For many Malaysian homeowners, installing solar comes with one clear expectation: lower electricity bills.

So when the electricity bill still arrives higher than expected, the reaction is understandable: Rage. Upset. Disappointed.

Didn’t we already install solar?

The answer is not always simple. In theory, solar power is meant to reduce reliance on the grid. Less electricity used means less charges, right? But under today’s government-mandated framework and our lifestyle, savings are no longer just about how much electricity a system generates.

They are increasingly concerned about when that electricity is used.

The Shift Under Solar ATAP

Under the previous Net Energy Metering (NEM) model, exported solar energy was easier to understand. Excess energy sent back to the grid could offset electricity consumption more directly.

With Solar ATAP, the model has changed.

PETRA has said the programme is intended to enhance energy self-sufficiency, especially as external factors such as the global energy crisis continue to influence cost to generate electricity.

Under Solar ATAP, exported energy is no longer treated like a simple one-to-one offset. Instead, the focus has moved towards self-consumption by using solar energy directly within the home when it is being generated.

This means the best value from solar comes when your household uses electricity during the day, while the panels are producing power.

But that is not how many Malaysian homes operate.

The Problem: Most Homes Use More Energy at Night

For many households, daytime energy usage is low.

Parents are at work. Children are at school. The home may be mostly empty while the solar system is producing at its peak.

Then, electricity usage rises in the evening.

Air-conditioning, water heaters, washing machines, cooking appliances, televisions, WiFi, chargers and other devices all come on after everyone returns home.

This creates a mismatch.

Solar is producing energy during the day, but the home needs more energy at night.

That is why some homeowners may still see electricity bills that are higher than expected, even after installing solar. The issue is not always that solar is not working. It may be that the energy is not being used at the right time.

This Is Where BESS Comes In

Battery Energy Storage Systems, or BESS, help address this timing gap.

Instead of sending excess daytime solar energy back to the grid, a battery system stores it for later use. That stored energy can then be used at night, during peak usage hours, or when grid supply is disrupted.

For homeowners: solar generates the power when you’re not home, but battery storage helps to make sure the power gets used when it matters most.

It Is No Longer Just About Reducing Bills

For years, solar was mainly promoted as a way to reduce electricity bills.

That is still part of the value. But the bigger picture is changing.

Today, solar and BESS are increasingly about energy independence by having more control over where your electricity comes from, when you use it, and how much you rely on the grid.

This matters as electricity tariffs, fuel prices and energy policies continue to evolve. It also matters for households that depend heavily on stable electricity for work, security, cooling, internet access and daily comfort.

A solar system without storage may reduce grid usage during the day. But solar with BESS gives homeowners more flexibility beyond daylight hours.

Why Household Consumption Matters

Before installing solar, homeowners should not only ask how big the system should be.

They should also ask: when do we use the most electricity?

A home with high daytime usage may benefit strongly from solar alone. But a home that is mostly active at night may need a different approach.

This is why proper system design matters. A good solar proposal should consider actual household consumption patterns, not just roof size or system capacity. The goal is not simply to install more panels. The goal is to design a system that fits how the household actually lives.

O&M Still Matters Too

Even with the right system design, performance still needs to be maintained.

Dust, haze, shading, inverter issues or minor faults can slowly reduce solar output over time. A system may still appear to be working, but may not be performing at its best.

This is where operations and maintenance, or O&M, remains important. Regular checks, cleaning, monitoring and inspections help protect long-term performance and ensure the system continues to deliver value.

But O&M is only one part of the wider picture.

For homeowners today, the bigger question is not only whether the system is maintained. It is whether the system is designed around how energy is actually used.

A high electricity bill after installing solar does not always mean the system has failed.

As Malaysia moves further into the Solar ATAP era, homeowners need to look at solar differently. It is no longer just about reducing bills through installation alone. It is about using energy smarter, keeping more of what is generated, and reducing dependence on the grid over time.

To learn more about professional solar operation and maintenance solutions, visit Beta Technics Malaysia on Instagram at @betatechnicsmy.

To better understand how solar and battery storage can support your household’s actual energy usage, visit www.unitedsolarenergy.com.my and explore solutions by United Solar Energy Malaysia (USEM).

This Sustainable Energy Series is in collaboration with United Solar Energy Malaysia (USEM).

The views expressed here are those of the author/contributor and do not necessarily represent the views of Malaysiakini.