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The US delegation toured a number of sites where energy saving systems and eco-friendly devices have helped reduce carbon emissions and help Greenwich reach green targets.

The visit formed part of a tour of London by American environmental leaders.

It's hoped the US will be able to replicate some of the ideas already put into place in the capital.

Cllr Rajwant Sidhu, who oversees green issues in Greenwich, welcomed the American party, taking them to residential buildings across the borough.

He said: β€œwe are honoured that the delegation chose Greenwich as an example of eco-friendly practice."

Cllr Rajwant Sidhu shows the CHP system

Combined heat and power systems

The group was shown how a recently refurbished block of flats had been fitted with a mini combined heat and power (CHP) system.

Raven's Way, close to Mottingham, now uses the CHP system - where the heat produced when electricity is generated, is then used again to provide extra energy.

Unlike conventional forms of power generation, the by-product heat that is normally wasted is retained and utilised.

The Combined Heat and Power Association say systems like that now used at Ravens Way can improve energy efficiency by up to 70%.

Solar power

The second stop on the American's tour was Hider Court off Shooters Hill Road. Here the council showed off solar power technology, again designed to help reduce energy usage.

The installation of 'photovoltaic systems', or solar power, has helped the building to reduce its carbon emissions and the cost of lighting the communal hallways.

The visit finished at Greenwich Eco House, where residents are able to see good practice in an exhibition to demonstrate green living.

Ms Kristen Baginski, Deputy Chief of Staff to the Mayor of Pittsburgh who lead the delegation, praised the borough's efforts to improve energy efficiency.