Hong Kong's first environmentally-friendly prison has stirred up a debate in one of the world's most densely populated cities where many live in dingy and overcrowded high-rise flats.
Billed as the jail of the future, the sprawling 1.5 billion Hong Kong dollar (200 million US) facility was built based on a sustainable concept that promotes open space with green and energy-efficient features.
Authorities said the Lo Wu prison, the newest of the city's 16 prisons, which opened in August, aims to provide more humane living conditions for some 1,400 female inmates as the city moves to ease prison overcrowding.
The prison boasts advanced features such as a "green" roof to lower temperature, rooftop solar panels, a natural lighting system, high-headroom spaces and large dormitory blocks to enhance natural ventilation.
The Lo Wu facility took three years to build and sits on a huge plot of land of about 53,000 square metres (around 570,000 square feet) in the city's outlying New Territories bordering China.
But it has raised eyebrows after winning a green building award last week, with critics saying the government is not doing enough to promote similar healthy living for many of the city's seven million people.
The English-language South China Morning Post ran an editorial with a headline "Green prison shows up failings in our priorities," while readers wrote in to express their anger over the new jail.
"It illustrates perfectly an admirable trait of the Hong Kong public and the criminal justice system in which the primary hope is that criminals are rehabilitated during their time in jail so that they can contribute constructively to society upon their release," the Post said.