Before installation, the household's annual electricity cost sat around £4,200, calculated against current tariff rates. Left unchecked, and assuming the long-run UK average electricity inflation rate of 7.2% (based on 2000 to 2022 data), that bill was projected to climb to over £22,000 a year by year 25, with a cumulative spend north of £275,000 across the same period.
South-facing solar panels produce more electricity per panel than east or west-facing ones, but east-west systems often produce more electricity overall, and the daily generation profile can be a better match for how most households actually use power. Whether south-facing is "better" depends on what kind of roof you have and what you are trying to achieve. For many homes, the most useful answer is that neither orientation is best used exclusively.
