The four new stainless steel brewing vessels will replace the copper one currently in use at its Northgate Brewery in Devizes. Excess energy will then be channelled back into the brewing process.
The work is due to be completed in 2009 and will save 138 tonnes of carbon a year, according to head brewer Brian Yorston, who says that figure is a "conservative estimate".
He added: "We are already quite a carbon-friendly brewery - our transport costs are kept low by using shire horses to deliver to the local area,
we don't use a lot of packaging materials and our casks are re-used. But we want to improve efficiencies to take us into the future. It's about making us greener, more energy efficient and versatile."
The grade-two listed building which will house the new brewing vessels
will be open to the public as part of the brewery's plans to attract 20,000 visitors a year.
In January, Wadworth opened a £600,000 visitor centre which is split into four areas telling visitors about the brewery's heritage,
pubs and shire horses - plus a bar area in which to sample the beers.
Wadworth's flagship brand, 6X, is available throughout its 250-strong pub estate and also in the off-trade through Oxfordshire-based Refresh UK, which was taken over in May by Marston's.