Behind-the-meter BESS for Vietnamese hotels, factories, and data centres on business or manufacturing tariff. Enter your bill — see what you'd save.
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Decision 963/QĐ-BCT is the proposed restructure of Vietnam's TOU peak hours, issued by MOIT on 22 April 2026 as the implementing decision under Circular 60/2025/TT-BCT. It will apply when EVN's next average retail price adjustment is made. Under the new windows, peak runs 17:30–22:30 Mon–Sat — five continuous hours, no Sunday peak. The morning peak (09:30–11:30) is abolished. Off-peak shifts to 00:00–06:00 daily. Tariff levels under Decision 1279/QĐ-BCT do not change — only the windows move.
Here is the impact when 963 takes effect. For hotels, malls, and commercial buildings, the new window aligns directly with the heaviest evening load — check-in, AC ramp, F&B service, function rooms, late dining. The 3.1× peak/off-peak spread on commercial tariff is unchanged; the hours over which BESS can earn that spread are 66% wider. For factories on manufacturing tariff, pure-solar economics take a revenue cut of up to 20% as the morning peak is abolished — pairing solar with a small battery offsets much of that and keeps solar attractive. For data centres on 24/7 baseload, every cycle dispatches against a continuous five-hour evening peak.
Vietnam's commercial tariff has a 3.1× peak-to-off-peak spread, which under Decision 963 will be earned across a 5-hour continuous evening peak (17:30–22:30 Mon–Sat) once the new windows take effect. Manufacturing tariff doesn't have that spread. That single fact decides whether BESS alone is enough, or whether solar needs to lead and BESS layers on.
Hotels, malls, offices, retail. The 3.1× peak/off-peak spread on commercial tariff makes battery arbitrage work as a standalone investment — earned across the new 5-hour continuous evening peak (17:30–22:30 Mon–Sat) once Decision 963 takes effect, charged at off-peak (00:00–06:00). Roof space is usually small; solar is an optional add-on where it fits.
Large roof, narrow tariff spread. BESS alone doesn't pay back on manufacturing tariff — solar has to lead, with BESS layered on for evening tail and Circular 09 FiT premium on the integrated system. Decision 963 will reduce pure-solar PPA economics by up to 20% when it takes effect (operational data anchored); pairing the array with a small battery offsets much of that and keeps solar attractive. For export manufacturers, the same system delivers I-RECs against Scope 2 emissions — buyer-mandated decarbonisation, not just payback.
Circular 60/2025 (issued 2 December 2025; MOIT guidance 13 February 2026) added roughly 50% to third-party data-centre power bills. On commercial tariff with 24/7 baseload, BESS peak-shaving across the new 5-hour continuous evening peak (17:30–22:30 Mon–Sat under Decision 963 once it takes effect) will be the fastest way to claw that back — every cycle dispatched against a flat baseload, every hour of the wider window earning at the 3.1× spread.
Rob founded SPUC Vietnam — the country's first commercial & industrial solar company — in 2017 as a Dragon Capital joint venture. After SPUC's acquisition he built out BECIS across Vietnam and Cambodia, then served as CEO of CN Green Roof Asia, a Norfund and Climate Fund Managers-backed platform with an $80M portfolio across Vietnam, Cambodia, Indonesia, and the Philippines.
He now runs Arcus Energy independently — originating C&I battery storage deals across Vietnam, with direct supplier relationships, VietinBank as anchor finance partner, and deep regulatory fluency across PDP8, Decree 57, Electricity Law 61/2024, and Vietnam's current tariff structures.
Own the asset and keep the full saving. Or pay nothing upfront and share the saving with us. Vietnamese bank debt is available under the Self-Invest route.
You fund and own the system. Typical 5-year payback, 14.9% project IRR, 18.5% equity IRR at 50% gearing. Vietnamese bank debt available at 8–9.5% p.a., 5–8 year tenor.
How Self-Invest works →We fund and own the system. You buy the stored electricity at a rate below EVN peak, on a 10–15 year contract. Off balance sheet. Start saving from month one.
How Zero Capex works →Thirty-minute consultation. You'll walk away with a payback number, a ten-year savings estimate, and a clear view of which financing option fits.