Posted on 25 November 2013 by CompareMySolar. The price of electricity in the UK in 2013 averages 17.2 pence per kWh according to updated analysis of CompareMySolar, following last years article.he following graph gives average rates for Low (2100 kWh per year), Medium (3300 kWh) and High (5100 kWh) electricity users that either pay by direct debit (cheaper) or standard credit (more expensive): This gives us the following average price per kWh per energy company 1  : British Gas: 16.6 pence per kWh.