Forest09.01.2012

Keravan Energia and Koskitukki: a partnership that produces electricity and heat

The wood fuel delivered to customers primarily consists of chips made from tree crowns and small-diameter timber.

The wood fuel delivered to customers primarily consists of chips made from tree crowns and small-diameter timber.

A Koskitukki lorry arrives at Keravan Energia’s bio-power plant four times a day, every day of the week.

This environmentally friendly power plant is fuelled by a mixture of wood, bark, plywood by-products and milled peat. It generates process and district heat for a clientele of 1,500 and electricity for over 30,000 households and companies in the economic region.

Koskitukki collects forest energy from the tree crowns and stumps left over from final fellings, from the reconditioning of young forests and, for example, from logging carried out in forests bordering fields. The wood fuel delivered to customers primarily consists of chips made from tree crowns and small-diameter timber. One of these customers is Keravan Energia, whose co-operation with Koskitukki goes back several years.

- As we need fuel 24 hours a day, we are in contact with Koskitukki almost daily. Koskitukki’s location is logistically ideal for us. If our biofuel reserves must be supplemented quickly for one reason or another, we have a partner close at hand, says Keravan Energia’s Production Director Heikki Hapuli.

Complementary by-products

Koskisen Group uses some 900,000 solid cubic metres of logs per year, and the by-products, i.e. bark, chips and sawdust, amount to over one million loose cubic metres per year.

In addition to wood chips, the raw material deliveries to power plants are supplemented with by-products from the Group’s production plants. This ensures secure deliveries, especially during bad road conditions and fuel consumption peaks.

Under Koskitukki’s and Keravan Energia’s partnership, the customer pays for the wood fuel based on its energy content.

- Koskitukki provides us with calorific value, which is measured for each load in the laboratory. The dryer and cleaner the wood material, the better and more evenly it will burn, says Hapuli.

According to him, the operation and production efficiency of the bio-power plant, which went on stream two years ago, still has room for improvement. That involves more efficient utilisation of the raw material and higher quality. For Koskitukki, that’s nothing but good news.

- Bio-energy accounts for over 75 per cent of our total heat production, but we want to increase its proportion even further, says Hapuli.

One lorry load per hour

When operating at full capacity, Keravan Energia’s power plant consumes about one lorry load of fuel per hour. The fuel reserves cover the fuel requirements for several weeks. The power plant generates 21 MW of electricity and 42 MW of heat.In addition, it produces up to 10 MW of process heat for the brewery and softdrinks company Sinebrychoff’s needs.

According to Koskitukki’s Bio-Energy Manager Juha Hyvärinen, close contacts and repeated orders add up to pleasant co-operation, which has been developed to be as easy and smooth as possible for the customer.

For Hapuli, who recently visited Koskitukki, Koskitukki’s presentation on the bio-energy procurement and supply process was an eye-opener.

- It’s good also for us to have a general idea of what the lorry driver’s day has entailed before arriving at Kerava with his load. If his day started at dawn somewhere in the forest, we should not keep him waiting behind our gates any longer than necessary, Hapuli laughs.