Working Note: Star Energy Geothermal

Knowledge Snapshot

Last updated: 2026-05-21

Issuer Overview

• Star Energy Geothermal is one of Indonesia's largest geothermal platforms under PT Barito Renewables Energy Tbk (BREN), operating the Salak, Darajat and Wayang Windu geothermal assets in West Java.
• STENGE is a market shorthand, not a single credit scope. Bond analysis should separate the SEGSD restricted group and the SEGWW issuer.
• BREN consolidated is relevant as sponsor and operating backdrop, but it is not the direct repayment source for the SEGSD or SEGWW notes.

Core Credit View

• The credit view is bond-by-bond: SEGSD is a broadly stable low-investment-grade project-bond scope, while SEGWW is an improving but thinner-DSCR BB/Ba3 project-bond scope.
• Long-term PLN/PGE-linked contracts, geothermal baseload characteristics, DSRA/MMRA and distribution restrictions support the credit, but they do not create an Indonesian government or PLN guarantee.
• BREN's 3M2026 disclosure was modestly positive because consolidated revenue, EBITDA and profit increased and the Wayang Windu retrofit was completed, but it did not replace issuer-specific compliance certificates or DSCR calculations.

Business and Franchise View

• Geothermal power provides baseload renewable characteristics and lower fuel-price exposure than thermal power, but resource, well, reinjection, steam supply and major-maintenance risk remain central.
• Salak and Darajat form the SEGSD restricted group and provide two-site diversification.
• Wayang Windu is a single-site repayment source for SEGWW, so successful retrofit/Unit 3 execution and DSCR improvement matter more for rating upside.
• PLN and PGE are policy-important counterparties, but Star Energy is a private group under BREN/Barito, not a government-owned issuer.

Capital Structure and Structural Points

• SEGSD covers Star Energy Geothermal Salak, Ltd / Star Energy Geothermal Darajat II Limited and the 2029/2038 secured green bonds.
• SEGWW covers Star Energy Geothermal (Wayang Windu) Limited and the 2033 secured notes.
• SEGSD and SEGWW differ in assets, ratings, DSCR headroom, collateral packages, distribution restrictions and expansion-funding risk.
• Detailed BREN financials, asset indicators, bond terms, ratings, DSCR references and expansion-project data are stored in data/star_energy_geothermal_source_extract_20260516.json.

Liquidity and Funding View

• Project-bond liquidity analysis should focus on issuer-specific cash, DSCR, DSRA, MMRA, distribution restrictions, cash-trap mechanics, amortisation and current outstanding balances.
• BREN consolidated debt and D/E are useful for sponsor context, but should not be used as a direct substitute for SEGSD or SEGWW liquidity.
• Latest compliance certificates and reserve balances remain unconfirmed.

Credit Strengths

• Large, long-operating geothermal assets with contracted cash flow.
• SEGSD benefits from two-site diversification, multiple units, thicker DSCR in rating materials and amortising secured-note structure.
• SEGWW has improvement potential from Unit 1/2 retrofit, Unit 3 and improved visibility over Unit 1 contract term/tariff.
• BREN's FY2025 and 3M2026 disclosures support the view that the broader geothermal platform remains operationally stable.

Credit Weaknesses

• SEGWW has single-site exposure and thinner DSCR than SEGSD.
• PLN/PGE concentration and Indonesian power-sector policy are unavoidable structural risks.
• Geothermal resource, well, drilling, reinjection and major-maintenance risks can affect generation and DSCR.
• Collateral may exclude main contracts and power-generation assets under Indonesian regulation; recovery under stress depends heavily on contracted cash-flow continuity.
• Current issuer-specific financials, compliance certificates, reserve accounts and market prices are not sufficiently confirmed.

Rating Watchpoints

• SEGSD: Fitch-republished BBB- / Stable and rating-case average DSCR remain the main public guide, but full official Fitch report text is unconfirmed.
• SEGWW: Fitch-republished BB / Stable and Moody's-republished Ba3 / Positive indicate improvement potential, but upgrade expectations depend on Unit 3, subordinated funding, DSCR and contract visibility.
• Any rating action should be read separately for SEGSD and SEGWW.

Recurring Analytical Cautions

• Do not treat STENGE as one issuer or one repayment pool.
• Do not use BREN consolidated EBITDA or D/E as direct evidence of SEGSD/SEGWW DSCR compliance.
• Do not treat PLN/PGE contracts as government guarantees.
• Do not pull forward SEGWW rating improvement until Unit 3, funding subordination, actual DSCR and reserve-account data are verified.

Reliable Core Sources

• BREN Annual Report 2025 and FY2025 performance release.
• BREN 3M-2026 Financial Performance Results and 3M-2026 consolidated financial report.
• Star Energy Geothermal Salak-Darajat Annual Green Bond Report 2025.
• Star Energy Geothermal Wayang Windu Annual Green Bond Report 2025.
• SGX prospectus pages and offering materials for SEGSD and SEGWW.
• Petromindo republications of Fitch and Moody's rating actions, used cautiously until full rating reports are obtained.

Issuer Notes

Last updated: 2026-05-21

Ongoing Follow-Up Items

• Keep SEGSD and SEGWW separate in all analysis, tables, ratings discussion and investment conclusions.
• For SEGSD, monitor Salak Unit 7, Salak Binary, Salak retrofits, Darajat retrofit, actual generation contribution and issuer-specific DSCR impact.
• For SEGWW, monitor Wayang Windu Unit 1/2 retrofit performance, Unit 3 construction, additional funding subordination, bank-loan collateral ranking and actual DSCR recognition.
• Track PLN/PGE payment status, JOC/ESC amendments, tariff interpretation, government audit findings and any regulatory changes.
• Follow geothermal resource performance, well productivity, make-up drilling, reinjection, availability and major-maintenance requirements by field.
• Confirm current outstanding balances, amortisation, waiver/amendment history, DSRA/MMRA balances, cash-trap mechanics and distribution restrictions for each bond scope.
• Check live price, yield, WAL, G-spread, Z-spread and liquidity before making any relative-value judgment.

Unresolved Issues and Items to Check Next Time

• Latest issuer-specific compliance certificates and detailed DSCR calculations for SEGSD and SEGWW are not confirmed.
• Latest DSRA, MMRA, major-maintenance reserve, cash-trap and distribution-lock-up test results are not confirmed.
• Legal current principal amounts after the 2025 Green Bond Reports and BREN 3M2026 borrowings note need reconciliation with trustee or compliance materials.
• Full Salak-Darajat 2020 Offering Memorandum body text has not been directly extracted.
• Full official Fitch and Moody's report texts have not been obtained; current rating detail relies on Petromindo republications.
• PLN/PGE contractual payment history, tariff formula by PPA/ESC, original Unit 1 term/tariff materials and latest JOC/ESC amendments remain unconfirmed.
• Current market prices, yields, spreads, WAL and liquidity remain unconfirmed.

Analytical Cautions

• BREN consolidated financials are sponsor and business-context information, not the direct repayment source for SEGSD or SEGWW.
• SEGSD's two-site diversification and thicker DSCR should not be transferred to SEGWW.
• SEGWW's retrofit completion is positive, but it does not by itself resolve single-site risk, Unit 3 execution risk, additional-debt subordination or thin DSCR.
• PLN/PGE-linked contracts reduce merchant risk but do not create an explicit government guarantee.
• Secured-note language requires careful reading because key contracts and generation assets may be excluded from collateral under Indonesian regulation.
• For geothermal assets, stable historical generation does not eliminate long-term resource, well and maintenance risk.

Report Wording Cautions

• Use "Star Energy Geothermal / STENGE" only as a market shorthand and then specify SEGSD or SEGWW.
• Use "BREN consolidated backdrop" rather than implying BREN EBITDA services the SEGSD/SEGWW notes directly.
• For rating references, specify that Fitch/Moody's information was taken from Petromindo republications unless the official report is obtained.
• Avoid saying SEGWW is approaching SEGSD quality until Unit 3, DSCR, reserve accounts and subordinated funding are verified.

Follow-Up on Management Strategy, Investment Plans, and Financial Policy

• Track BREN's more-than-1,000MW geothermal capacity target, but allocate each project to the correct debt scope before drawing bondholder conclusions.
• Monitor whether expansion funding is parent-level, issuer-level, bank debt, subordinated shareholder loan or internal cash, and whether it affects existing note ranking.
• Watch for sponsor-level leverage, market access or group headlines that could affect investor perception even when project-bond cash flows are ring-fenced.

Items to Check for Ratings and Bond Investors

• SEGSD: current DSCR, DSRA/MMRA, distribution restrictions, outstanding balances, OM covenants and Fitch downside triggers.
• SEGWW: Unit 3 COD, Unit 1/2 retrofit output, subordinated funding, DSCR, DSRA/MMRA, OM covenants and Moody's/Fitch upgrade conditions.
• Both scopes: PLN/PGE payment record, waiver/amendment notices, SGX announcements, trustee reports and live market levels.