Bessanalytics is a data-driven overview of the UK's expanding battery energy storage system (BESS) fleet, focusing on operational and financial performance. As of September 2024, it monitors approximately 350 assets over 5MW, with an estimated capacity of around 20GW / 36GWh, including over 4GW / 5GWh in operation. Development commenced following the market dislocations resulting from the Truss budget and the website was public in January 2023, capturing data from January 2022 onwards. It caters to those interested in UK utility-scale Lithium-ion batteries, particularly for investment purposes, and assumes the user has a reasonable understanding of the sector's terminology and nomenclature.
Much of the operational and performance data for tracked assets is contractual - the figures reflect what the asset is contracted to deliver.
This applies to all frequency response services, and to revenues and volumes in the balancing mechanism.
Where BMU assets operate in the wholesale market, volumes for physical notifications are identified, but prices at which optimisers contracted to deliver those volumes are not public.
Wholesale revenue estimates must judge the level trades are likely to have taken place based on, among various factors, the size and timing of the volume notifications and the asset's physical characteristics.
Where stated, revenues are adjusted for imbalance charges if the imbalance volumes can be determined from metered data.
There is no visibility for non-BMU assets trading in wholesale markets (whether contracted or at imbalance/NIV chasing), although frequency response revenues are monitored. As a consequence, Non-BMUs are therefore omitted from revenue listings and indices although the database continues to collect their activity. It is likely that aggregate revenue trends in these 'unlit' strategies correlate with those for BMU registered assets where good visibility is available ('lit' strategies). Optimisers are also able to retrade day-ahead positions in the within-day market, particularly in times of volatility. None of this retrading activity is visible and bessanalytics is sympathetic to the suggestion that trading revenue estimates may differ, occasionally materially, from actual recorded revenues. Additionally, where an asset is co-located with another renewable plant such as a wind or solar farm, it is typical that there is an element of behind the meter activity and it is impossible to isolate the activity of the battery alone. Revenues for colocated assets on this website should therefore be treated with caution. Many assets have long term capacity market contracts, and a small number have long term pathfinder contracts. These long dated contractual revenues can be included or excluded from performance tables. These revenues are often outside the control of the optimiser. Embedded benefits for distribution connected assets, such as Use of service (UoS) revenues/charges and legacy variable revenues/charges such as Triads are not included, but might improve revenues compared to figures in this website by an amount in the region of £5k/MW+ for better located sites.
Output from the bessanalytics database is periodically validated against information published in audited or regulatory statements by owners and operators in the industry. This is to verify that the data collection and analysis generates content on this site which is reasonably representative of current actual performance. Specific more detailed validation exercises on individual assets have also been undertaken with industry assistance. These validation exercises indicate typical estimation accuracy is within a reasonable tolerance, with occasional outliers. It is expected that forecast variance will widen as the market transitions to a wholesale model reflecting the greater degree of estimation for wholesale revenues.
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