M&S will roll-out a number of new products including bespoke energy advice, renewable energy solutions such as solar panels & heat pumps, and energy efficient heating products over the coming months.
The retailer hopes it will build upon M&S Energy which launched just over a year ago and currently services over 125,000 homes.
Marks & Spencer started selling gas and electricity in October 2008 after striking a deal with Scottish and Southern Energy. The retailer rewards customers who cut their energy use with shopping vouchers.
The first new service, M&S Energy Home Insulation, launches this week offering loft insulation and cavity wall insulation, starting from £149 for each service.
M&S said cavity wall insulation can save the average householder around £115 per year on heating bills and 610kg in CO2 emissions.
M&S is also offering free loft or cavity wall insulation to all its employees. If all qualifying employees take up the offer, the retailer says that it will insulate 30,000 homes for free.
M&S will also give its customers vouchers on anniversaries in recognition of their loyalty. The Home Energy Service is sold through M&S stores and at .
Richard Gillies, director of Plan A at M&S, said: "We hope to create 30,000 green M&S ambassadors by offering this energy efficient solution free of charge to our employees.
"It will produce a significant cut in their carbon emissions, cut their energy bills and, we believe, inspire them to become advocates for energy efficiency."
Stephen Langford, head of M&S Energy, said: "Marks & Spencer is committed to making it easy and cost effective for our customers and employees to reduce their carbon footprint. We've launched a service that takes the hassle factor out of home insulation and applies M&S standards of quality, value and customer service."
In December Sainsbury's partnered with EDF Energy to create a chain of in-store home-energy advice trial kiosks. Consumers could consult with EDF advisers about the best way to save money and make their homes more energy efficient.
Both are members of the Nectar loyal programme, and had previously collaborated on the energy company's 'Read Reduce Reward' service, which allows consumers to gain bonus Nectar points when providing readings to verify their energy usage.
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