Intelligent Octopus Go Solar Battery Storage Dynamic Tariff Guide

Key Takeaways

• Intelligent Octopus Go delivers a dedicated off-peak electricity rate from only 8p/kWh, offering up to 69% savings against average price cap rates.
• The tariff guarantees six hours of cheap electricity every night between 11:30pm and 05:30am for the entire household.
• When smart EV charging is dispatched during daytime hours outside the off-peak window, the whole-home electricity consumption drops to the discounted rate.
• Customers on fixed Intelligent Octopus Go typically saved £771 compared to standard variable tariffs last year.
• Pairing Intelligent Octopus Go with Outgoing Octopus allows solar exports to earn a flat 12p per kWh or 16p per kWh during evening prime hours (4pm-7pm).
• A smart meter supporting half-hourly data (such as SMETS2) is required for participation.

The Economics of Intelligent Time-of-Use Energy

Intelligent Octopus Go is widely recognised as Britain's most popular EV time-of-use tariff. In their latest State of the market report, Ofgem reported that 653,000 domestic customers were subscribed to a Smart Time of Use EV tariff in July 2025, with Octopus supplying over half the market.

The core appeal of the tariff lies in its dual structure:

• Off-Peak Unit Rate: Electricity is priced from only 8p/kWh during designated off-peak periods.
• Price Cap Benchmark: Compared to the July 2026 Ofgem energy price cap standard variable unit rate of 26.11p/kWh, the 8p/kWh rate represents a 69% reduction in volumetric import costs.
• Customer Savings: Over the annual cycle from May 2025 to April 2026, customers on fixed Intelligent Octopus Go tariffs typically saved £771 compared to the Flexible Octopus standard variable baseline.

Operating Rules: Overnight Windows and Dynamic Smart Charging Slots

Unlike legacy Economy 7 meters that rely on static, mechanical switching, Intelligent Octopus Go uses advanced cloud-based API telemetry to schedule consumption:

Core Overnight Off-Peak Window

Every night between 11:30pm and 05:30am, customers receive a guaranteed six-hour off-peak window. During this six-hour block, all household electricity consumption—including heat pumps, domestic appliances, and stationary battery charging—is billed at the 8p/kWh unit rate.

Dynamic Smart Daytime Slots

When an EV is plugged in and the driver specifies a target state of charge via the Octopus app, the automated dispatch engine evaluates wholesale market price signals:

• Octopus automatically schedules charging during the cheapest half-hourly wholesale periods across the 24-hour cycle.
• Whenever smart charging is scheduled outside the standard overnight window (11:30pm to 05:30am), the discounted off-peak rate applies to the entire home's electricity demand during that slot.

Integrating Solar PV and Stationary Battery Storage

For homes with solar panels and stationary home storage batteries, Intelligent Octopus Go unlocks powerful arbitrage opportunities:

Overnight Battery Pre-Charging

During winter months when solar generation is minimal, the home battery can be fully charged from the grid between 11:30pm and 05:30am at 8p/kWh. The stored electricity then discharges during high-rate daytime hours, shielding the home from peak standard rates.

Export Optimization via Outgoing Octopus

Homeowners with solar arrays can export surplus generation via complementary export tariffs:

• Outgoing Octopus (Flat Rate): Pays a guaranteed 12p per kWh for every unit of electricity exported to the grid.
• Prime Outgoing Octopus: Delivers an enhanced 16p per kWh rate during the evening prime window between 4pm and 7pm, returning a steady 9p per kWh across the rest of the day. This 12-month fixed-term agreement carries no exit fees.
• Agile Outgoing Octopus: Matches half-hourly export payments to uncapped day-ahead wholesale electricity prices, ideal for advanced automated battery systems exporting during scarcity spikes.

Metering, Grid Registration, and Hardware Prerequisites

Deploying Intelligent Octopus Go alongside solar and storage requires compliance with UK metering standards:

Smart Meter Compatibility

Participants must possess an operational smart meter capable of half-hourly communication with the central data network. Almost all SMETS2 meters and compatible SMETS1 units support this functionality.

Export MPAN Registration

To begin exporting solar power, Octopus registers the installation with the relevant Distribution Network Operator (DNO):

• Octopus applies to the local DNO to issue a unique Export Meter Point Administration Number (MPAN).
• The DNO generation and registration process typically takes between 1 and 4 weeks.
• Once established, Octopus enrols the export MPAN within approximately 5 days.

Home EV Charging Hardware

Customers integrating electric vehicles can utilise approved chargers, with hardware like Ohme or Octopus smart chargers available starting from £949 including standard domestic installation.