Solar Export Meter

So, I’m going to note the generation we manage from the 4kWp solar PV on the roof, installed end of November 2013e. For background on this page, click the ‘solar’ category in the top menu, and for an explanation of the figures, read this next waffle.

To clarify, in addition to the cash return on electricity generated there is the cash not spent on the electricity that would have been imported but for the generation, plus the cash not spent on gas that isn’t being used to heat the water (given the solar diverter does that instead). Each monthly solar blog page (click solar on the top menu for the first twelve months readings) tries to detail how much money overall has moved in either direction.

The £(Gen+Exp) is the presumed payment for the month, according to the current regulations. There is a FiT (feed in tariff) Generation payment of (originally) 14.9p for every unit (kWh) of electricity generated, and also an export payment of 4.64p per unit for 50% of the electricity generated, assuming you use half of it yourself. Makes sense, of course, to use as much of it as you can… so if we generated 50 units of electricity there would be a payment of (14.9 x 50) + (4.64 x (50/2)) = £8.61. Paid quarterlyI think it’s tax free. I think it’s index linked. I think I’m right. Time will tell. Finally, because we have generated 50 units we’ve not had to import them, at 12.45p/kWh, so that’s an additional saving of (50 x 12.45) = £6.22 bringing the overall cash equivalent return of the example 50 generated units to £14.83.

  • May 2014. To confuse us further, SSE sent the contract through and the FiT rate from 1st April is 15.3p and the Export rate is 4.77p. I’ve amended the cash figures to reflect that… let’s see if the eventual cheque at all closely matches the calculations! (And they do!)
  • October 2015. I note that on 1st April 2015 the figures changed again, to 15.54p and 4.85p, FIT and export respectively. Second year chart figures recalculated accordingly.
  • from 1st April 2016 our FITs are 15.73p and 4.91p.
  • 1st April 2017 FIT increased by 2.5% (16.12p and 5.03p)
  • 1st April 2018 FIT now 16.78ppu and 5.24ppu

1. In July I had a payment of £188.66 which covered December through 12th May 2014
2. In October 2014ce I had a payment of £374.18 covering period up to 30th September.
3. In March 2015ce I had a bank credit for £80.84 covering up to meter reading 3664
4. In November 2015ce I received £585.42 covering meter readings to 6930 (read 13th October).
5. In April 2016ce the FIT was £153.69 covering meter readings to 7784 (meter read 14th April)
6. 16th August meter at 9126 FIT paid £244.03
7. 23rd January 2017  meter reading 10567 FIT payment £261.31
8. FIT raised by 2.5% April 2017, meter read on 2nd as 10986, paid £76.22
9. FIT @ 12360 sent in 8th July 2017, paid £256.03 19th July.
10. Fit to 1st October sent 6th October 13589, due £229.01 (£2449.39)
11. Forgot to send a December ’17 reading. They sent me an estimate of zero and paid me 8p…
12. Sent off meter reading 1st April 2018 14349. £141.96 paid 10th April (£2591.43)
13. Meter Reading requested 4th July 2018 15782 (1433 kWh = £277.99) (£2869.42)
14. Meter read 28th September (£230.26) Total = £3099.68
15, meter read 31/03/2019 17868 (£174.38)

Total cash to date = £3274.06 (ignoring the saving on reduction of gas and electric energy imports)

The first year… 2014

Month endMeter ReadingkWh Generated£(Gen+Exp)£ cumulative
December 20130066.150067£11.53£11.53
January 20140138.520072£12.39£23.92
February 20140285.140147£25.31£49.23
March 20140577.480292£50.28£99.51
April 20140928.800351£60.44£159.95
May 20141382.750441£77.99£237.94
June 20141921.640539£95.32£333.26
July 20142471.080549£97.17£430.43
August 20142866.830396£69.99£500.42
Septembr 20143206.820340£60.13£560.55
October 20143379.820173£30.60£591.15
November 20143476.270096£17.06£608.21
December 201435520075£13.39£621.60

The Second Year… 2015

Month endMeter ReadingkWh Generated£(Gen+Exp)£ cumulative
December 201435520075£13.39£621.60
January 201536410089£15.74£637.34
February 201537770136£24.05£661.39
March 201540520275£48.64£710.03
April 201545300478£85.87£795.90
May 201550300500£89.83£885.73
June 201556070577£103.65£989.38
July 201561290522£93.77£1083.15
August 201564790350£62.88£1146.03
Septembr 201568390360£64.67£1210.70
October 201570100171£30.72£1241.42
November 201570730063£11.32£1252.74
December 201571180045£08.08£1260.82

The Third Year… 2016

Month endMeter ReadingkWh Generated£(Gen+Exp)£ cumulative
December 201571180045£08.08£1260.82
January 201671960078£14.01£1274.83
February 201673680172£30.90£1305.73
March 201676160248£45.10£1350.83
April 201680150399£72.56£1423.39
May 201685050490£89.11£1512.50
June 201689500445£80.92£1593.42
July 201694460496£90.20£1683.62
August 201698810435£79.10£1762.82
Septembr 2016101570276£50.19£1812.91
October 2016103620205£37.28£1850.19
November 2016104650103£18.73£1868.92
December 2016105440079£14.37£1883.29

The Fourth Year… 2017

Month endMeter ReadingkWh Generated£(Gen+Exp)£ cumulative
December 2016105440079£14.37£1883.29
January 2017106100066£12.00£1895.29
February 2017107300120£21.82£1917.11
March 2017109870256£46.55£1963.66
April 2017114020416£77.52£2041.18
May 2017118670465£86.65£2126.83
June 2017123600493£91.87£2218.70
July 2017128420482£89.82£2308.52
August 2017132520410£76.40£2384.92
Septembr 2017135890337£62.80£2446.80
October 2017137140125£23.29£2470.09
November 2017138180104£19.38£2489.47
December 2017138810063£11.74£2501.21

The Fifth Year… 2018

Month endMeter ReadingkWh Generated£(Gen+Exp)£ cumulative
December 2017 13881 0063£11.74£2501.21
January 2018 13958 0077£14.35£2515.56
February 2018 14146 0188£35.03£2550.59
March 2018 14349 0203£37.83£2588.42
April 2018 14649 300£58.20£2646.62
May 2018 15157 508£98.55£2745.17
June 2018 15782625£121.25£2866.42
July 2018 16296514£95.78£2962.20
August 2018 16704408£76.03£3038.23
Septembr 2018 16969265£51.41£3089.64
October 2018 17211242£46.95£3136.59
November 2018 1731099£19.20£3155.79
December 2018 1736757£11.06£3166.85

The sixth Year… 2019

Month endMeter ReadingkWh Generated£(Gen+Exp)£ cumulative
December 2018 17367 57£11.06£3177.91
January 20191744174£14.36£3192.27
February 201917611170£32.98£3225.25
March 201917868257£49.86£3275.11
April 201918277409£79.35£3354.46
May 201918740463£89.82£3444.28
June 201919170430£83.42£3527.70
July 2019££
August 2019££
Septembr 2019££
October 2019££
November 2019££
December 2019££

Pre-Solar Electricity Consumption averaged 2009-2013 at 6,500 kWh per annum

Post Solar Electricity Consumption averaged 2014-2018 at 4,300 kWh per annum

It’s important to note that the “£ cumulative” is solely the earned cash return from the generation. Savings on fuel bills are extra and potentially at least equal to the FIT. Gas use has reduced in the summer months because the overflow generation is pushed into the immersion tank, while electricity consumption obviously reduces in line with generated power used on site.

For ease of estimation, I would double the FIT and take that as the payback on the solar installation investment. Therefore it is likely this investment was paid off by end of year four, and the subsequent sixteen years of the FIT contract are clear profit.

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