Hawthorn Pit BESS
60 MW, about 120 MWh (2 hours, from the capacity market de-rating class) in North East England. Everything on this page is read from published data for the 364 days to 27 September 2026, or is labelled as an estimate.
What it is
| Registered power | 60 MW balancing mechanism registration |
| Storage duration | 2 hours capacity market de-rating class |
| Charging zone | North East England |
| Balancing mechanism unit | 2__FBPGM002 |
Who owns it and who trades it
| Traded by | BP Gas Marketing Limitedruns several sitesconfirmed, Elexon's register |
| Owned by | HEIT HP LIMITED |
| Owner established from | capacity market registered holder |
| Ultimately | Harmony Energy Income Trust (assets under Foresight Group) probable source |
How we know. The HEIT SPV naming; the trust sold its assets to Foresight.
Market registers name the party that sells into the market, which for a battery is usually an optimiser under contract rather than the owner. Elexon's balancing mechanism unit register names the seller here and the name is checked against it on every build. How we tell them apart
What it is built from
| Battery system | Envision Energy, two hour liquid cooled |
| Entered operation | 2024-09 (energisation announced 12 September 2024) |
| Planning reference | the NatPower neighbour is DM/25/02255/FPA; this site's own reference not yet found |
From published documents, not from any register: supplier and contractor project pages, owner announcements and the trade press. Confidence: confirmed. Checked 2026-08-30. source 1 · source 2. Fields not shown are not published anywhere we have found, and we do not guess them.
What it earned
| Line | 364 days to 27 September 2026 |
|---|---|
| Balancing mechanism | −£399k |
| Response and reserve auctions auction implied | £0 |
| Capacity market | £271k |
| Three lines together | not netted |
Balancing is offer revenue and does not net off the cost of the power. The response and reserve figure is the value implied by the published auction results, award quantity times clearing price times the length of the delivery window, and not a settled payment. Capacity market income is the cleared price raised for inflation where the auction set a base period, split by month on EMRS's weights. Method
Outside the balancing mechanism, derived from the meter
Elexon publishes what this unit's meter recorded every half hour. Take away the balancing volumes NESO accepted and what is left is the position the unit ran outside the balancing mechanism: its wholesale trading, its frequency response delivery, and its losses, together. This unit held no frequency response contract in the window, so the whole position is treated as traded. The volumes are measured. The prices are public benchmarks, not this unit's trades. The product is derived, and is shown apart from the three measured lines above. 346 days to 12 September 2026, 33 of them still provisional in Elexon's settlement runs. Method and caveats
| Line | MWh or £ |
|---|---|
| Metered export, what crossed the meter out | 41,085 MWh |
| Metered import, what crossed the meter in | 47,572 MWh |
| Equivalent full cycles, everything sent out over one full charge | 342 over 346 days, 361 a year at that rate |
| Apparent meter to meter efficiency | 86%, an ordinary battery: round trip losses alone |
| Balancing offers accepted | 17,033 MWh |
| Balancing bids accepted | 32,717 MWh |
| Position outside balancing, export | 50,225 MWh |
| Position outside balancing, import | 41,028 MWh |
| Valued at the market index, sold | £5.3m |
| Valued at the market index, bought | £3.3m |
| Outside balancing, net, at the index | £2.0m |
| Balancing and outside balancing together | £1.7m £29.76/kW/yr |
When it moved, against when power was dear
Across every half hour this unit was metered the market index averaged £93.43. What it sent out was worth £105.47 a megawatt hour at that same index, 1.13 times the average. What it took in was worth £79.86, 0.85 times. Selling above one and buying below one is a unit positioned into the dear half hours and out of the cheap ones. It measures the half hours it chose, not the price anyone paid it, which is not published.
What it paid to buy energy back
When NESO accepts a bid, this unit delivers less than it had already sold, or takes more in. It pays for the energy it no longer delivers, and that payment is most of what makes the balancing figure above negative. Whether that is a cost or a margin depends on the price it paid. Across 32,717 MWh of accepted bids it paid an average of £71.23 a megawatt hour. The market index averaged £101.48 across those same half hours, so it bought back at £30.25 a megawatt hour below the going price.
| Price it paid | Volume | Average | Cash |
|---|---|---|---|
| below zero | 2,203 MWh | −£21.21 | £47k received |
| £0 to £25 | 2,430 MWh | £11.99 | £29k |
| £25 to £50 | 3,116 MWh | £38.81 | £121k |
| £50 to £75 | 7,576 MWh | £63.94 | £484k |
| £75 to £100 | 10,353 MWh | £86.18 | £892k |
| above £100 | 7,039 MWh | £120.79 | £850k |
On 2,203 MWh the price was below zero: NESO paid this unit an average of £21.21 a megawatt hour to take energy, £47k in all. That is a constrained network with more generation on it than it can move.
The other direction, offers, is much smaller here: 17,033 MWh where NESO asked for more, paid at an average of £117.57 against an index of £89.12.
Physical checks passed: the meter never exceeded the registered power by more than fifteen per cent, and the year's exports against imports are what a battery does.
Where it stands
| Balancing incomewhole fleet, £/kW/yr | 64th percentile98 units | |
| Balancing incomeEngland and Wales peer group | 49th percentile70 units | |
| Balancing income2.0 hour duration cohort | 52nd percentile61 units | |
| All three measured lineswhole fleet, £/kW/yr | 64th percentile229 units | |
| Energy sent outhours at full power | 69th percentile96 units | |
| Energy taken inhours at full power | 82nd percentile96 units |
Percentiles, so 90 means better than nine in ten of the cohort named beside it, on that measure alone, over the same 364 days. Rates are pounds per kilowatt per year, annualised over the days the unit has been on the system, the same figures the performance league ranks on. A high position in the taken-in table is not a fault: a constraint asset is paid to charge, and charging is its job.
The nearest comparables
The five nearest in size in England and Wales, and this battery among them, ranked by what each was paid for every kilowatt it holds over the 364 days to the same date. They run for about the same length of time. Same market, same rules, same weather.
| Battery | MW | Hours | Measured, per kW |
|---|---|---|---|
| Ocker Hill | 58 | 2h | £64.0/kW/yr |
| Monk Fryston | 57 | 2h | £44.4/kW/yr |
| Sizing John | 57 | 2h | £43.4/kW/yr |
| Capenhurst | 57 | 2h | £24.9/kW/yr |
| Native River | 57 | 2h | £20.8/kW/yr |
| Hawthorn Pit BESSthis battery | 60 | 2h | not netted |
The three lines are not added together for this site. It paid £2.5m to charge and the lines we can measure paid it £2.4m. The energy it bought was sold in the wholesale market and nothing published measures that sale, so subtracting one from the other would show a loss it does not make.
See it on the map
Every figure on this page traces to a published file. If something here is wrong about your asset, the methods section says how to tell us.