Tariffs

Standard Flux tariff without Kraken intelligent optimisation. Manual scheduling of charge/discharge. Four time-of-use periods with different import and export rates. Rates confirmed via Octopus API for Region D (ENWL), March 2026.

Kraken-controlled tariff with 2-period import pricing (off-peak/peak). Kraken schedules charge/discharge to maximise spread. Import rates confirmed via Octopus API for Region D (ENWL), March 2026. IOF export rates are managed by Kraken and not published via the public API — the export rates shown are estimates based on the Flux export structure.

Half-hourly variable pricing tied to wholesale market via Agile Outgoing export. Best tariff for battery arbitrage due to wide spreads. Rates published day-ahead at 16:00. Can go negative (plunge pricing). Requires smart meter.

EV-focused tariff with 6-hour cheap overnight window. Battery charging possible during cheap window. Kraken may extend cheap periods.

E.ON time-of-use tariff for battery and EV owners. Cheap overnight rate with daytime standard rate.

Heat pump tariff with three cheap windows (morning, afternoon, evening) totalling 8 hours. Stacking potential with battery and heat pump.

EV-focused tariff with cheap overnight rate. Battery can charge during off-peak window.

OVO time-of-use tariff with moderate overnight discount. Reasonable SEG export rate.

Government-mandated export payment. All large suppliers must offer SEG. Rates vary by supplier. Listed rates are best available.

Octopus delivery of the National Grid DFS programme. Rewards measured reduction against household baseline during peak grid stress. Battery export during sessions counts as reduction. Payment (Octopoints) is ON TOP of normal tariff export — no double-counting. Inverter discharge rate is the bottleneck, not battery capacity. Sessions announced ~24h in advance.

National Grid ESO programme — the upstream mechanism behind Saving Sessions. Delivered via energy suppliers (Octopus = Saving Sessions, others have equivalent schemes). DO NOT add DFS revenue on top of Saving Sessions — they are the same events. Listed here for reference only.

Local flexibility tenders in Lancashire and wider ENWL territory. Pay for demand reduction or generation during local network constraints. Active tenders available in Lancaster, Preston, Blackburn areas.

Flexibility marketplace connecting DER assets with DNOs. Register assets, bid into tenders. Revenue varies by location and network need. Transparent tender process.

Annual auction for reliable capacity. Small batteries access via aggregators. Minimum portfolio ~1MW. Revenue is de-rated capacity payment. 4-year contracts available. T-1 cleared at £5/kW/year.

Real-time grid balancing. Small batteries access via aggregator virtual power plants (VPPs). Revenue highly variable but can be significant. Requires fast response.