue is real, but it can't service debt.On the afternoon of 10/12 a heatwave lifted demand by nearly 2,000 MW within an hour while about 2,400 MW of coal was unavailable, and the spot price briefly reached A$23,107/MWh. Revenue like this is hard to forecast, and lenders usually exclude it from debt-service cash flow.1
  2. Australia: large batteries keep reaching construction on long-term contracts.Summerfield (240 MW/960 MWh) entered commissioning with a 10-year Origin Energy offtake; the Lower Wonga solar-plus-storage project (281 MW/843 MWh battery) has both CIS support and a Rio Tinto hybrid offtake.3
  3. NSW: an 8-hour threshold changes the competitive field.ASL is consulting on a 1,500 MW firming tender requiring at least 8 hours of sustained output under LTESA contracts. Two- to four-hour batteries are disadvantaged in such tenders; gas and long-duration storage are more competitive.4
  4. Philippines and Japan: regulated contracts make revenue predictable.The ERC provisionally approved a 5-year battery reserve contract at PHP 5.28/kWh; Japan's Nozu project locked in Trina Storage supply after its 20-year LTDA contract and Aozora non-recourse financing.2,6
Key numbers

Six numbers this week

NSW spot price peak (10/12)A$23,107/MWh11 five-minute intervals above A$5,000
Summerfield battery240 MW / 960 MWh10-year Origin offtake · commissioning
NSW ASL firming tender1,500 MWSustained output ≥ 8 hours · LTESA
Philippines Visayas battery reserve contractPHP 5.28/kWh5 years · reserve spot average about PHP 21
AGL Abermain battery (Queensland)500 MWhReferred for federal EPBC approval
Japan Nozu project50 MW / 196 MWhCompletion Q3 2028
Timeline

What happened

DateMarketEventWhy it matters for finance
10/12AUNSW spot price peaked at A$23,107/MWh; about 2,400 MW of coal unavailable, technical curtailment peaked at 2,800 MW; about 30,000 home batteries earned A$2m in two hours.1Spike revenue exists but is unpredictable and should not count toward debt capacity.
10/12PHERC announced its 10/9 provisional approval: NGCP–EAUC 44.72 MW battery reserve contract, 5 years, PHP 5.28/kWh.2The first regulator-approved example of capacity-style battery revenue.
10/14JPTrina Storage will supply Elementa 2 Pro systems to the 50 MW/196 MWh Nozu project.6Equipment and completion risk for an LTDA project is further settled.
10/15AUASL consults on a 1,500 MW NSW firming tender (10/13–11/4) requiring ≥ 8 hours under LTESA contracts; the tender is expected to open in early 2027.4Longer-duration requirements will shape battery sizing and bidding strategy.
10/15AUSummerfield 240 MW/960 MWh entered commissioning (10-year Origin offtake); Gotion supplies Lower Wonga (281 MW/843 MWh).3Long-term offtake remains the mainstream structure for financing large batteries.
10/16AUVictoria declared Hazelwood BESS Line Co a transmission system operator, letting ENGIE's 150 MW/300 MWh expansion reuse on-site transmission assets.5Grid access at retired coal sites is becoming a scarce asset.
10/16AUAGL referred its 500 MWh Abermain battery in Queensland for federal EPBC environmental approval.7Large retailers keep expanding their own battery fleets.
Australia

Contracts land, spikes are a supplement

Verified facts
  • At about 15:30 (AEDT) on 10/12 the NSW spot price reached A$23,107/MWh, close to the market cap; a heatwave took Sydney to 34.7°C and lifted demand by nearly 2,000 MW within an hour; 4 of 12 coal units were offline and 2 derated.1
  • Summerfield: near Mannum, South Australia, 240 MW/960 MWh (doubled from the originally planned 480 MWh); EPC e-STORAGE; 10-year Origin Energy offtake; in April 2026 Palisade agreed to buy 100% from CIP, price undisclosed.3
  • Lower Wonga: near Gympie, Queensland, 380 MWdc solar + 281 MW/843 MWh battery, CIS support, Rio Tinto hybrid offtake, commercial operation end-2028.3
  • ASL 1,500 MW firming tender: at least 8 hours required; AEMO's 2025 Energy Security Target Monitor central scenario shows a gap of about 1,500 MW in 2033–34; consultation closes 11/4.4
  • Hazelwood: existing 150 MW/150 MWh (operating since June 2023), expansion 150 MW/300 MWh, expected completion 2028.5

Summerfield storage resizing (MWh)

Original plan announced 2023/11; source: Energy-Storage.News3

NSW 2033–34 reliability gap estimates (MW)

Different agencies and scenarios; source: Energy-Storage.News4
Analysis
  • Summerfield extended duration from 2 to 4 hours before construction and paired it with a 10-year offtake, a textbook "contract + longer duration" approach consistent with narrowing NEM arbitrage spreads.
  • If the NSW 8-hour firming requirement survives, 4-hour batteries will need support from other revenue (CIS, tolling, ancillary services), while long-duration storage developers may gain a new contract opportunity.
  • Home batteries discharging together during spikes, outside AEMO dispatch, amplify price volatility. For grid-scale arbitrage that is both an opportunity and a source of uncertainty.
Philippines

Buying reliability with a 5-year contract

Verified facts
  • ERC provisionally approved on 10/9, announced 10/12: battery reserve contract between NGCP and East Asia Utilities Corp. (an AboitizPower subsidiary), Mactan, Cebu, 44.72 MW, up to 13 MW regulating reserve + 13 MW contingency reserve, 5 years, provisional rate PHP 5.28/kWh.2
  • The Visayas reserve market average is about PHP 21/kWh.2

Visayas reserves: contract price vs market average (PHP/kWh)

Market average is "about PHP 21/kWh", plotted as 21. Source: Daily Tribune2
Analysis
  • The contract price is only about a quarter of the market average, showing the regulator using long-term contracts to cut consumer costs. Investors gain revenue certainty in exchange for giving up upside from high spot prices.
Japan

The sequence for LTDA projects

Verified facts
  • The Nozu project (Usuki, Oita; 50 MW/196 MWh) won in the FY2023 LTDA and holds a 20-year CPI-linked capacity contract; it reached financial close on 9/14 with non-recourse finance from Aozora Bank, amount undisclosed; on 10/14 Trina Storage was announced as supplier, with completion in Q3 2028.6
Analysis
  • "Award → financial close → equipment locked in" is the standard path for Japanese LTDA projects. Lenders will now focus on construction progress and LTDA performance requirements, especially the COD deadline.
South Korea · Singapore · Taiwan

Other markets

South Korea
  • The Round 3 central-contract ESS tender (1,180 MW / 7.08 GWh) is still in its bidding period, closing 11/11. No new verifiable public developments this week.8
Singapore · Taiwan
  • No major verifiable public grid-scale storage developments this week.
Coming up

Calendar

DateMarketItem
11/03, 11/10PHERC hearings on the NGCP–EAUC battery reserve contract
11/04AUNSW ASL 1,500 MW firming tender consultation closes
11/11KRRound 3 ESS central-contract tender closes
Early 2027AUASL firming tender formally opens (expected)
Sources

Sources

  1. ABC News, "Spring heatwave and coal outages deliver $2m payday for home battery owners", 2026/10/17. abc.net.au
  2. Daily Tribune, "ERC clears Cebu battery deal to ease Visayas power risks", 2026/10/12. tribune.net.ph
  3. Energy-Storage.News, "e-STORAGE commissions 960MWh BESS in South Australia for CIP; Gotion delivers for Lightsource hybrid in Queensland", 2026/10/15. energy-storage.news
  4. Energy-Storage.News, "Australia’s ASL opens consultation on 1.5GW firming tender", 2026/10/15. energy-storage.news
  5. Energy-Storage.News, "Hazelwood BESS expansion in Australia set to double storage capacity at former coal site", 2026/10/20. energy-storage.news
  6. ESS News, "Trina Storage to supply 196 MWh battery in Japan", 2026/10/14. ess-news.com
  7. Energy-Storage.News, "AGL refers 500MWh Abermain BESS in Queensland to Australia’s EPBC Act", 2026/10/16 (headline information only). energy-storage.news
  8. Jodal Economy (조달경제신문), "ESS 3차 입찰 1,180MW 확정", 2026/09. jodaleconomy.com

This report is compiled from public sources, with "verified facts" and "analysis" labelled separately; analysis reflects the author's view and is not investment, credit or legal advice. Undisclosed amounts, rates and contract terms are marked as undisclosed and not estimated.