In Tampere-Finland's Manchester, where the nation's first lightbulb flickered to life and steam has powered progress for over a century-a group of boiler veterans had a hot idea. They'd spent years perfecting combustion systems, but as the climate clock ticked and energy costs soared, it was clear: the future of industrial heat needed to be clean, renewable-and stored smartly.

So in the happiest country on Earth, from the land of a thousand lakes and a million saunas, they launched a new kind of heat revolution. One where steam still rises-but now from the power of the sun and wind, not fossil fuels. From Tampere with heat.