Wesfin Energy
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Platform

Software that runs storage on the market

This is what Wesfin uses to run battery storage on Ukraine’s power markets: a DAM and IDM bidding optimiser, connection to the site EMS, a multi-site view and a public market-data API.

API documentation Demo dashboard
Markets
DAM, IDM
Equipment
REST · Modbus TCP · IEC 61850
Size
10 MW / 40 MWh
Stage
In preparation

The battery is not trading yet. Prices on this page come from our API; everything else is marked as a model.

DAM prices from our API

The latest day-ahead auction from the Market Operator. The public endpoint /api/dam/latest returns the same data.

DAM · delivery day 2026-10-21

Fresh · for tomorrow

Highest price

6,300.00UAH/MWh

Hour 18:00

Lowest price

24.00UAH/MWh

Hour 13:00

Spread in the day

6,276.00UAH/MWh

Before losses, degradation and fees
0200040006000800000:0003:0006:0009:0012:0015:0018:0021:00UAH/MWh
DAM price

Source: Market Operator, via api.wesfin.energy.

DAM and IDM arbitrage optimiser

A battery charges when power is cheap and discharges when it is expensive. The gap can be large: on 14.04.2026 the DAM price ranged from 11 to 13,767 UAH/MWh within one day. The optimiser decides when a cycle actually pays.

Two cycle families

Night → Morning

Charge in low-price night hours, discharge into the morning peak.

Day → Evening

Charge at midday when solar output pushes prices down, discharge into the evening peak.

If the net spread is below the threshold, the battery waits. A loss-making cycle is not run.

A 36-hour planning horizon: DAM auction results and available IDM data give an hourly schedule that respects the site’s power, energy and limits.

What is taken off the spread

  • Round-trip efficiency

    Part of the energy is lost in each cycle; the optimiser counts what reaches the grid.

  • Degradation

    Each cycle carries a wear cost for the LFP cells, by depth of discharge.

  • Fees and slippage

    Market fees and the gap between the bid and the price actually achieved.

  • State-of-charge band

    Typically 15–85 %, to protect the battery and keep a margin for deviations.

Operator demo dashboard

This is how a battery’s day will look in the dashboard. Prices come from a real auction; the state of charge is modelled, not operating data.

Model · 10 MW / 40 MWh · 14.04.2026

Simulated
00500025100005015000752000010000:0003:0006:0009:0012:0015:0018:0021:00UAH/MWh%
DAM price, 14.04.2026State of charge (model)
Night → Morning
Skipped: spread below threshold
Day → Evening
Charge 12:00–16:00 · discharge 19:00–23:00
Charge band
15–85 %
Open the demo dashboard

Equipment and sites

The platform runs on top of existing equipment and grows with the number of sites.

  • EMS integration

    Connects to the site’s energy management system. An adapter layer translates protocols, so equipment on site stays as it is.

    RESTModbus TCPIEC 61850

  • Multiple sites

    From one container to several sites: one view, combined reports and figures for each site separately.

    OverviewReportsPer site

  • Reports and audit log

    Every bid and command goes into an audit log. Reports are produced as PDF.

    PDFAudit log

Market-data API

DAM prices are open to everyone without a key, with rate limits. Optimiser calculations and FX rates are open to partners with a key.

  • GET/api/dam/{delivery_date}Hourly DAM prices by datePublic
  • GET/api/dam/latestPrices of the latest DAM auctionPublic
  • GET/api/bess/optimize/latestLatest dispatch schedule calculationPartner key
  • GET/api/bess/revenue/latestDispatch result calculationPartner key
  • GET/api/fx/ratesFX rates, UAH/USD and UAH/EURPartner key
API documentation Get a partner key

Who owns this today

The platform belongs to the group; separate Wesfin products sell and run it.

  • Wesfin FlexAggregator

    The group’s aggregator: customers’ storage, solar and flexible demand will reach the market through it. NEURC granted the aggregator licence on 13.10.2026.

    State
    Aggregator licence granted · commercial services not live yet
    For
    Owners of storage, solar and flexible demand
    Open site
  • Wesfin TechnologiesSoftware products

    Sells ERP, a virtual power plant (VPP) and market trading agents to other energy companies.

    State
    Products in use inside the group
    Site
    Not public yet
    Contact us

Investment in the group’s storage is prepared by Wesfin Finance: investors page.

Price: an individual quote

There is no standard price list. We quote from the actual scope: size of the sites, integration and the features needed.

What is included

  • DAM and IDM bidding optimiser
  • Real-time operator dashboard
  • EMS adapter: REST, Modbus TCP, IEC 61850
  • API access with documentation
  • PDF reports and audit log

What changes the price

  • Number of sites and total power, MW
  • Integration complexity and equipment protocols
  • Number of dashboard users
  • SLA tier and support response time
  • Data retention and report frequency

Let’s talk about your site

We’ll show the platform on your data and scope the integration.

Contact usAPI documentation