I'm going to burst some bubbles
This looks more like they're using Bitcoin as PR than anything else. First, they sell 21 Lalibela tulip bulps for €41. I checked another website, and for the same price I can buy 6 times more bulbs (including shipping). So that's a massive profit margin.
Allow me to share some history: Dutch greenhouses are quite famous, also international, and most of them are concentrated in Westland. The reason they grow fruit, vegetables and flowers in greenhouses is of course because it's very profitable. It's a massive industry, and they got quite wealthy out of it. The main reason: very cheap natural gas! They used to burn the gas just for CO
2 and heat, while getting electricity for grow lights from the grid.
Later, more and more of them switched to Combined Heat and Power (CHP), producing their own electricity: they burn the gas in gas turbines that power generators, create electricity, sell part of it back to the grid, and still get the same amount of CO
2 (and a slightly lower amount of heat). Apart from being less polluting, the main reason was of course increased profitability. They basically became power companies.
Nowadays, there's a CO
2 pipeline from the Botlek industrial area, "feeding" plants in Westland greenhouses. They turn waste CO
2 into food, which is a further efficiency improvement.
Now back to BitcoinBloem:
Grown with miner heat, using electricity instead of natural gas.
In januari 2022 a greenhouse saw natural gas prices explode. Trying to heat the greenhouse with conventional spiral heaters a more efficient and cost effective plan was proposed.
I'm not buying it. From an energy perspective, a Bitcoin miner is nothing more than resistor heating. Even though 100% efficiency sounds like a lot, it's not. It turns high quality power into low quality heat, at a Coefficient of Performance (CoP) of 1. A heat pump could do about 4 times better, and basically any other heat source would be more efficient too.
If they would use the electricity in a grow lamp instead of a Bitcoin miner, they'd get the exact same amount of heat. But the light would also grow crops. And as much as I like Bitcoin, it sounds much less good when you say you use electricity that could have been used to grow food to mine Bitcoins.
This is in Netherlands so I guess this is why they use it for flowers like tulips
I guess that instead of flowers they could also grow food like fruits and vegetables, and this could be done in especially in cold regions.
Even better: it can be done in warm regions, using natural solar light and heat instead of consuming fossil energy.