Vitreous LabsEnergy transparency

Zenobe Energy

Owns 21 batteries at 10 sites, 766 MW, which is 9.9 per cent of everything operating in Great Britain. It sells 706 MW of that itself and the rest through EDF Energy Customers Limited and Erova Energy Limited.

21batteries, counting a re-registered battery once
766 MWof the 7,779 MW operating fleet
£32/kW/yrpaid across the three measured lines, against £42 for the whole fleet
20 of 21confirmed on a control filing or the owner's own statement, the rest 1 probable

Who sells its power

The balancing mechanism register names the company allowed to sell each unit's power. That company is usually an optimiser or a supplier working under contract, which is why the registers cannot answer the ownership question on their own. Where the seller is one of the owner's own companies, the row says so.

Zenobe Kilmarnock South LTD 313 MW · Zenobe Blackhillock Limited 209 MW · Zenobe Capenhurst Limited 105 MW · Zenobe Wishaw Limited 51 MW · others 89 MW
SellerBatteriesMWOf this fleet
Zenobe Kilmarnock South LTD the owner's own company631341%
Zenobe Blackhillock Limited the owner's own company420927%
Zenobe Capenhurst Limited the owner's own company410514%
Zenobe Wishaw Limited the owner's own company1517%
EDF Energy Customers Limited3507%
BESS Holdco 2 Limited the owner's own company1203%
Erova Energy Limited1101%
Zenobe Energy Limited the owner's own company191%

BESS Holdco 2 Limited is marked the owner's own company: Bess Holdco 2 Limited runs through IFM Master Holdco Limited to Zenobe Energy Limited at 75% or more. Source.

What it was paid

The three published lines, added up across the fleet for the 364 days to 27 September 2026. Wholesale trading income is invisible for every owner, not just this one, and nothing here nets the cost of charging. The rate is per kilowatt of current capacity.

Balancing mechanism, paid to discharge£6.6m
Balancing mechanism, paid out to charge−£25.0m
Response and reserve auctions£12.1m
Capacity market£6.0m
Income across the fleet, per kilowatt£32.30/kW/yr fleet 42.17
Median battery, all three lines£32.68/kW/yr
Hours at full power, sent out78 h/yr
Hours at full power, taken in616 h/yr

What the fleet is made of

Duration, by megawatt

about 1 hour 135 MW · 2 hours and up 584 MW · not published 47 MW

Region, by megawatt

Scotland 572 MW · England and Wales 194 MW

Every battery it owns

BatteryMWSold byGrade£/kW/yr
Zenobe Blackhillock (BLHLB-4)
North Scotland
54Zenobe Blackhillock Limitedconfirmed3.81
Zenobe Blackhillock (BLHLB-3)
North Scotland
54Zenobe Blackhillock Limitedconfirmed9.32
East Ayrshire (KILSB-3)
South West Scotland
54Zenobe Kilmarnock South LTDconfirmed19.17
East Ayrshire (KILSB-1)
South West Scotland
53Zenobe Kilmarnock South LTDconfirmed17.16
East Ayrshire (KILSB-4)
South West Scotland
52Zenobe Kilmarnock South LTDconfirmed32.68
East Ayrshire (KILSB-2)
South West Scotland
52Zenobe Kilmarnock South LTDconfirmed17.46
East Ayrshire (KILSB-6)
South West Scotland
51Zenobe Kilmarnock South LTDconfirmed12.14
Wishaw BESS
Lothian and Borders
51Zenobe Wishaw Limitedconfirmed62.08
East Ayrshire (KILSB-5)
South West Scotland
51Zenobe Kilmarnock South LTDconfirmed15.14
Zenobe Blackhillock (BLHLB-2)
North Scotland
50Zenobe Blackhillock Limitedconfirmed47.49
Zenobe Blackhillock (BLHLB-1)
North Scotland
50Zenobe Blackhillock Limitedconfirmed7.89
Aylesford
Essex and Kent
30EDF Energy Customers Limitedconfirmed84.45
Zenobe Capenhurst (PINFB-1)
North Midlands and North Wales
27Zenobe Capenhurst Limitedconfirmed60.15
Zenobe Capenhurst (PINFB-4)
North Midlands and North Wales
26Zenobe Capenhurst Limitedconfirmed34.94
Zenobe Capenhurst (PINFB-3)
North Midlands and North Wales
26Zenobe Capenhurst Limitedconfirmed34.53
Zenobe Capenhurst (PINFB-2)
North Midlands and North Wales
26Zenobe Capenhurst Limitedconfirmed34.30
ZEN02A
Mid Wales and The Midlands
20BESS Holdco 2 Limitedconfirmed85.85
Zenobe Brindley
Cotswold
12EDF Energy Customers Limitedconfirmed134.29
North West Leicestershire (BEROV001)
Mid Wales and The Midlands
10Erova Energy Limitedprobable0.00
Kings Barn Farm
Oxfordshire, Surrey and Sussex
9Zenobe Energy Limitedconfirmed30.72
Hill Farm
Mid Wales and The Midlands
8EDF Energy Customers Limitedconfirmed57.74

One battery ran under an earlier registration for part of the year, BBPG01. The money earned under the earlier code is in the book above; the capacity is counted once.

How we know

Confirmed means a control filing at Companies House, or the owner's own published statement, names the company. Probable means the evidence is strong and indirect. Named means the register leaves the owner blank, the balancing code carries the owner's initials, and a sibling unit at the same site is already settled. Each chain below is printed once, with the batteries it settles.

Confirmed Zenobe Blackhillock (BLHLB-4), Zenobe Blackhillock (BLHLB-3), Wishaw BESS, Zenobe Blackhillock (BLHLB-2), Zenobe Blackhillock (BLHLB-1), Zenobe Capenhurst (PINFB-1), Zenobe Capenhurst (PINFB-4), Zenobe Capenhurst (PINFB-3), Zenobe Capenhurst (PINFB-2), Zenobe Brindley
The SPV name carries the group; kept here so the page reads consistently. Source

Confirmed East Ayrshire (KILSB-3), East Ayrshire (KILSB-1), East Ayrshire (KILSB-4), East Ayrshire (KILSB-2), East Ayrshire (KILSB-6), East Ayrshire (KILSB-5)
The register names no owner for these six units. The lead party is Zenobe Kilmarnock South Limited, whose filings give Zenobe Blackhillock Borrower Limited as its controller since January 2024 and Zenobe Energy Limited before that. Source

Confirmed Aylesford, North West Leicestershire (BBPG01) (earlier registration), Kings Barn Farm, Hill Farm
Bess Holdco 2 Limited is held by IFM Master Holdco Limited, and IFM Master Holdco is itself held at three quarters or more by Zenobe Energy Limited. The Bess Holdco companies and Zenobe share one registered office at Burdett House. For the two units the register leaves blank, the capacity market holds Hill Farm Packington and Aylesford in Bess Holdco names at the same places. Source

Confirmed ZEN02A
The register names no owner. The capacity market holds a site called Claredown belonging to Bess Holdco 4 Limited, the renewables planning database gives Claredown Farm to Zenobe under its former name Energy Reservoir 15 at the same 20 MW, and the Bess Holdco companies run through IFM Master Holdco Limited to Zenobe Energy Limited. Source

Probable North West Leicestershire (BEROV001)
The register names no owner and places this unit only by postcode district. Hill Farm Packington, held by Bess Holdco 2 Limited, sits inside that district and already carries two other units. Source

Attribution. A battery belongs to whoever the documents name today, so a fleet that changed hands during the year credits the whole year to the current owner. Groups are joined only where a filing joins them; a company that holds through several vehicles appears once, under the name at the top of the chain. Directors and registered offices are never used as evidence on their own. Why the registers cannot answer this question

All owners