Hong Kong's Climate Reckoning: The Decisions That Will Define the Next Five Years

Hong Kong must decide within the next 18 months whether to extend the operating life of its Castle Peak coal-fired power plant or accelerate a shift to liquefied natural gas and offshore wind — a choice that will lock in the city's emissions trajectory until at least 2040. The Environment and Ecology Bureau confirmed in June that a formal policy determination is expected before the end of 2026, under pressure from the city's legally binding commitment to achieve carbon neutrality by 2050.

The timing is not coincidental. Europe is burying people from heatwave-related deaths — France recorded more than 2,000 excess fatalities at the peak of its most recent extreme heat event — and South-east Asia is watching its own wet-season floods worsen. Hong Kong, sitting at the edge of the South China Sea typhoon corridor, cannot treat those numbers as distant problems. The city logged its hottest June on record this year, with the Hong Kong Observatory reporting a mean monthly temperature of 29.8 degrees Celsius, 1.4 degrees above the 1991–2020 average.

The Infrastructure Crossroads

Two projects will define what "transition" actually means here. The first is the proposed offshore wind farm in the southeastern waters near Waglan Island, a site under active feasibility study by CLP Power since late 2024. The second is the Tseung Kwan O desalination plant, scheduled to begin Phase 2 construction in 2027, which will consume roughly 135 gigawatt-hours of electricity annually — meaning its carbon footprint depends entirely on which generation sources win the policy argument happening right now in Wan Chai government offices.

Then there is the question of buildings. More than 90 percent of Hong Kong's electricity consumption comes from commercial and residential buildings, according to figures published by the Electrical and Mechanical Services Department. The Buildings Energy Efficiency Ordinance currently requires energy audits for large commercial buildings every ten years — a cycle critics at the Hong Kong Green Building Council argue is too slow for a city trying to cut building-sector emissions by 65 percent before 2050. A review of that audit cycle, first flagged in the government's 2021 Climate Action Plan, has stalled.

Greater Bay Area Complicates the Picture

Hong Kong does not make these decisions in isolation. Greater Bay Area integration means cross-border electricity trade with Guangdong is already a reality — the city imports nuclear-generated power from Daya Bay, 50 kilometres to the northeast, which currently accounts for roughly 25 percent of local supply. Beijing's push to expand mainland renewables capacity gives Hong Kong a potential shortcut: buy more clean power from the grid rather than build it locally. The Environment and Ecology Bureau has not ruled this out, but green groups including Greenpeace East Asia's Hong Kong office warn that outsourcing generation obscures accountability and does nothing for the city's own grid resilience during extreme weather events.

There is also money at stake. Singapore announced in January that it would cap its carbon tax at S$50 per tonne through 2027 before raising it further. Hong Kong has no carbon tax. The city's HK$80-per-tonne carbon credit price under the voluntary Guangdong-Hong Kong Emission Trading Pilot Scheme is not a tax, and business groups from the Hong Kong General Chamber of Commerce have lobbied hard to keep it that way. International investors making long-term commitments to the financial district along Connaught Road and in Quarry Bay are increasingly asking about mandatory emissions disclosures — and the Securities and Futures Commission's climate reporting rules, which take full effect for large listed companies in January 2027, will force answers.

The next six months are the crunch. The Legislative Council environment panel is scheduled to review the revised Climate Action Plan 2.0 in September. The CLP offshore wind feasibility report is due to the government by October. And the buildings ordinance review is quietly back on the bureau's agenda after two years of delay. Each of those processes involves public consultation periods that environmental groups say are too short and business groups say are too vague. Residents in Sham Shui Po and Tuen Mun — neighbourhoods that sit downwind of the heaviest industrial activity in the western New Territories — will notice the difference between the two outcomes long before 2050.