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So Mongoose 12m by So Energy: regional prices, payment types, fuel options & Economy 7

A UK-focused guide to every current version of So Mongoose 12m from So Energy, including Dual Fuel, Electricity options, payment methods such as Monthly Direct Debit, Economy 7 and standard-rate versions and pricing across 13 PES regions.

  • See the main So Mongoose 12m option groups in one place
  • Check region-by-region unit rates and standing charges for your exact service type, payment method and meter setup
  • Compare this tariff fairly with the wider market using your postcode and usage
Switch to So Energy — check your price See all So Energy tariffs

Unit rates and standing charges vary by region, meter type, service type and payment method. A postcode-level quote is still the fairest comparison.

Fast answer: what most people should know about So Mongoose 12m

So Mongoose 12m is best treated as a single tariff family page because the same tariff name can appear across multiple service types, payment methods, Economy 7 settings and 14 PES regions. The best version for you depends on your postcode, meter setup and how you actually pay for energy.

What our price data says: So Mongoose 12m is on sale: a fixed tariff for 12 months, exit fee £75 per fuel. Against the Ofgem cap for 1 October to 31 December 2026 its electricity unit rate is above the cap in every region (by 2.80 to 3.62p/kWh) and its standing charge is below the cap in 7 of 14 regions and above it in 7 (from −2.13p a day to +2.31p a day). In London the unit rate is 29.92p against a 26.60p cap and the standing charge 40.88p a day against 42.92p; a home at Ofgem typical use (2,500 kWh of electricity and 9,500 kWh of gas a year, Direct Debit) could pay about £2,010 a year on this tariff against £1,706 at the cap (+£304), standing charges included. See every region

Editor's rule of thumb: compare only like-for-like. If you are on Direct Debit, compare Direct Debit. If you need Economy 7, compare Economy 7. If you want dual fuel, do not compare it against an electricity-only row and assume the result is equivalent.

Key takeaways

  • Service types: Dual Fuel, Electricity
  • Payment methods: Monthly Direct Debit
  • Regions covered: 13 PES regions
  • Economy 7: available on at least one option group
  • Exit fee: up to £75.00 per fuel

What to have ready

  • Your postcode for regional pricing
  • Your meter type, including Economy 7 if relevant
  • Your annual usage or a recent bill
  • Your preferred payment method
  • Whether you need electricity-only, gas-only or dual fuel

If you're in a hurry

Use a whole-of-market quote first, then check the exact row in the regional tables below that matches your setup.

Compare prices with your postcode

Compare So Mongoose 12m with the wider market

This tariff can look different depending on region, service type, payment method and Economy 7 status. That means the fairest comparison is always postcode-based and like-for-like.

Good to know: a tariff that looks cheapest in one PES region may not be cheapest in another. Use your postcode rather than relying on a headline national figure.

What happens after you compare?

  1. We estimate annual costs using your postcode, meter type and payment method.
  2. You can compare that result with the relevant So Mongoose 12m option group on this page.
  3. If you proceed, choose the exact regional row that matches your setup before switching.

Always review tariff facts and contract terms before you complete a switch.

Get your whole-of-market quote

Tell us a few details to see estimated prices, including So Energy tariffs where available for your postcode, meter and payment method.

Start your comparison

By submitting, you confirm this is for a UK home energy comparison. We’ll use your details to provide quotes and contact you about your comparison. You can opt out at any time.

So Mongoose 12m option groups explained

To keep this page useful and SEO-friendly, we group the underlying records by service type, payment method and Economy 7. Inside each group, you can then see the regional prices across the PES areas we hold.

Fuel / service types

Current records show these service types for So Mongoose 12m: Dual Fuel, Electricity.

  • Dual fuel can be convenient but is not always cheapest.
  • Single-fuel options may suit households comparing separate suppliers.

Payment types

Current payment methods listed include Monthly Direct Debit.

  • Always compare the same payment method.
  • Direct Debit, bill payment and prepayment can produce different annual costs.

Regional prices

This page includes regional records across 13 PES regions, because energy prices are not the same everywhere in Great Britain.

  • Use postcode-based quotes for the most accurate comparison.
  • Unit rates and standing charges vary by region and are shown in the tables below.

Internal links for this tariff cluster

Read our So Energy supplier guide, browse all So Energy tariffs, or compare broader categories such as Economy 7, dual fuel and Direct Debit tariffs.

Lowest electricity unit rate shown

The lowest electricity unit rate currently shown is 28.621p/kWh under the Dual Fuel / Monthly Direct Debit / standard-rate option group. Rates range up to 30.938p/kWh across regions for this group. A postcode-level quote is needed to estimate your annual cost.

So Mongoose 12m comparison table (grouped by option type)

This summary table groups the tariff by the differences that matter most: service type, payment method and Economy 7. Each row then links to a regional breakdown so you can see all PES-region unit rates and standing charges.

Service type Payment method Economy 7 Regions Elec rate range (p/kWh) Contract Exit fee (per fuel) Details
Dual Fuel Monthly Direct Debit No 14 28.621 – 30.938 12 months £75.00 View regional prices
Dual Fuel Monthly Direct Debit Yes 14 33.311 – 38.806 12 months £75.00 View regional prices
Electricity Monthly Direct Debit No 14 28.621 – 30.938 12 months £75.00 View regional prices
Electricity Monthly Direct Debit Yes 14 33.311 – 38.806 12 months £75.00 View regional prices

Decision checklist

  • Pick the right fuel/service type first.
  • Keep the payment method the same across comparisons.
  • Only choose an Economy 7 row if your meter and usage pattern suit it.
  • Use your postcode to sense-check the regional prices.

Why regional rows matter

  • Standing charges and unit rates vary by PES region.
  • A tariff that looks cheap nationally may be less competitive in your area.
  • Regional differences can materially change annual cost estimates.

So Mongoose 12m against the Ofgem price cap, 1 October to 31 December 2026

So Mongoose 12m is on sale: a fixed tariff for 12 months, exit fee £75 per fuel. Against the Ofgem cap for 1 October to 31 December 2026 its electricity unit rate is above the cap in every region (by 2.80 to 3.62p/kWh) and its standing charge is below the cap in 7 of 14 regions and above it in 7 (from −2.13p a day to +2.31p a day). In London the unit rate is 29.92p against a 26.60p cap and the standing charge 40.88p a day against 42.92p; a home at Ofgem typical use (2,500 kWh of electricity and 9,500 kWh of gas a year, Direct Debit) could pay about £2,010 a year on this tariff against £1,706 at the cap (+£304), standing charges included.

Electricity unit rate, p/kWh and standing charge, p/day for each region against the Ofgem capElectricity unit rate, p/kWhStanding charge, p/daythis tariffOfgem cap25262728293031323540455055606570East MidlandsEast Midlands: 28.62p/kWh vs cap 25.36p (+3.26p)+3.26pEast Midlands: standing charge 51.72p/day vs cap 51.45p (+0.27p/day, +£1 a year)+0.27pNorth EastNorth East: 28.69p/kWh vs cap 25.46p (+3.23p)+3.23pNorth East: standing charge 61.47p/day vs cap 61.58p (−0.11p/day, level a year)−0.11pWest MidlandsWest Midlands: 28.94p/kWh vs cap 25.60p (+3.34p)+3.34pWest Midlands: standing charge 56.62p/day vs cap 57.23p (−0.61p/day, −£2 a year)−0.61pYorkshireYorkshire: 29.14p/kWh vs cap 25.60p (+3.54p)+3.54pYorkshire: standing charge 60.01p/day vs cap 61.67p (−1.66p/day, −£6 a year)−1.66pNorth ScotlandNorth Scotland: 29.19p/kWh vs cap 26.35p (+2.84p)+2.84pNorth Scotland: standing charge 55.39p/day vs cap 55.14p (+0.25p/day, +£1 a year)+0.25pSouth ScotlandSouth Scotland: 29.24p/kWh vs cap 26.11p (+3.13p)+3.13pSouth Scotland: standing charge 60.85p/day vs cap 61.41p (−0.56p/day, −£2 a year)−0.56pSouthernSouthern: 29.31p/kWh vs cap 26.47p (+2.84p)+2.84pSouthern: standing charge 49.64p/day vs cap 47.81p (+1.83p/day, +£7 a year)+1.83pSouth WestSouth West: 29.44p/kWh vs cap 26.58p (+2.86p)+2.86pSouth West: standing charge 56.71p/day vs cap 55.58p (+1.13p/day, +£4 a year)+1.13pSouth EastSouth East: 29.68p/kWh vs cap 26.88p (+2.80p)+2.80pSouth East: standing charge 53.15p/day vs cap 52.32p (+0.83p/day, +£3 a year)+0.83pEasternEastern: 29.77p/kWh vs cap 26.61p (+3.16p)+3.16pEastern: standing charge 51.65p/day vs cap 51.84p (−0.19p/day, −£1 a year)−0.19pSouth WalesSouth Wales: 29.79p/kWh vs cap 26.55p (+3.24p)+3.24pSouth Wales: standing charge 55.53p/day vs cap 55.41p (+0.12p/day, level a year)+0.12pLondonLondon: 29.92p/kWh vs cap 26.60p (+3.32p)+3.32pLondon: standing charge 40.88p/day vs cap 42.92p (−2.04p/day, −£7 a year)−2.04pNorth WestNorth West: 30.11p/kWh vs cap 26.49p (+3.62p)+3.62pNorth West: standing charge 47.99p/day vs cap 45.68p (+2.31p/day, +£8 a year)+2.31pMerseyside & N WalesMerseyside & N Wales: 30.94p/kWh vs cap 27.86p (+3.08p)+3.08pMerseyside & N Wales: standing charge 65.53p/day vs cap 67.66p (−2.13p/day, −£8 a year)−2.13p
RegionElec p/kWhCap p/kWhStanding p/dayCap p/dayStanding £/monthGas p/kWhGas capGas standing p/day£/yr typicalCap £/yrvs cap
East Midlands28.6225.3651.7251.4515.7310.317.8229.491,9911,672+£319
North Eastern England28.6925.4661.4761.5818.7010.237.9229.492,0211,722+£299
West Midlands28.9425.6056.6257.2317.2210.437.9029.492,0291,708+£321
Yorkshire29.1425.6060.0161.6718.2510.297.9029.492,0331,724+£308
Northern Scotland29.1926.3555.3955.1416.8510.187.8729.492,0061,717+£290
Southern Scotland29.2426.1160.8561.4118.5110.247.8729.492,0341,734+£300
Southern England29.3126.4749.6447.8115.1010.638.1729.492,0311,719+£312
South Western England29.4426.5856.7155.5817.2510.448.1229.492,0431,746+£297
South Eastern England29.6826.8853.1552.3216.1710.448.0529.492,0351,735+£301
Eastern England29.7726.6151.6551.8415.7110.297.9129.492,0181,713+£305
Southern Wales29.7926.5555.5355.4116.8910.518.0929.492,0541,744+£310
London29.9226.6040.8842.9212.4410.588.1529.492,0101,706+£304
North Western England30.1126.4947.9945.6814.6010.297.8629.492,0131,684+£329
Merseyside and Northern Wales30.9427.8665.5367.6619.9310.287.9129.492,0971,805+£292
Source: this tariff's newest published rates in our tariff feed (snapshot 15 Oct 2026; electricity without VAT (zero-rated 1 Oct 2026 to 31 Mar 2027); gas including 5% VAT; Monthly Direct Debit, single-rate meter). Cap: Ofgem's regional price cap, 1 October to 31 December 2026, Direct Debit, single-rate, as published (https://www.ofgem.gov.uk/your-energy-supply/your-energy-bill/energy-price-cap-unit-rates-and-standing-charges). Annual figures are modelled at Ofgem typical use (2,500 kWh of electricity and 9,500 kWh of gas a year, Direct Debit), standing charges included, before any discounts or credits; what you pay depends on your usage and meter.

The cheapest fixed deal on the EnergyPlus panel today, against So Mongoose 12m and the cap

This tariff
£2,010
So Mongoose 12m · fixed, 12 months · exit fee £75 per fuel
Cheapest fixed deal on the EnergyPlus panel
£1,685.03
Fuse Energy · October 2026 Fixed (24m) V4 · fixed, 24 months · exit fee £50 per fuel (£100 dual fuel)
The cap for the same home
£1,706
Ofgem cap, London, 1 October to 31 December 2026 · Direct Debit, standard variable

On 15 Oct 2026 the cheapest fixed tariff on the EnergyPlus panel for a London home at Ofgem typical use was October 2026 Fixed (24m) V4 from Fuse Energy at £1,685.03 a year, −£325 against this tariff's modelled £2,010 and −£21 against the £1,706 cap; the cheapest of any type was So Green Tracker 12m from So Energy at £1,653.46 (tracker, 12 months, exit fee £50 per fuel). 18 fixed tariffs were quoted that day. Exit fees and contract lengths differ, so compare the row that matches your meter and payment method.

RegionThis tariff £/yrvs capvs cheapest fixedCap £/yrCheapest fixed on the panel (£/yr, exit per fuel, term)Quoted
Eastern England2,018+£305+£3201,713Fuse Energy · October 2026 Fixed (24m) V4 · £1,698.11 · exit £50 · 24m15 Oct
East Midlands1,991+£319+£3331,672Fuse Energy · October 2026 Fixed (24m) V4 · £1,658.06 · exit £50 · 24m15 Oct
London2,010+£304+£3251,706Fuse Energy · October 2026 Fixed (24m) V4 · £1,685.03 · exit £50 · 24m15 Oct
Merseyside and Northern Wales2,097+£292+£3161,805Fuse Energy · October 2026 Fixed (24m) V4 · £1,781.35 · exit £50 · 24m15 Oct
West Midlands2,029+£321+£3381,708Fuse Energy · October 2026 Fixed (24m) V4 · £1,690.85 · exit £50 · 24m15 Oct
North Eastern England2,021+£299+£3181,722Fuse Energy · October 2026 Fixed (24m) V4 · £1,703.81 · exit £50 · 24m15 Oct
North Western England2,013+£329+£3461,684Fuse Energy · October 2026 Fixed (24m) V4 · £1,667.30 · exit £50 · 24m15 Oct
Northern Scotland2,006+£290+£3121,717Fuse Energy · October 2026 Fixed (24m) V4 · £1,694.50 · exit £50 · 24m15 Oct
Southern Scotland2,034+£300+£3201,734Fuse Energy · October 2026 Fixed (24m) V4 · £1,714.07 · exit £50 · 24m15 Oct
South Eastern England2,035+£301+£3181,735Fuse Energy · October 2026 Fixed (24m) V4 · £1,717.34 · exit £50 · 24m15 Oct
Southern England2,031+£312+£3291,719Fuse Energy · October 2026 Fixed (24m) V4 · £1,702.20 · exit £50 · 24m15 Oct
Southern Wales2,054+£310+£3321,744Fuse Energy · October 2026 Fixed (24m) V4 · £1,721.68 · exit £50 · 24m15 Oct
South Western England2,043+£297+£3161,746Fuse Energy · October 2026 Fixed (24m) V4 · £1,727.01 · exit £50 · 24m15 Oct
Yorkshire2,033+£308+£3261,724Fuse Energy · October 2026 Fixed (24m) V4 · £1,706.23 · exit £50 · 24m15 Oct
Panel prices: the tariffs our comparison could switch a home to on 15 Oct 2026, as quoted by our tariff feed for each region at 2,500 kWh electricity and 9,500 kWh gas a year, Direct Debit, dual fuel, single-rate meter (electricity without VAT (zero-rated 1 Oct 2026 to 31 Mar 2027); gas including 5% VAT), bills = unit rate x kWh plus 365 days of standing charge per fuel, before sign-up credits; a day with fewer than 10 fixed tariffs falls back to the previous complete day. This tariff: its newest published rates in the same feed, modelled the same way. Cap: Ofgem regional rates, 1 October to 31 December 2026, Direct Debit. 'Cheapest' means cheapest on the EnergyPlus panel, not the whole market; prices change daily and a postcode quote shows the live figure.

So Mongoose 12m on an Economy 7 meter

Economy 7 version in London: 37.23p/kWh by day and 17.08p/kWh in the seven off-peak hours, which are set by your meter and network operator, not by the tariff; standing charge 41.22p a day. It costs less than this tariff's single-rate version (29.92p/kWh, 40.88p a day) once at least 36% of your electricity is used off-peak, modelled at 2,500 kWh a year; at 50% off-peak the Economy 7 version is −£68 a year.

Source: this tariff's newest two-rate and single-rate rows in our tariff feed (snapshot 15 Oct 2026; electricity without VAT (zero-rated 1 Oct 2026 to 31 Mar 2027); Monthly Direct Debit). Modelled from the rates with standing charges included; no off-peak clock times are stored for Economy 7, which depend on your meter.

Dual Fuel, Monthly Direct Debit, standard-rate: regional prices

Unit rates are shown in pence per kWh (p/kWh). Standing charges are shown in pence per day (p/day), calculated from the yearly figures. Use the row that matches your location when you switch.

PES region Elec rate (p/kWh) Elec standing (p/day) Gas rate (p/kWh) Gas standing (p/day) Contract Exit fee (per fuel) Switch
East Midlands 28.621 51.72 10.308 29.49 12 months £75.00 Switch to this tariff
Eastern England 29.767 51.65 10.294 29.49 12 months £75.00 Switch to this tariff
Merseyside & North Wales 30.938 65.53 10.283 29.49 12 months £75.00 Switch to this tariff
North East England 28.694 61.47 10.232 29.49 12 months £75.00 Switch to this tariff
North Scotland 29.192 55.39 10.176 29.49 12 months £75.00 Switch to this tariff
North West England 30.111 47.99 10.294 29.49 12 months £75.00 Switch to this tariff
South East England 29.685 53.15 10.438 29.49 12 months £75.00 Switch to this tariff
South East England 29.924 40.88 10.579 29.49 12 months £75.00 Switch to this tariff
South England 29.306 49.64 10.627 29.49 12 months £75.00 Switch to this tariff
South Scotland 29.244 60.85 10.241 29.49 12 months £75.00 Switch to this tariff
South Wales 29.792 55.53 10.513 29.49 12 months £75.00 Switch to this tariff
South West England 29.439 56.71 10.443 29.49 12 months £75.00 Switch to this tariff
West Midlands 28.940 56.62 10.431 29.49 12 months £75.00 Switch to this tariff
Yorkshire 29.136 60.01 10.291 29.49 12 months £75.00 Switch to this tariff

Dual Fuel, Monthly Direct Debit, Economy 7: regional prices

Unit rates are shown in pence per kWh (p/kWh). Standing charges are shown in pence per day (p/day), calculated from the yearly figures. Use the row that matches your location when you switch.

PES region Elec rate (p/kWh) E7 off-peak (p/kWh) Elec standing (p/day) Gas rate (p/kWh) Gas standing (p/day) Contract Exit fee (per fuel) Switch
East Midlands 37.943 14.294 52.05 10.308 29.49 12 months £75.00 Switch to this tariff
Eastern England 37.838 16.137 51.98 10.294 29.49 12 months £75.00 Switch to this tariff
Merseyside & North Wales 38.131 17.626 65.87 10.283 29.49 12 months £75.00 Switch to this tariff
North East England 33.311 18.723 61.80 10.232 29.49 12 months £75.00 Switch to this tariff
North Scotland 34.467 17.656 55.72 10.176 29.49 12 months £75.00 Switch to this tariff
North West England 35.239 18.689 48.32 10.294 29.49 12 months £75.00 Switch to this tariff
South East England 38.806 15.111 53.48 10.438 29.49 12 months £75.00 Switch to this tariff
South East England 37.231 17.076 41.22 10.579 29.49 12 months £75.00 Switch to this tariff
South England 34.911 18.086 49.97 10.627 29.49 12 months £75.00 Switch to this tariff
South Scotland 33.863 18.357 61.18 10.241 29.49 12 months £75.00 Switch to this tariff
South Wales 33.507 20.075 55.86 10.513 29.49 12 months £75.00 Switch to this tariff
South West England 35.248 17.668 57.04 10.443 29.49 12 months £75.00 Switch to this tariff
West Midlands 35.580 17.224 56.95 10.431 29.49 12 months £75.00 Switch to this tariff
Yorkshire 35.565 17.747 60.34 10.291 29.49 12 months £75.00 Switch to this tariff

Electricity, Monthly Direct Debit, standard-rate: regional prices

Unit rates are shown in pence per kWh (p/kWh). Standing charges are shown in pence per day (p/day), calculated from the yearly figures. Use the row that matches your location when you switch.

PES region Elec rate (p/kWh) Elec standing (p/day) Contract Exit fee (per fuel) Switch
East Midlands 28.621 51.72 12 months £75.00 Switch to this tariff
Eastern England 29.767 51.65 12 months £75.00 Switch to this tariff
Merseyside & North Wales 30.938 65.53 12 months £75.00 Switch to this tariff
North East England 28.694 61.47 12 months £75.00 Switch to this tariff
North Scotland 29.192 55.39 12 months £75.00 Switch to this tariff
North West England 30.111 47.99 12 months £75.00 Switch to this tariff
South East England 29.685 53.15 12 months £75.00 Switch to this tariff
South East England 29.924 40.88 12 months £75.00 Switch to this tariff
South England 29.306 49.64 12 months £75.00 Switch to this tariff
South Scotland 29.244 60.85 12 months £75.00 Switch to this tariff
South Wales 29.792 55.53 12 months £75.00 Switch to this tariff
South West England 29.439 56.71 12 months £75.00 Switch to this tariff
West Midlands 28.940 56.62 12 months £75.00 Switch to this tariff
Yorkshire 29.136 60.01 12 months £75.00 Switch to this tariff

Electricity, Monthly Direct Debit, Economy 7: regional prices

Unit rates are shown in pence per kWh (p/kWh). Standing charges are shown in pence per day (p/day), calculated from the yearly figures. Use the row that matches your location when you switch.

PES region Elec rate (p/kWh) E7 off-peak (p/kWh) Elec standing (p/day) Contract Exit fee (per fuel) Switch
East Midlands 37.943 14.294 52.05 12 months £75.00 Switch to this tariff
Eastern England 37.838 16.137 51.98 12 months £75.00 Switch to this tariff
Merseyside & North Wales 38.131 17.626 65.87 12 months £75.00 Switch to this tariff
North East England 33.311 18.723 61.80 12 months £75.00 Switch to this tariff
North Scotland 34.467 17.656 55.72 12 months £75.00 Switch to this tariff
North West England 35.239 18.689 48.32 12 months £75.00 Switch to this tariff
South East England 38.806 15.111 53.48 12 months £75.00 Switch to this tariff
South East England 37.231 17.076 41.22 12 months £75.00 Switch to this tariff
South England 34.911 18.086 49.97 12 months £75.00 Switch to this tariff
South Scotland 33.863 18.357 61.18 12 months £75.00 Switch to this tariff
South Wales 33.507 20.075 55.86 12 months £75.00 Switch to this tariff
South West England 35.248 17.668 57.04 12 months £75.00 Switch to this tariff
West Midlands 35.580 17.224 56.95 12 months £75.00 Switch to this tariff
Yorkshire 35.565 17.747 60.34 12 months £75.00 Switch to this tariff

Costs, exclusions and common pitfalls to check

Most mistakes happen when the wrong regional or payment-type version of the tariff is compared. Use these checks before switching.

1) Region matters

There are separate regional records because energy pricing differs across PES areas. Do not assume a headline price applies nationally.

2) Payment method affects price

Direct Debit, bill payment and prepayment variants can differ materially. Compare like-for-like only.

3) Economy 7 is usage-sensitive

Economy 7 can help if enough usage is overnight, but can cost more overall if most use is daytime.

4) Fuel bundle changes the comparison

Dual fuel should not be compared directly with electricity-only rows unless you normalise the usage assumptions.

5) Exit fees reduce flexibility

Records shown for this tariff include exit fees of up to £75.00 per fuel. Check the exact regional row before switching.

6) Postcode still beats region-only estimates

Region is useful for guidance, but a postcode-based quote is more precise because it reflects the actual tariff availability and pricing for your home.

Helpful shortcut: if you are not sure this is the right product family, compare all So Energy tariffs before drilling into the regional tables.

So Mongoose 12m: FAQs

Why are there so many records for the same tariff name?

Because the tariff can vary by service type, payment method, Economy 7 status and region. This page groups them together so you can compare them in one place.

Are prices for So Mongoose 12m the same in every region?

No. This page includes region-level records because unit rates and standing charges differ across PES regions. Your postcode is still the best way to confirm what you would actually pay.

Does So Mongoose 12m come with Economy 7?

Yes. At least one Economy 7 option group is currently listed on this page, with separate day and off-peak unit rates shown per region.

Can I get So Mongoose 12m as electricity-only, gas-only or dual fuel?

Current records show these service types: Dual Fuel, Electricity. Availability still depends on your home and supplier rules.

How do I switch to the exact regional option I want?

Use the grouped comparison table to find the right option type, then choose the regional row below it that matches your area and click the switch link.

Can I compare this with other tariffs from the same supplier?

Yes. Visit the So Energy tariffs page to compare other current products from the same supplier.

Will switching affect my supply?

In normal circumstances, no. The switch is administrative and your supply continues while the new tariff is set up.

Trust, methodology and related pages

Page details

Supplier
So Energy
Tariff family
So Mongoose 12m
Regions shown
13
Page type
Canonical tariff family page

How we assess So Mongoose 12m

  • Grouped tariff view: we group records with the same tariff name into one page to avoid duplicate pages and to make comparison easier.
  • Regional realism: we show multiple PES-region records because energy prices vary by area.
  • Like-for-like comparison: we encourage comparison using the same payment method, service type and meter assumptions wherever possible.
  • Rate transparency: we show actual unit rates (p/kWh) and standing charges (p/day) so you can estimate costs using your own usage figures.
  • Availability caveat: the exact tariff you can join may still depend on your postcode and supplier eligibility checks.

Explore more from So Energy

We recommend checking the supplier's tariff information and product terms before you switch, as regional availability and rates can change quickly.

Ready to compare So Mongoose 12m with the market?

Get estimated prices using your postcode and meter details, then choose the exact regional tariff option that matches your home.

Get your energy quote See all So Energy tariffs


Updated on 15 Oct 2026