Octopus Flux with Solar & Battery: How to Maximise Returns in 2026

What Is Octopus Flux?

Octopus Flux is a bidirectional time-of-use tariff designed specifically for homes with solar and battery storage. Unlike standard export tariffs that pay a flat SEG rate for exported electricity, Flux has three dynamic rate periods: overnight cheap import (currently ~12–15p/kWh from 2am–5am), a standard midday rate (~24p/kWh), and a peak export rate that can reach 20–25p/kWh in the 4pm–7pm evening peak.

This three-way structure allows a solar-battery home to: charge the battery cheaply overnight, self-consume solar during the day, export at premium rates in the evening peak, and recharge again cheaply in the early hours.

Annual Savings with Octopus Flux

The additional value from Flux versus a flat SEG tariff depends on battery capacity, solar generation, and household consumption. For a typical East Anglia home with a 4 kW solar system and 9.5 kWh battery: flat SEG savings approximately £742/year (as calculated in our payback guide). With Octopus Flux: cheap overnight charging worth ~£280/year in avoided peak-rate consumption; premium peak exports worth ~£180/year more than flat SEG. Total annual benefit: approximately £1,200/year.

This reduces the payback on a 4 kW + 9.5 kWh system from 13 years to under 9 years — a meaningful improvement that makes battery storage a much clearer investment.

Which Batteries Are Compatible with Octopus Flux?

Octopus Flux requires a battery system with an API integration that allows Octopus's Kraken platform to schedule charge and discharge automatically. Currently compatible systems include: GivEnergy (via GivTCP integration), Tesla Powerwall (via gateway), Fox ESS (via FoxCloud), Solis (via SolisCloud), and Huawei LUNA2000. We programme the integration during installation and commissioning.

GivEnergy systems are particularly well-suited to Flux because the GivTCP integration allows very fine-grained schedule control, and GivEnergy's cloud platform has robust Flux compatibility. We install GivEnergy systems across East Anglia and configure Flux integration as standard.

Flux vs Other Solar Export Tariffs in 2026

Alternatives to Flux include: Intelligent Octopus Go (7.5p/kWh import overnight, smart EV charging focus), E.ON Next Drive (varies regionally), British Gas Electric Driver (EV focus), and various fixed-rate SEG tariffs at 4–15p/kWh from smaller suppliers. For households with a solar-battery system and moderate-to-high consumption, Flux consistently outperforms fixed SEG tariffs by £200–£500/year.