Germany has quite a boom in this business.
Either individual farmers or unions of them are providing heating services.
Not only for industry, also for schools and dwelling zones etc.
In most cases “small” stationary heating plants are built. In some cases they use mobile container based units.
The heating material usually is wood chips.
Some newer plants are also producing electricity.
And often the wood burning plants are combined with biogas plants.
The biogas plant provides electricity and warm water year around. And the extra heating demand in winter is provided by burning wood chips.
Excess heat from the biogas plant in summer is often used for drying the wood chips. Thus they do not waste the excess heat but are using it to increase the fuel value for the winter.
But it is a big materials moving business. I am not sure if it really can be called permaculture.
A village 10 kilometers from my home has built a cooperative biogas and wood chip system combined with solar panels. By now more than 60% of the houses in the village are connected to the system. Most of the others are heating with wood from their own forests, too.
The village´s website with some pictures and videos:
http://bioenergiedorf-effelter.de/mediathek-ubersicht/
By now their system includes:
-Biogas plant with 2 x 65 kW current generators (130 kW electric power, about 250 kW thermal power, the rest of the heat is required for heating the biogas reactors).
-Wood chip heating system with 500 kW thermal power.
-Wood chip drying hall
-2,4 km of isolated pipes for hot water transport through the village
-325 kWp photovoltaic systems
-60 m2 of solar hot water collectors
-3 kW water turbine
-several small private wood heating systems
One farmer is the director and is operating the biogas and heating plant. The other farmers provide the system with feed for the biogas reactor and wood chips.
We have a regenerative energy association coordinating these activities in our region.
http://www.energie-frankenwald.de/gallery.html