Otters return to Singapore reservoir shared with 122,000-panel floating solar farm as scientists expand wildlife monitoring

Floating solar power on a massive reservoir has expanded Singapore’s green footprint.

The nation is actively pursuing its ambitious national climate goals, but faces severe land constraints.

By deploying photovoltaics on water bodies, the nation boosts its clean energy generation while overcoming spatial limits.

Ultimately, developers must implement strategic monitoring and management measures to ensure that solar generation does not disrupt local biodiversity.

However, careful monitoring of the panels’ impact on the abundant aquatic wildlife is key to maintaining biodiversity.

Can Singapore successfully balance rapid economic growth with environmental preservation?

How securing an energy future has been more challenging than expected

Climate change is accelerating, raising concerns and pressures worldwide.

Atmospheric shifts are continuing at a rapid pace due to record-high greenhouse gas emissions from burning fossil fuels.

This is despite strict international climate regulations mandating widespread decarbonization.

Island nations, such as Singapore, are especially struggling with the green energy transition.

Singapore has historically heavily relied on imported fossil fuels to power its economy.

Today, natural gas still accounts for 93 percent of its electricity generation, meeting over 60 terawatt-hours of annual demand.

Despite this, the nation aims to achieve net-zero emissions by 2050.

However, securing a sustainable energy supply has proven difficult due to physical constraints.

Land scarcity has become a major hurdle for Singapore’s renewable adoption.

The nation has a very high population density.

Available land use is usually prioritized for housing, commerce, industry, and essential transport.

This leaves little to no room for large-scale clean energy facilities, necessitating innovative approaches.

Overcoming space constraints with floating solar

Worldwide, island nations are increasingly turning to solar generation.

Among all renewable energy sources, solar is a viable domestic option, and for Singapore, it is the only one.

The island’s tropical location ensures high solar irradiance year-round.

Yet its spatial limitations make the deployment of standard ground-mounted photovoltaic farms nearly impossible.

Rooftop installations help, but they do not meet large-scale electricity demands alone.

Singapore’s overall power demand increased by 4 percent in 2024.

That is why specialized energy concepts and solutions, such as floating photovoltaics, are rising in popularity.

The nation’s National Water Agency, PUB, has taken a leading role in boosting the deployment of floating solar power.

PUB Singapore oversees all the reservoirs and is actively transforming the water catchment areas into clean energy hubs.

For example, the Tengeh Reservoir hosts 122,000 floating panels, which significantly reduce annual carbon emissions.

However, there are potential ecological trade-offs tied to the floating technology.

Managing biodiversity at Tengeh Reservoir

Maintaining reservoir ecological integrity is vital, and floating panels can disrupt this.

The Tengeh Reservoir is home to a landmark 60-megawatt floating solar farm.

PUB partnered with Sembcorp to develop the floating facility. The reservoir was chosen due to its massive surface area and low human disturbance.

Before deployment, comprehensive environmental impact surveys were conducted from 2015 to 2018.

This helped create customized floating structures that protect aquatic ecosystems and drinking water quality.

The custom-designed floating infrastructure

Floats were manufactured with food-grade, UV-resistant polyethylene, which prevents chemical leaching.

The panels feature wide openings to preserve sunlight penetration, thermal mixing, and air exchange.

Water aerators were installed to preserve healthy oxygen levels for fish and microorganisms.

The panels also have an anti-reflective coating that prevents blinding foraging species.

The reservoirs’ smooth-coated otters, fish, and raptors continue to live alongside the floating infrastructure.

In 2025, PUB began an expanded biodiversity survey to build a long-term ecological record.

By using camera traps and continuous water testing, the company can ensure that wildlife safely coexists with the green installations.

Positive long-term findings will help pave the way for floating solar deployment across other reservoirs.

Real-time biodiversity sensors will also help with early detection of ecological shifts.

Ultimately, developers must implement strategic monitoring and management measures to ensure that solar generation does not disrupt local biodiversity.