Tesla Certified Installer · Approved Octopus Energy partner · Rated 4.8 on Google from 51 reviews.
Our services
SOLAR & ENERGY STORAGE
Generate and store your own electricity to cut bills, reduce grid reliance and gain real control over rising energy costs.
EV CHARGING
Charge your EV conveniently at home or work, reducing running costs and securing long-term savings.
HEAT PUMPS
Install an efficient heating system that helps lower your energy bills and provides reliable space heating and hot water for your home.
Figures are estimates, not a guarantee. Generation is from SolarEdge and Tesla monitoring of systems we’ve installed or maintain (Oct 2026). Savings value 35% of generation used on site at the Ofgem price cap average of 26.32p/kWh (Oct to Dec 2026) and 65% exported at 12p/kWh (Outgoing Octopus). The yearly figure is the average across monitored systems over the last 12 months. Actual savings vary by property, tariff and usage.
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What our customers say
★★★★★
“Outstanding supplier and system designer… the standard of his work was exemplary (particularly his neatness). HIGHLY RECOMMENDED!”
Will Brocklebank · Tesla Powerwall · Google review
★★★★★
“I have been impressed with the high quality service and honest, can-do attitude. I would not hesitate to recommend Derry/Shawcan to others.”
Kevin Perrett · Solar & heat pumps · Google review
★★★★★
“His installation work was simply amazing – the attention to detail and finishing was impeccable.”
Faraz Khan · EV charger · Google review
★★★★★
“Conscientious, neat and tidy work was carried out… I shall certainly be using him again.”
Ann Moore · Heat pump service · Google review