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EDF SEG Export Variable Value is a variable export tariff for households and eligible generators that buy their imported electricity from EDF. The tariff currently pays 5.6 pence per kilowatt hour for qualifying renewable electricity exported to the grid. The rate can change, but there is no fixed contract end date and no exit fee. It supports a wider range of renewable technologies than EDF's premium fixed export tariffs. This makes it relevant to some owners of wind, hydro, anaerobic digestion and micro combined heat and power installations, as well as solar households. This guide was checked on 11 July 2026.
Renewable generation is normally used within the property first. Any electricity that is not immediately consumed or stored can pass through an export meter into the local distribution network. EDF pays for the eligible electricity recorded by that export meter. At the current rate of 5.6 pence per kilowatt hour, exporting 1,000 kilowatt hours would produce £56. A household exporting 2,500 kilowatt hours would receive £140. An installation exporting 5,000 kilowatt hours would receive £280. These figures describe export income only. They do not include the value of renewable electricity used inside the property, which may avoid buying energy at a much higher import price.
The 5.6 pence rate is not fixed for a twelve month period. EDF can increase or reduce it in response to market conditions or changes in its export tariff structure. EDF states that it will provide advance written notice before changing the rate. Its current tariff information says customers should receive at least five days' notice, giving them an opportunity to review alternatives or transfer their export supply. The current 5.6 pence rate has applied since 22 July 2022, but its long history does not turn it into a guaranteed fixed price. EDF retains the contractual right to revise it.
Export Variable Value is reserved for customers whose imported electricity is supplied by EDF. The import tariff and export tariff remain separate agreements. The household might buy electricity through EDF Standard Variable, Simply Fixed, Simply Tracker, GoElectric, FreePhase or another compatible EDF product while receiving Export Variable Value payments for renewable electricity sent to the grid. If the customer moves their imported electricity to another supplier, EDF can transfer the export account from Export Variable Value to the lower paying SEG Export Variable tariff. EDF must notify the customer if this happens. The reverse can also apply. Someone on Export Variable with another import supplier can tell EDF after moving their electricity supply to EDF and request transfer to Export Variable Value. This relationship should be included when comparing suppliers. A higher export payment may not compensate for a more expensive import arrangement, while a lower export payment may be acceptable if the household has an especially valuable import tariff elsewhere.
Export Variable Value covers several recognised renewable and low carbon generation technologies: Solar photovoltaic panels Onshore wind turbines Hydroelectric generation Anaerobic digestion Qualifying micro combined heat and power The installed generation capacity can be up to 5 megawatts. Micro combined heat and power is subject to a lower maximum of 50 kilowatts. EDF does not make payments under this tariff for capacity above the relevant limit. This is broader than EDF Export 12m and Export Exclusive 12m V3, which are presented as solar export products and apply a 50 kilowatt limit. Export Variable Value may therefore be relevant to a larger renewable installation or a household using an eligible technology other than solar.
The property needs an export meter capable of recording electricity in half hourly intervals. EDF prefers the meter to send readings automatically. Where automatic readings are not available, the customer must provide actual export readings every quarter, or sooner when EDF requests them. The export register is different from the ordinary import register. The import reading measures electricity taken from the grid, while the export reading measures electricity sent in the opposite direction. Customers submitting manual readings should keep dated photographs of the meter display and retain their readings for at least twelve months. EDF's terms require the customer to keep a record of information submitted for payment.
An export Meter Point Administration Number is required. This is usually called an export MPAN. The export MPAN separately identifies the electricity leaving the property. If the installation does not already have one, EDF can register it on the customer's behalf. Payments do not begin merely because an application has been submitted. The agreement starts when the export MPAN has been registered with EDF and the commencement date has been confirmed in the customer's tariff term sheet. Electricity exported before the confirmed commencement date may not receive payment under the agreement. Applicants should retain their approval, opening meter reading and confirmation of the export start date.
EDF's current application information asks customers to prepare: An MCS certificate or an alternative accreditation accepted by EDF A distribution network operator letter Proof that they own the generation installation A copy of an electricity bill when EDF does not supply the import account Contact and bank information A photograph of the export meter reading The MCS or equivalent certificate demonstrates that the installation followed an accepted certification process. The distribution network operator letter confirms that the system has been notified to, or approved by, the organisation responsible for the local electricity network.
EDF sends reading reminders where automatic export data is unavailable. After the opening reading, manual readings are normally requested quarterly. EDF's public tariff page says it aims to make payment by bank transfer within 28 days of receiving the export reading. The formal contract allows payment within 90 calendar days following the end of the relevant meter reading month, once EDF has received and validated the reading. The contractual period should therefore be used when planning cash flow, even though EDF may usually process payments sooner. EDF can withhold payments when the customer fails to provide two consecutive valid readings. The earnings may continue accumulating, but they can remain unpaid until a valid reading is supplied.
A customer cannot receive SEG payments from two suppliers for the same exported electricity. The installation must also not receive a Feed in Tariff export payment while participating in the EDF SEG arrangement. EDF's public guidance says an existing Feed in Tariff customer can opt out of the export element and move to SEG. However, the customer cannot opt back into the Feed in Tariff export arrangement for twelve months and cannot return to deemed export payments. Future export would be paid using measured readings. Anyone receiving historic Feed in Tariff payments should ask EDF and the existing Feed in Tariff licensee to confirm the effect in writing before changing anything. A deemed export arrangement can be valuable when the household uses much of its renewable generation internally. Moving to measured export means payment depends on the electricity that genuinely crosses the export meter.
Battery storage can be used with the tariff when it is linked to an eligible renewable installation. Solar electricity stored in a battery and exported later may qualify. Electricity imported from the grid, stored and then exported should not automatically be treated as eligible renewable generation. EDF's terms allow it to determine what proportion of a meter reading qualifies where the export may include electricity from batteries, generators or another ineligible source. EDF can also question an export reading that appears higher than the amount the registered renewable system could reasonably generate. The current public guidance says there is no set limit on the energy exported, but it cannot exceed the renewable energy available from the installation.
EDF Export 12m currently pays 15 pence per kilowatt hour, compared with 5.6 pence on Export Variable Value. For 2,500 kilowatt hours of annual export: Export Variable Value would pay £140. Export 12m would pay £375. The difference would be £235. Export 12m is therefore financially stronger for an eligible residential EDF customer with a qualifying solar installation. However, it is fixed for twelve months, has narrower technology and capacity conditions, and may not be available to every generator supported by Export Variable Value. Export Variable Value may also become the continuing arrangement after another EDF export offer ends, depending on the customer's renewal options and current terms.
There is no cancellation fee. Once the agreement has started, the customer can end it by providing 28 days' written notice. Residential customers also receive a 14 day cancellation period under the tariff conditions. A closing export reading should be supplied when the agreement ends or ownership of the installation changes. When moving home, the outgoing owner should record the export meter on the day they leave. The new owner does not automatically inherit the previous SEG agreement and must make a new application.
Export Variable Value may suit an EDF electricity customer who wants a flexible export arrangement without a fixed end date. It is particularly relevant to eligible wind, hydro, anaerobic digestion and micro combined heat and power installations that do not qualify for EDF's solar focused fixed export products. It may also suit larger systems that exceed the 50 kilowatt limit of the fixed tariffs but remain within the broader SEG capacity rules. For an ordinary domestic solar customer, the 5.6 pence rate should be compared carefully with EDF Export 12m and other suppliers' export products. The correct comparison includes the import tariff, standing charges, annual import consumption, expected measured export and the value of using renewable electricity inside the property. Export Variable Value offers flexibility and broad technology eligibility, but its current payment is considerably below EDF's fixed residential solar export rates. Its strongest role is where the customer needs the broader eligibility or does not qualify for a higher fixed product.
The Octary EDF comparison page should calculate which EDF tariff, or combination of EDF import and export products, is likely to suit a particular household. It should not rank tariffs by the cheapest advertised unit rate alone. A rate of 6.49 pence per kilowatt hour may look excellent, but it is available only during a defined overnight period and is tied to a two year charger package. A FreePhase tariff may provide cheap or free electricity at certain times, but it can become expensive for a home that uses most of its electricity between 4pm and 7pm. A solar export rate of 18 pence per kilowatt hour may appear attractive, but access depends on how the equipment was purchased, the installation documents and EDF supplying the property. The system must consider: 1. The customer's postcode and electricity region 2. Annual electricity and gas consumption 3. Half hourly electricity use 4. Number of adults and children 5. Property type, floor area and insulation 6. Heating and hot water systems 7. Number of electric vehicles 8. Battery capacity and mileage of every vehicle 9. Home charger power and compatibility 10. Solar generation and orientation 11. Home battery capacity and efficiency 12. Electricity import and export timing 13. Existing tariff and exit charges 14. Smart meter type and communication status 15. Preference for fixed, variable or dynamic pricing 16. Ability to shift electricity away from peak periods 17. Eligibility for EDF equipment related tariffs The final result should explain the recommendation in ordinary language, not merely produce a table of prices.
The completed EDF article series covers 15 entries. Fourteen are supply or export tariffs. The fifteenth is a standing charge trial applied through FreePhase.
1. EDF Standard Variable 2. EDF Simply Tracker 3. EDF Simply Fixed 4. EDF FreePhase Dynamic 5. EDF FreePhase Static 6. EDF GoElectric 7. EDF Pod Point Plug and Power 8. EDF Heat Pump Tracker 9. EDF Empower Fixed Exclusive 12m 10. EDF Empower Fixed
11. EDF FreePhase Low Standing Charge Trial
12. EDF Export Exclusive 12m V3 13. EDF Export 12m 14. EDF SEG Export Variable Value 15. EDF SEG Export Variable
EDF Smart Charging is not a complete electricity tariff. It is a charging service that can be added to GoElectric or certain single rate tariffs. It can provide a £5 monthly credit and additional managed off peak periods. It must therefore be handled as an optional tariff modifier rather than ranked as a separate supply tariff. Sunday Saver should also be stored as a possible reward programme rather than a tariff. FreePhase customers cannot currently participate because FreePhase already uses three electricity rates.
From 1 July to 30 September 2026, the average capped Direct Debit rates across England, Scotland and Wales are: ----------------------------------------------------------------------- Charge National average --------------------------------------- ------------------------------- Electricity unit rate 26.11 pence per kWh Electricity standing charge 57.19 pence per day Gas unit rate 7.33 pence per kWh Gas standing charge 29.04 pence per day ----------------------------------------------------------------------- These are national reference figures, not exact EDF prices for every home. Regional distribution costs, payment method and meter configuration can change the rates quoted to an individual customer. The comparison system should never calculate a household bill from the national price cap headline alone. It should use the customer's actual regional tariff prices and consumption.
Every EDF entry should be assigned one of the following system types: ----------------------------------------------------------------------- Classification Meaning --------------------- ------------------------------------------------- Standard variable Rates change with the Ofgem price cap Fixed Unit rates remain fixed for a stated term Cap tracker Rates change quarterly with the price cap Static time of use Fixed rates vary by daily time band Dynamic time of use Rates are recalculated using market prices Technology tariff Requires an EV, heat pump, solar or battery Export tariff Pays for eligible electricity sent to the grid Tariff modifier Adds a discount or service to another tariff Equipment bundle Combines energy supply with physical equipment ----------------------------------------------------------------------- This classification prevents incorrect comparisons. For example, EDF Export 12m should not be ranked against GoElectric as though they were alternatives. A household may use GoElectric for import and a compatible EDF product for export.
------------------------------------------------------------------------- EDF product Main pricing Term Main eligibility feature --------------- ----------------------- ----------- --------------------- Standard Regional capped rates Open ended Standard domestic Variable supply Simply Tracker Price cap rates with Fixed end Eligible EDF account standing charge date discount Simply Fixed Fixed regional unit Depends on Standard domestic rates offer supply FreePhase Three rates Fixed term Half hourly smart Dynamic recalculated daily meter FreePhase Three fixed daily rates Usually 12 Half hourly smart Static months meter Low Standing £6.25 monthly discount One year Eligible lower use Charge Trial per fuel FreePhase customer GoElectric 6.99p overnight from One year EV and connected 11pm to 6am fixed smart meter Plug and Power 6.49p overnight plus Two years EV, smart meter and Pod charger fixed installation eligibility Heat Pump 10p discount during six Flexible Installed heat pump Tracker daily hours and smart meter Empower Fixed Overnight discount and 12 months Qualifying EDF or Exclusive no standing charge Contact Solar purchase Empower Fixed Overnight battery Fixed Existing solar or charging discount battery Export 18p export rate 12 months Qualifying EDF or Exclusive 12m Contact Solar V3 purchase Export 12m 15p export rate 12 months EDF import customer SEG Export 5.6p export rate Variable EDF import customer Variable Value SEG Export 3p export rate Variable Any import supplier Variable -------------------------------------------------------------------------
Type: Standard variable electricity and gas tariff Price structure: Regional unit rates and standing charges based on the Ofgem price cap. Price changes: Normally every January, April, July and October. Exit fee: None. Smart meter required: No, although accurate smart data improves the comparison.
EDF confirms that its Standard Variable rates are based on the price cap and can change every three months.
Annual electricity cost = electricity kWh × regional unit rate + 365 × electricity standing charge Annual gas cost = gas kWh × regional gas rate + 365 × gas standing charge
Type: Price cap linked fixed term tariff. Despite its name, Simply Tracker does not track daily wholesale prices. It follows EDF Standard Variable pricing when the Ofgem price cap changes.
The discount is the same across regions and payment methods. Unit rates are not guaranteed to be lower than Standard Variable. The stated saving is delivered through the standing charge. Price changes: Quarterly. Exit fee: Applies. The live quotation must supply the exact amount.
- Low consumption homes where standing charges form a larger part of the bill
Tracker standing charge = regional Standard standing charge − 6.85p per day The system should not reduce the unit rate unless EDF's live tariff record explicitly shows a unit rate difference.
Type: Conventional fixed electricity and gas tariff. EDF may offer several Simply Fixed versions with different contract lengths, prices and exit fees. The system should therefore treat Simply Fixed as a tariff family rather than one permanent product.
Exact rates, end dates and exit fees should be retrieved from EDF's live quotation or Tariff Information Label service.
- Customers unlikely to require a specialist tariff during the fixed term
First year cost = annual tariff cost + current supplier exit fee + joining costs
Effective saving = expected saving − EDF exit fee − any lost rewards
Type: Dynamic three rate electricity tariff.
----------------------------------------------------------------------- Period Time ------------- --------------------------------------------------------- Green 11pm to 6am Amber 6am to 4pm and 7pm to 11pm Red 4pm to 7pm ----------------------------------------------------------------------- The three prices can change daily according to the day ahead wholesale electricity market. EDF calculates the rates using Nord Pool market prices, a regional coefficient, a peak premium for the red period and a government cost adjustment. The Dynamic unit price cannot exceed 75 pence per kilowatt hour during the twelve month maximum price guarantee. Standing charge: Tracks the regional Standard Variable standing charge plus a FreePhase service fee. The service fee is currently zero, but the standing charge can change quarterly. Exit fee: None. Return restriction: A customer leaving FreePhase may be unable to rejoin a FreePhase product for nine months.
Free electricity: Qualifying Dynamic periods are charged at zero pence. Free periods depend on market conditions and are not guaranteed. EDF reports that customers received 238 hours of free electricity between 3 June 2025 and 17 June 2026.
The system must retrieve every daily green, amber and red price and match it to consumption during the corresponding time band. Annual cost = Σ green consumption × daily green rate + Σ amber consumption × daily amber rate + Σ red consumption × daily red rate + standing charges Using today's Dynamic price for an entire year would be misleading.
Type: Fixed three rate electricity tariff. It uses the same time periods as Dynamic: The difference is that the quoted unit rates remain fixed for the tariff term rather than changing daily. Exact rates: Regional and quotation dependent. Exit fee: None. Return restriction: A customer leaving may be unable to rejoin FreePhase for nine months. Free electricity: EDF credits qualifying Static consumption back to the account rather than setting the original rate to zero.
- The tariff may perform poorly for households with unavoidable evening consumption
Cost = green kWh × green rate + amber kWh × amber rate + red kWh × red rate + annual standing charge
Type: Standing charge discount applied to an eligible FreePhase tariff. This should not be stored as a complete independent electricity tariff.
Duration: One year. Target customer: Lower energy users. Exit fee: None. EDF has not published one universal annual consumption threshold on its public trial announcement. The engine should therefore obtain eligibility from EDF rather than inventing a threshold.
FreePhase annual cost after trial = FreePhase annual cost − qualifying monthly discounts The result must still include all red, amber and green consumption. A standing charge saving does not automatically make FreePhase suitable for a household with heavy red period use.
Type: Fixed two rate EV electricity tariff. Off peak rate: 6.99 pence per kilowatt hour. Off peak period: 11pm to 6am. Length: Seven hours every night. Whole home pricing: All electricity used during the overnight period receives the off peak rate. Term: Fixed. Exit fee: £75.
GoElectric works with any make of EV or charger because ordinary tariff operation does not require EDF to control the vehicle. EDF suggests that at least 6 per cent of household electricity should fall inside the off peak period for the tariff to be worth considering. Its existing GoElectric customers use an average of 43 per cent during off peak hours. These figures should be treated as guidance rather than a universal break even point.
At a 7 kW charger: 7 kW × 7 hours = 49 kWh from the grid At 90 per cent charging efficiency: 49 kWh × 0.90 = 44.1 kWh stored in the vehicle
Type: Two year fixed EV tariff and charger bundle. Off peak rate: 6.49 pence per kilowatt hour. Off peak period: 11pm to 6am. Charger: Pod Solo 3S from £499 upfront. Standard installation: Included for qualifying properties. Warranty: Five years for the charger and qualifying installation. Term: Two years.
EDF states that about 90 per cent of applicants qualify for standard installation. Extra work may increase the charger cost.
1. EDF tariff exit charge 2. Possible repayment of part of the reduced charger price The charger related charge is applied proportionally according to the term remaining. Moving home during the two year term can also trigger this cost.
The system must separate the charger purchase from the electricity cost. Two year package cost = upfront charger cost + extra installation cost + two years of electricity costs The comparison should then measure this against: Separate charger purchase + alternative electricity tariff
Type: Flexible time based heat pump tariff.
Total discounted time: Six hours a day. Discount: 10 pence per kilowatt hour below the regional EDF Standard Variable electricity rate. Other hours: Regional Standard Variable rate. Standing charge: Regional Standard Variable standing charge. Peak premium: None. Price changes: Quarterly with the price cap, but the 10 pence discount remains. Exit fee: None.
- Households needing normal priced evening electricity rather than an expensive peak
- The discount may be less valuable where solar already covers afternoon demand - An EV tariff may be better where vehicle charging dominates consumption
Annual saving against EDF Standard = discounted period consumption × £0.10 For example: 1,600 kWh × £0.10 = £160
Type: Solar and battery related fixed import tariff. Eligibility: A qualifying purchase of solar panels, battery storage or both through EDF or Contact Solar.
EDF markets the tariff with its Export Exclusive product and states that a representative solar and battery household could potentially reach a zero net electricity bill during the first year. This is an illustration based on specific assumptions, not a guarantee.
The equipment purchase and energy tariff must be modelled separately. Net first year energy cost = import charges − export income Total first year household investment = equipment cost + net energy cost
Type: Fixed import tariff for existing solar or battery homes. Eligibility: Existing solar panels, home battery or both. The equipment does not need to have been purchased from EDF.
EDF distinguishes this tariff from the Exclusive version, which adds a zero standing charge and requires a qualifying EDF or Contact Solar purchase.
Type: Fixed solar export tariff. Export rate: 18 pence per kilowatt hour. Term: 12 months. Exit fee: None.
- Qualifying solar, battery or combined purchase through EDF or Contact Solar The enquiry and purchase must meet EDF's current qualifying date and product terms. The system should store the eligibility date as a configurable field because EDF may change it.
----------------------------------------------------------------------- Annual export Income at 18p ----------------------------------- ----------------------------------- 1,000 kWh £180 2,500 kWh £450 4,000 kWh £720 -----------------------------------------------------------------------
- A high export rate should not encourage uneconomic import replacement
Type: Fixed export tariff. Export rate: 15 pence per kilowatt hour. Term: One year. Exit fee: None.
EDF presents this as the fixed export option for existing residential EDF electricity customers who do not qualify for the exclusive 18 pence product.
----------------------------------------------------------------------- Annual export Income at 15p ----------------------------------- ----------------------------------- 1,000 kWh £150 2,500 kWh £375 4,000 kWh £600 ----------------------------------------------------------------------- Important rule: If the customer moves their import electricity away from EDF, access to this product may end or the account may move to an appropriate variable export tariff.
Type: Variable export tariff for EDF import customers. Current export rate: 5.6 pence per kilowatt hour. Exit fee: None.
Capacity: Up to 5 MW, with micro CHP limited to 50 kW.
- EDF import customers not eligible for the 15p or 18p fixed solar products Main disadvantage: Considerably lower rate than EDF's fixed residential solar export tariffs.
Type: Variable export tariff open regardless of import supplier. Current export rate: 3 pence per kilowatt hour. Exit fee: None. Main benefit: The customer can keep an import tariff with another supplier.
Main disadvantage: Lowest EDF export payment in the current domestic range.
EDF Smart Charging should be modelled separately from GoElectric.
EDF controls the vehicle charging schedule. A Boost Charge can be used when immediate electricity is required, but it may be charged at the ordinary rate. Existing schedules in the car, charger or another application must normally be disabled.
Smart Charging adjusted cost = base tariff cost − qualifying £5 monthly credits − savings from managed off peak periods The engine should not assume twelve credits automatically. It should ask whether the customer expects to remain enrolled and use managed charging regularly.
The comparison must evaluate valid packages. Examples include: The system should not assume that the highest export tariff creates the lowest total household cost. A household may earn more from EDF export while paying considerably more for imported electricity. The calculation must always combine import charges, gas charges, standing charges, equipment costs and export credits.
The questionnaire should use progressive stages so ordinary users are not presented with every technical field at once.
----------------------------------------------------------------------- Variable Purpose ----------------------------- ----------------------------------------- Postcode Determines electricity region and quotation Electricity region Selects regional rates Current supplier Establishes switching and SEG eligibility Current tariff Baseline comparison Contract end date Determines switching timing Current exit fee Included in first year result Electricity only or dual fuel Determines products to compare Payment method Affects prices and eligibility Smart meter installed Required for smart tariffs Smart meter communicating More important than physical presence Half hourly data consent Required for time based products Single phase or three phase FreePhase compatibility Standard or Economy 7 meter Determines current baseline Export MPAN present Required for export products -----------------------------------------------------------------------
----------------------------------------------------------------------- Variable Purpose --------------------------- ------------------------------------------- Number of adults Base electricity and hot water estimate Number of children Laundry, hot water and evening demand Bedrooms Useful when bills are unavailable Floor area Heating demand Property type Heat loss estimate Property age Construction efficiency EPC rating Heating and energy demand Insulation level Determines ability to shift heat People working from home Daytime electricity Days occupied each week Standing charge and consumption profile Typical wake time Heating and EV schedules Typical bedtime Overnight flexibility Cooking fuel Evening electricity demand Peak avoidance ability FreePhase suitability Price certainty preference Fixed versus dynamic scoring Automation willingness Dynamic and managed charging suitability -----------------------------------------------------------------------
Use the strongest data source available: 1. Twelve months of half hourly smart meter data 2. Twelve months of monthly bills 3. Annual consumption from a bill 4. Meter readings covering a known period 5. Household estimate Required values should include: ----------------------------------------------------------------------- Variable Unit ------------------------------------------------------------ ---------- Annual electricity kWh Annual gas kWh Electricity from 11pm to 6am kWh Electricity from 4pm to 7pm kWh Electricity from 4am to 7am kWh Electricity from 1pm to 4pm kWh Electricity from 1am to 4am kWh Monthly electricity kWh Monthly gas kWh Half hourly electricity kWh ----------------------------------------------------------------------- The engine should assign a confidence grade:
The EV section must support multiple vehicles. For each vehicle, collect: ----------------------------------------------------------------------- Variable Unit or type --------------------------------------------- ------------------------- Make and model Text Battery electric or plug in hybrid Choice Total battery capacity kWh Usable battery capacity kWh Annual mileage Miles Average efficiency Miles per kWh Home charging proportion Percentage Workplace charging proportion Percentage Public charging proportion Percentage Charging efficiency Percentage Charger power kW Typical arrival state of charge Percentage Required departure state of charge Percentage Plug in time Time Departure time Time Charging days each week Integer Immediate charges per month Integer EDF Smart Charging compatibility Yes, no or unknown Charger required Yes or no Off street parking Yes or no Likelihood of moving within two years Percentage or choice -----------------------------------------------------------------------
Annual home EV energy = annual mileage ÷ vehicle efficiency ÷ charging efficiency × home charging proportion Example: 12,000 ÷ 3.5 ÷ 0.90 × 0.80 = 3,048 kWh
Required grid energy = usable battery capacity × state of charge increase ÷ charging efficiency Charging time = required grid energy ÷ charger power The result should determine whether the charge fits within:
----------------------------------------------------------------------- Variable Unit or choice -------------------------- -------------------------------------------- Main heating Gas, heat pump, direct electric, storage heating, oil or other Heat pump type Air source or ground source Annual heat pump kWh electricity Seasonal performance Number factor Useful annual heat demand kWh Hot water system Heat pump, gas, immersion or direct electric Cylinder size Litres Immersion power kW Heating demand from 4pm to kWh 7pm Ability to preheat Low, medium or high Minimum indoor temperature Degrees Celsius Thermal mass Low, medium or high Smart thermostat present Yes or no Weather compensation Yes or no enabled -----------------------------------------------------------------------
Heat pump electricity = useful heat demand ÷ seasonal performance factor Example: 12,000 kWh ÷ 3.2 = 3,750 kWh electricity This demand should then be divided between the two Heat Pump Tracker discounted periods and the remaining day.
----------------------------------------------------------------------- Variable Unit or choice -------------------------------------------- -------------------------- Solar installed Yes or no Array capacity kWp Annual generation kWh Generation by month kWh Roof direction Compass direction Roof angle Degrees Shading Low, medium or high Current self consumption Percentage Current export kWh MCS or accepted certificate Yes or no Distribution network approval G98, G99 or other Export MPAN Yes or no Feed in Tariff Yes or no FIT export type Deemed or metered Existing export rate Pence per kWh Equipment purchased through EDF Yes or no EDF enquiry or purchase date Date Contact Solar installation Yes or no ----------------------------------------------------------------------- The purchase and installation fields are essential for determining whether the household qualifies for Empower Fixed Exclusive and Export Exclusive 12m V3.
----------------------------------------------------------------------- Variable Unit or choice --------------------------------------- ------------------------------- Battery make and model Text Total capacity kWh Usable capacity kWh Maximum charge power kW Maximum discharge power kW Round trip efficiency Percentage Minimum reserve Percentage Backup reserve Percentage Maximum export power kW DNO export limit kW Grid charging allowed Yes or no Grid export allowed Yes or no Solar charging allowed Yes or no Programmable schedule Yes or no Warranty cycles Integer Warranty throughput MWh Estimated degradation cost Pence per cycled kWh -----------------------------------------------------------------------
Returned energy = charged energy × round trip efficiency A battery charged with 10 kWh at 90 per cent efficiency may return about 9 kWh. The tariff engine should include losses before claiming savings from overnight charging.
Users should be able to add loads such as: ----------------------------------------------------------------------- Appliance Required inputs ----------------------------- ----------------------------------------- Washing machine Cycles, kWh and allowed hours Tumble dryer Cycles, kWh and allowed hours Dishwasher Cycles, kWh and allowed hours Immersion heater Power and duration Pool heat pump Power and available schedule Hot tub Daily use and thermal flexibility Dehumidifier Power and hours Electric shower Power and duration Direct electric heating Power and required periods Air conditioning Seasonal use Home battery Charge power and schedule EV charger Power and availability ----------------------------------------------------------------------- This information helps determine whether FreePhase, GoElectric or Heat Pump Tracker creates genuine value.
Annual cost = annual consumption × unit rate + 365 × standing charge
Net supply cost = electricity cost + gas cost
Consumption should be divided across the applicable price cap periods. Tracker cost = Σ consumption in quarter × quarter rate + quarter standing charges
Cost = Σ consumption in each period × corresponding fixed rate + standing charge
Cost = Σ consumption in each band on each date × that date's band rate + standing charges
Cost = overnight kWh × overnight rate + remaining kWh × daytime rate + standing charge
Cost = discounted period kWh × discounted regional rate + other kWh × Standard regional rate + standing charge
Export income = Σ eligible exported kWh × export rate
Net cost = electricity import + gas + standing charges + subscriptions + equipment related costs + exit fees − export income − rewards
Include:
Exclude one time charges and show a normal twelve month operating year.
The engine must compare self consumption with export. For each solar unit: Value of self consumption = avoided import rate Value of export = applicable export rate If the household avoids buying electricity at 30 pence by using one solar unit, that may be more valuable than exporting it for 15 or 18 pence. Battery export should include: The engine must not assume that grid charged battery electricity qualifies for SEG payment.
Each tariff should receive one of these statuses: 1. Eligible 2. Likely eligible, further checks required 3. Not eligible 4. Currently unavailable 5. Live quotation required ----------------------------------------------------------------------- Tariff Main eligibility test --------------------- ------------------------------------------------- Standard Variable Domestic EDF supply Simply Tracker Eligible account and accepted contract Simply Fixed Product available for postcode FreePhase Dynamic Half hourly smart meter, Direct Debit, non three phase FreePhase Static Half hourly smart meter, Direct Debit, non three phase Low Standing Charge Eligible lower use FreePhase customer Trial GoElectric EV and connected smart meter Plug and Power EV, connected meter and charger installation eligibility Heat Pump Tracker Installed heat pump and half hourly meter Empower Fixed Qualifying EDF or Contact Solar purchase Exclusive Empower Fixed Existing solar or battery Export Exclusive Qualifying purchase, solar, EDF import and export documents Export 12m EDF import, solar and export documents Variable Value EDF import and eligible generation Export Variable Eligible generation with any import supplier Smart Charging Compatible car or charger and eligible base tariff ----------------------------------------------------------------------- Eligibility must be established before ranking by price.
Suggested price risk levels: --------------------------------------------------------------------------- Risk Tariff type ---------- ---------------------------------------------------------------- 1 Fixed single rate 2 Fixed time of use 3 Price cap tracker 4 Dynamic daily pricing 5 Dynamic tariff with high unavoidable peak exposure --------------------------------------------------------------------------- The result should also include separate scores for:
Suggested default weighting: ----------------------------------------------------------------------- Category Weight ------------------------------------------------------- --------------- Predicted annual cost 40 per cent Eligibility and compatibility 20 per cent Ability to meet heating and charging needs 15 per cent Price and contract risk 10 per cent Customer effort 5 per cent Switching flexibility 5 per cent Environmental flexibility 5 per cent ----------------------------------------------------------------------- The user should be able to adjust these priorities. A customer who values certainty may increase risk weighting. A battery owner using automation may reduce the importance of effort.
The result should explain why the recommendation fits the household.
Your household charges two electric vehicles at home and expects to use approximately 5,600 kWh a year for vehicle charging. Both cars are usually connected before 11pm, and your charger can place most of this demand inside GoElectric's seven hour overnight window. Your home also uses around 1,100 kWh each year for appliances and battery charging between 11pm and 6am. This electricity would receive the same 6.99 pence overnight rate. You already have solar panels installed by another company, so you do not qualify for EDF Export Exclusive. You may qualify for EDF Export 12m at 15 pence per kilowatt hour because EDF would supply your imported electricity. Estimated annual import cost: £X\ Estimated export income: £Y\ Estimated net cost: £Z\ Saving against current tariff: £A\ Price certainty: High\ Result confidence: High\ Main disadvantage: £75 GoElectric exit fee
- FreePhase Dynamic was rejected because much of your unavoidable electricity use occurs from 4pm to 7pm. - Heat Pump Tracker was rejected because EV demand is considerably larger than your heat pump's shiftable demand. - Empower Fixed was rejected because its three hour overnight period cannot accommodate both vehicles and the home battery. - Simply Fixed was more predictable but had a higher estimated annual cost.
Display:
The best overall package.
Lowest central annual estimate.
Best fixed or capped arrangement.
Based on all vehicles, charger capacity and home charging.
Based on heating demand, thermal flexibility and smart controls.
Based on self consumption, import shifting and export income.
Include Simply Tracker and the FreePhase Low Standing Charge Trial where eligible. For every option, show: 1. Annual electricity import cost 2. Annual gas cost 3. Standing charges 4. EV charging cost 5. Heat pump cost 6. Export income 7. Equipment or subscription costs 8. Exit fees 9. Net annual cost 10. Monthly equivalent 11. Saving against current tariff 12. Eligibility status 13. Risk score 14. Effort score 15. Confidence grade 16. Main advantage 17. Main disadvantage
EDF publishes residential tariff information through open tariff APIs, its Tariff Information Label service and dedicated price pages. EDF states that its open APIs are intended to allow apps, chargers, batteries and energy management systems to respond to live tariff prices. The system should retrieve or store: ----------------------------------------------------------------------- Field Purpose ---------------------- ------------------------------------------------ Supplier EDF Product name Human readable tariff Product version Distinguishes successive offers Electricity region Selects correct rates Fuel Electricity or gas Direction Import or export Payment method Direct Debit, cash or prepayment Meter type Standard, multi rate or smart Rate type Flat, green, amber, red, day, night or dynamic Unit rate Pence per kWh Standing charge Pence per day Export rate Pence per kWh Exit fee Pounds Contract start Date Contract end Date Valid from Date and time Valid to Date and time Eligibility conditions Structured rules Availability Open, trial, restricted or closed Retrieved at Audit timestamp Source EDF API, TIL or official page -----------------------------------------------------------------------
Recommended refresh schedule: ----------------------------------------------------------------------- Data Refresh frequency ----------------------------- ----------------------------------------- Standard Variable rates Daily check, update when changed Simply Tracker Daily availability check Simply Fixed offers Daily FreePhase Dynamic prices At least once after publication each day FreePhase coefficients Daily check, version on change FreePhase Static quotations Daily EV tariff rates Daily Heat Pump Tracker Daily regional check Export rates Daily Eligibility wording Weekly Product availability Daily Ofgem cap reference On each official announcement ----------------------------------------------------------------------- Every stored rate must retain its effective date. Old rates are required for historical tariff simulations.
FreePhase Dynamic should be shown using at least three scenarios:
Uses a lower historical percentile of consumption weighted prices.
Uses the household's consumption profile against a representative historical period.
Uses a higher price period or stress case. The results must state that future wholesale prices cannot be guaranteed. The comparison should show:
The best EDF tariff depends on the shape of the household's electricity use. Two households can consume the same annual electricity but require completely different tariffs. One may have two EVs and benefit most from GoElectric. Another may have a heat pump and gain more from the two daily Heat Pump Tracker discounts. A solar and battery home purchasing equipment through EDF may qualify for the Exclusive import and export package. An existing solar owner may be better suited to Empower Fixed and Export 12m. A flexible battery household may use FreePhase Dynamic effectively, while a family with heavy evening demand may pay more on the same tariff. A low consumption home may value reduced standing charges more than a low overnight rate. The Octary comparison system should therefore perform four tasks in order: 1. Confirm tariff eligibility 2. Calculate household specific cost 3. Assess risk and practical suitability 4. Explain the result in understandable language The cheapest advertised rate is not necessarily the cheapest household tariff. The correct answer comes from modelling the property, occupants, vehicles, heating, solar generation, battery storage and timing of energy use together.
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