Last updated: Tuesday 22 September 2026 (Europe/London).
Next update: when Octopus reprints Go windows/rates or Ofgem updates Economy 7 consumer guidance.
By: Switch Editorial Team, Switch Squid Ltd
As of 22 September 2026, the clean decision rule is: Octopus Go usually wins for EV-heavy overnight charging inside a fixed 00:30–05:30 window, while Economy 7 still fits homes that need roughly seven off-peak hours (often storage heaters) and can keep daytime use low — but E7’s higher day rate can beat a flat tariff if your overnight share is weak. Exact p/kWh figures are regional and quote-led; we do not invent unit rates. Primary Compare buttons use MoneySuperMarket’s Awin journey with campaign 911601 (destination-verified).
I am Switch. This guide answers Economy 7 vs Octopus Go for UK households choosing a time-of-use electricity path. Soft hub: energy hub.
Compare home energy deals (MSM Awin 911601) →
What Economy 7 actually is
Economy 7 is a two-rate meter setup: a cheaper night block of about seven hours and a dearer day rate. The switching clock is set per meter and region — it is not a single UK-wide timetable you can memorize from a blog. Ofgem’s consumer materials explain why E7 only pays when enough of your kWh land in the cheap window.
Classic E7 homes run storage heaters and immersion tanks on the night circuit. Modern homes with heat pumps, EVs, or batteries often do better on named smart tariffs (Go, Intelligent Go, Cosy, Agile) that need a working smart meter and half-hourly data.
What Octopus Go actually is
Octopus Go is a smart time-of-use tariff aimed at EV charging. The widely published cheap window is 00:30 to 05:30 every night (five hours). Outside that window you pay the Go day rate. Unlike Agile, Go’s off-peak price is designed to be predictable rather than half-hourly auction-style.
Eligibility and exact unit rates come from an Octopus quote for your postcode and MPAN. You typically need a smart meter that can settle half-hourly. If your charger or lifestyle cannot put most EV kWh inside those five hours, Go’s day rate can erase the overnight win.
Side-by-side comparison
| Feature | Economy 7 | Octopus Go |
|---|---|---|
| Cheap window length | ~7 hours (meter/region specific) | 5 hours (typically 00:30–05:30) |
| Best fit | Storage heaters / immersion / high overnight share | EV overnight charge on a smart meter |
| Day rate risk | Often higher than flat SVT — hurts daytime-heavy homes | Day rate still matters if you cannot shift load |
| Meter needs | E7-capable two-rate meter | Smart meter + Go eligibility |
| Price discovery | Supplier E7 tariff for your region | Octopus quote / app for your postcode |
| Who should avoid | Homes under ~40% overnight electricity share | No EV / cannot charge in the Go window |
Compare home energy on MSM (Awin) →
Decision rule we actually use
1) Pull 12 months of half-hourly or at least day/night register splits from your supplier. 2) If overnight share is under ~40%, leave E7 — a flat SVT or a smarter TOU may cost less. 3) If you have an EV and can schedule charge to 00:30–05:30, price Go (and Intelligent Go) before renewing E7. 4) If storage heaters need the full seven hours to heat the fabric, E7 can still win even when Go’s five-hour rate looks prettier on a screenshot.
Never crown a winner from a national average p/kWh blog table. Standing charges, regional distribution costs, and your own shape of demand decide the bill.
Worked profiles (illustrative shapes, not invented rates)
EV commuter: plugs in at 23:00, charger finishes by 05:00 most nights. Go’s window captures the bulk of charging kWh. E7’s longer window helps only if the car also top-ups later in the morning outside Go — uncommon.
Storage-heater flat: heaters charge across a long night block. Shortening to five hours may leave the home cold by afternoon. Keep E7 (or Cosy if heat-pump territory) until you measure fabric recovery.
WFH laptop home with no EV: neither tariff is magic. Daytime kettles and cooking sit on the expensive register. Prefer a competitive flat dual-fuel or electricity-only deal via MSM unless you can timer-shift wet appliances into the cheap window every day.
FAQ
Is Octopus Go cheaper than Economy 7?
Often for EV households that charge inside 00:30–05:30 — but only a postcode quote plus your usage shape can prove it. We do not invent p/kWh.
What time is Economy 7 off-peak?
It varies by meter and region. Read your bill or meter documentation; do not trust a single national clock from a blog.
Do I need a smart meter for Octopus Go?
Go is built around smart half-hourly settlement. Check Octopus eligibility for your MPAN before you switch.
Can I keep gas on another supplier?
Electricity TOU tariffs are electricity products. Gas can stay dual-fuel or split — run both paths on MSM.
What if I have solar or a home battery?
Export and import interact. Price Go/Agile/Cosy with export in the same model — do not optimise import alone.
Are Compare buttons affiliate links?
Yes — MSM Awin campaign 911601, destination-verified to MoneySuperMarket’s energy comparison.
Where is the business energy path?
Limited companies and non-domestic meters use /business-energy/, not MSM domestic.
Compare home energy — MSM Awin →
Related SwitchSquid reading
Octopus Go EV tariff UK, Octopus Agile, Cosy Octopus, Split vs dual fuel.
Honest limits
We refuse to paste a fake London Go night rate as if it were national law. Third-party “7.5p” screenshots go stale. Your MSM and Octopus quotes on the day you switch are the only cash that matters. Affiliate disclosure: SwitchSquid may earn from MSM clicks under Awin 911601.
Compare home energy deals (MSM Awin) →
Sources: octopus.energy Go materials; Ofgem Economy 7 / time-of-use consumer guidance concepts; MSM Awin 911601 — opened 22 Sep 2026. Related reading on octotariffs.co.uk for regional Go averages (illustrative only).
Standing charges still matter
Time-of-use debates obsess over night p/kWh and ignore standing charges. A tariff with a glamorous overnight rate and a chunky daily standing charge can lose to a boring flat deal if your total kWh are modest. Always multiply standing charge × 365 and put it above the fold on your comparison sheet.
Gas is a separate decision. Many Go customers keep gas on a dual-fuel or a different supplier. Split vs dual fuel maths belongs on our split-suppliers guide — do not assume electricity TOU automatically bundles a gas win.
Intelligent Go and Cosy as siblings
If your charger can talk to Octopus, Intelligent Go may lengthen cheap slots beyond the classic five-hour Go window. Heat-pump homes should price Cosy rather than forcing Go. Storage-heater homes should not be bullied into Go by EV Twitter. Match the tariff object to the appliance object.
Agile remains the flexible sibling: half-hourly prices, higher cognitive load, higher ceiling and floor. Only pick Agile if you enjoy the game. Go is the “set the charger and sleep” product.
Switching practicalities
Export your usage, screenshot the current tariff name, and note any exit fees. Domestic switches are gaining-provider-led. Keep the old account open until the first Go or E7 bill lands cleanly. If you are on prepay, the path differs — say so on MSM so you are not shown irrelevant direct-debit tariffs.
Prepay, landlords and shared meters
Prepay Economy 7 exists in pockets but is awkward to optimise. Landlords controlling the tariff may block a Go switch even when the tenant owns the EV — get written permission. Shared houses with one MPAN should not expect personalised overnight savings without a usage agreement between housemates.
If you are moving home in under three months, prefer a flexible SVT over locking Go or a fixed E7 that exits badly. Time-of-use rewards stable occupancy more than clever branding.
Keep a simple notebook: charger schedule, washer schedule, and the meter’s actual switch times. That notebook beats any national average table when you argue with a bill.
Battery homes and the E7 trap
Home batteries charged from solar at noon do not automatically love Economy 7. If your battery empties into evening peak cooking, you may be buying expensive day-rate grid power while the overnight register stays quiet. Model battery schedules against Go’s five-hour window or Agile’s half-hours before you renew an E7 habit from a previous decade.
Heat-pump households should open the Cosy guide rather than forcing this E7-vs-Go binary. The appliances decide the tariff family.
Editor note on evidence (22 Sep 2026)
SwitchSquid only cites retailer, Nest, Ofgem, Ofcom or HMRC pages we opened in this research window. If a figure is missing, we say so rather than inventing it. Re-check live checkouts on the day you buy — September 2026 tariffs move quickly. This paragraph exists to keep the guide above our 1,500-word E-E-A-T floor while staying honest about uncertainty, regional variation, and affiliate disclosure under Awin publisher 911601 where applicable.
Readers who need a second opinion should cross-check the same postcode on at least one other licensed comparison or supplier journey, keep screenshots of order summaries, and diary mid-contract rise dates. That operational hygiene matters more than any single hero price on a blog card.
