Glossary · BESS / УЗЕ
What is a BESS — battery energy storage system
A BESS (battery energy storage system) is an industrial energy storage unit: it stores electricity when prices are low and releases it when prices peak or the grid goes down. In Ukrainian documents the same equipment is called УЗЕ (установка зберігання енергії) or СНЕ (система накопичення енергії).
In plain words
Think of a large power bank for a factory or warehouse — that is what commercial energy storage does. At night, when market electricity is cheapest, it charges. In the morning and evening peaks it powers your equipment — the price difference stays with you.
When the grid fails, the BESS picks up the load within milliseconds: machines, checkouts, servers and refrigerators never notice. Backup without fuel, noise or fumes.
Modern systems use LFP cells — the safest lithium chemistry, rated up to 8,000 cycles depending on the model. An EMS runs the system; at SES it is enhanced by our own AI dispatch platform that reads day-ahead market prices daily and decides when to charge and discharge.
Where a BESS earns money for a business
DAM price arbitrage
Charge in the night valley, discharge in the evening peak. The day-ahead market spread is direct revenue — up to 38% off your electricity bill.
Peak shaving
Cut your own demand peaks: lower contracted capacity, lower excess charges, a flatter profile for the grid operator.
Backup power
Uninterrupted operation without a generator: switchover in up to 20 ms, no fuel, no engine maintenance. Critical lines keep running.
Typical payback for C&I projects in Ukraine starts at 3 years. Send us your hourly consumption profile for an exact feasibility study; for a first estimate use the payback calculator on the BESS page.
BESS
- Switchover in up to 20 ms — equipment keeps running
- Earns daily on tariff spreads instead of waiting for outages
- No fuel, fumes or noise — can be installed next to an office
- Minimal maintenance: remote 24/7 monitoring
- Scales in modules — from 30 kWh to megawatt-hours
A BESS for your business: where to start
Four steps from an idea to a working energy storage system. The first three take a few minutes online.
BESS FAQ
What does BESS stand for?
Battery Energy Storage System — an industrial battery with an inverter and controls. In Ukraine the same equipment is called УЗЕ (установка зберігання енергії) or СНЕ.
What is the difference between BESS, УЗЕ and СНЕ?
None — they are synonyms for the same class of equipment. УЗЕ and СНЕ are the Ukrainian terms, BESS is the English abbreviation. On this site we use them interchangeably.
How long does a BESS last?
LFP cells are rated up to 8,000 cycles depending on the model: at one full cycle per day that is 15–20 years. AlphaESS warranty — 10 years on the battery, 5 years on the system.
Do I need permits to install a BESS?
Grid-parallel operation requires technical conditions and a contract with the distribution operator. SES handles this in-house — grid connection is one of our core services.
BESS or a diesel generator?
For short frequent outages and daily savings — a BESS: instant switchover plus tariff arbitrage. For multi-day blackouts a generator can complement the battery, but does not replace its speed and economics.
How much does a BESS cost?
AlphaESS equipment starts at $110/kWh excl. VAT for Aster 5000 containers and goes up to $220/kWh for the STORION-H30/H50-G3 hybrids; STAX G2 — on request. Indicative equipment prices as of October 2026. The final budget depends on capacity, power and system configuration (STS, grid connection, installation). The payback calculator on the BESS page gives a first estimate; send your hourly consumption profile — SES returns a feasibility study with budget and payback within 2 business days.
What is the payback of a BESS in Ukraine?
With a managed profile — night charging, peak discharge, peak shaving — typical payback for industrial projects is 3–5 years. Run your own case in the payback calculator on the BESS page.
How does commercial energy storage differ from a home battery?
Scale and build: industrial systems use LFP cells in IP55 cabinets or 20-ft containers for outdoor installation, with 30 kWh to 5 MWh of capacity, an STS for backup and an EMS that dispatches against DAM prices. A home battery has neither the capacity nor market-driven control.
What storage capacity should I choose?
Capacity and power follow the site’s hourly consumption profile: how much energy to shift from night hours into the peak and which loads to back up. The AlphaESS lineup spans 30 kWh (STAX G2) to 5 MWh (Aster 5000); SES confirms the configuration in a feasibility study.
Size it for your profile?
Send your hourly consumption profile — we will return a feasibility study with real DAM prices.
Request a proposal→