Npower has become the latest to announce it will be dropping its green tariff - though, existing customers will still be able to take advantage of the offering.
This now means five of the UK's big six energy suppliers have stopped offering green energy tariffs to new customers.
Speaking about the energy supplier's decision to cease offering green tariffs to new customers, Nick Hugh, Npower's PR manager, stated: "We haven't completely stopped the green tariffs. They will still be operating in the background, we're just not offering the tariff to new customers."
However, the development has raised concerns amongst advocators of renewable energy.
Good Energy, a supplier dedicated to providing 100 per cent renewable energy, expressed its disappointment.
Ed Gill, Good Energy's head of external affairs, said: "This is not in the interests of consumers, or the UK more widely. We need to be calling for the big six - who sell some 90 per cent of all electricity - to take responsibility for offering consumers a green tariff if we are to meet our UK targets and address energy and climate change issues.
"We are all for competition in this market place. But when the government called on energy providers to simplify their tariffs, this was presumably not what they had in mind," he added.
Many of the UK's energy suppliers participate in the Government's Green Deal initiative.
The initiative allows UK householders to get funding to improve their home's energy efficiency levels - through the installation of insulation or new boilers. However, rather than paying back the money back in one lump sum, the loan is repaid through energy bills.
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