For a lot of Australian households, the pattern is easy to miss because it’s become so normal. During the day, solar panels generate more energy than the home can use, so the excess is sent back to the grid for a relatively low price. Then, as the sun goes down and demand picks up, those same households start buying electricity back at a much higher rate just to keep the house comfortable.
When Nick Zeniou looked at this more closely, it didn’t quite add up. He had spent years working across heating systems, consumer technology, and large-scale energy infrastructure, and the more he thought about how homes were being electrified, the more this contradiction stood out. Energy was being generated cheaply and cleanly during the day, but it wasn’t available when it was actually needed most. So homes relied on the grid in the evening, even when they had already produced what they needed just hours earlier.
The insight: we’re solving the wrong problem
The typical answer to this problem is batteries. Store the energy during the day and use it later. It sounds straightforward, and in many ways it is. But when Nick dug into it, the solution felt mismatched to the problem most households were actually trying to solve.
Lithium batteries are expensive, they degrade over time, and they are designed to store electricity. But most of the energy used inside a home isn’t powering devices, it’s heating and cooling spaces. Once you start thinking about it that way, storing electricity begins to feel like an indirect solution to a much more specific problem.
The question shifts from how to store energy to what kind of energy needs to be stored in the first place.
A more direct way to use what’s already there
Thermal Dawn takes a more direct approach by storing heat and cold instead of electricity.
During the day, when solar energy is abundant or electricity is cheaper, the system captures that energy and stores it in a material designed to hold thermal energy as it changes state. Later, when the temperature drops or rises, that stored energy is released back into the home as heating, cooling, or hot water.
From the outside, nothing about the experience feels particularly different. The home stays comfortable in the same way it always has. What changes is when the energy is used and how much it costs. Instead of relying on expensive peak electricity in the evening, households are shifting that demand to earlier in the day, when energy is cheaper and more available.
Built by people who understand how these systems actually work
The way the product is designed reflects how Nick and Linda Zeniou have worked for years. Nick’s background spans HVAC systems, consumer technology, and large-scale energy generation, and he has been hands-on from the beginning, building and installing early versions himself. Linda, a mechanical engineer with experience in medical devices, brings a different kind of discipline, focused on precision, reliability, and manufacturing systems that can scale.
They met at university and have been building things together ever since. When Nick started working on Thermal Dawn, Linda backed the idea early, supporting the company before it had taken shape in a formal sense. Their approach has always been practical, focused less on theory and more on building something that works in real conditions.
When it became something people would rely on
Like many hardware companies, Thermal Dawn began with prototypes and testing, working through what would actually hold up outside of controlled environments. For a while, it existed as a project, something that was promising but still unproven.
That changed with the first real installation.
A homeowner in Melbourne chose to install the system, not as an experiment, but as something they were willing to depend on day to day. That shift mattered. It meant the system was no longer just being tested, it was being used in the way it was intended, with real expectations behind it.
What changes for households
For households, the impact is straightforward but meaningful. Heating and cooling costs begin to drop because energy use is no longer tied to peak pricing in the evening. The energy generated during the day can be used later, without needing an expensive electrical battery to bridge the gap.
There’s also a practical advantage in how the system is installed. Because it fits within existing heating and cooling infrastructure, it can be installed by plumbers and HVAC technicians rather than relying solely on electricians. That makes it easier to roll out at scale, particularly as more homes move away from gas and toward fully electric systems.
Rethinking where the real constraint is
For a long time, the conversation around home energy has focused on generation. Solar panels, batteries, and how to produce more electricity. Thermal Dawn shifts the focus slightly, toward how energy is used and when it is needed.
Once that perspective changes, the problem becomes less about producing more power and more about using what is already available in a more efficient way. The gap between when energy is generated and when it is needed starts to feel like the central issue.
Looking ahead
Thermal Dawn is still early, with installations underway and demand building, but the direction is becoming clearer as more homes adopt solar and move toward electrification.
In that environment, storing and shifting energy efficiently becomes just as important as generating it. Over time, thermal storage starts to feel less like an alternative approach and more like a natural part of how homes manage energy.
Because when the economics are simple and the system fits into how people already live, adoption tends to follow.
The ask
If you’re a homeowner with solar and high evening energy bills, or an installer thinking about how your work evolves as homes electrify, the team would love to hear from you.
You can learn more at thermaldawn.com
Watch them pitch at Demo Day
When: Thursday, 30 April @ 7:00 PM (pre-party starting at 5 PM)
Where: Carriageworks (at the close of Blackbird's Sunrise Festival)
What: Pitch night (19 companies)
Tickets: Grab your ticket here
