Homeowner Blog

Smart Export Guarantee Tariffs: Which is the Best Rate?

George Riley · 10 Feb 2021

The Smart Export Guarantee (SEG) has now been in effect for over a year, since it came into law on January 1st 2020. It’s the mechanism to ensure solar PV owners are paid for the power they send to the grid, ending the policy void that existed since the Feed-in Tariff closed to new applicants in March 2019.

According to the SEG, energy suppliers with over 150,000 customers must offer an export tariff with a rate greater than zero. The SEG is available for customers with an MCS-certified renewable energy system under 5MW and a second generation smart meter.

With zero as the minimum, at the very least you can’t be charged for being relieved of excess solar power. However, suppliers don’t have to give you very much for it. So how much are they offering in practice?

SEG tariffs on offer

Supplier

Tariff

Rate paid per kWh

Octopus

Tesla Energy Plan

10-12p

Social Energy

SEG Tariff

6p

Bulb

Export Payments for import customers

5.57p

Export Payments for non-import customers

3p

Octopus

Outgoing Fixed

5.5p

Outgoing Agile

Variable tracking day-ahead wholesale price

E.ON

Fix & Export Exclusive

5.5p

Fix & Export

3p

OVO

OVO SEG Tariff

4p

ScottishPower

Smart Export Variable Tariff

4p

SSE

Smart Export Tariff

3.5p

Shell Energy

SEG Tariff

3.5p

British Gas

Export & Earn Flex

3.2p

Utility Warehouse

UW Smart Export Guarantee

2p

EDF

Export+Earn

1.5p

Rates correct as of the date of publication. Please see Solar Energy UK’s league table for more details.

There are encouraging rates available - some even higher than the 5.24p/kWh export component of the FiT before its closure to new applicants in 2019. While most are fixed rates, we can expect more dynamic pricing in future with the rise of smart metering. E.ON is offering a higher ‘exclusive’ rate to customers who have installed E.ON solar.

The low offerings from companies like EDF clearly just exist to comply with the law, while deterring microgenerators to avoid the hassle of managing their supply. It’s a shame these suppliers are missing the chance to engage with small scale renewables, but it does leave the door open for the more innovative disruptors.

Tesla Energy Plan

Top of the league table for export tariffs is Octopus’s Tesla Energy Plan, a collaboration with the pioneering electric car maker. To qualify for this tariff, you must have a solar PV system and Tesla Powerwall battery in your home. You then benefit from matching 10-12p/kWh import and export rates (depending on location).

So what’s the catch? In return, your house becomes part of Tesla’s Virtual Power Plant, with the company automatically controlling battery charging/discharging and EV charging. This optimises your energy usage at the lowest cost and helps balance supply and demand on the grid. Perhaps the most exciting part is that, in theory, if you match the size of your solar PV system to your energy demand, then your annual bill could be close to £0!

How your choice of tariff affects payback

A 4kWp system is expected to produce 3,350kWh per year. Working on the basis that 50% of this is exported to the grid, export payments would be:

Export tariff price per kWh

Annual export payments

Average payback time

6p

£94

10 years

5.5p

£92

11 years

4p

£67

11 years

3p

£50

12 years

1.5p

£25

13 years

0.5p

£8

14 years

Payback time is calculated assuming electricity prices and export tariffs inflate year-on-year.

While the much lower tariffs provide minimal annual returns, they only add a few years to the payback time, and there is little difference between 4p or 5.5p. This is because most of the savings come from using your solar power on site, where it displaces grid electricity at 16p per kWh.

Which tariff should you choose?

The natural instinct is to go for the highest export tariff, but you should also note the details of the offer:

  • how often you get paid;
  • minimum payment thresholds;
  • how you get paid (bank transfer/cheque etc);
  • whether export payments cover power from battery storage;
  • length of the term you’re locked into the tariff;
  • whether the rate may change during your contract.

According to Ofgem, you can choose different companies for your export payments and your electricity supply. But some suppliers such as SSE and Octopus insist you must be a customer to be eligible for their SEG tariff.

Calculate your savings

To see the effect of SEG rates on the payback and returns of your PV system, try out our solar calculator:

Go to solar calculator

Or if you’d like to find out more, give us a call on 0118 951 4490.

Topics: Tariffs, Solar PV

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