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About Tenco
Tenco is one of New Zealand’s largest exporters of forest products. We have built to this position since 1991 when the company was set up to export lumber to growing Asian export markets.  Experience and reputation count; from small beginnings Tenco has become the largest independent exporter of New Zealand lumber and New Zealand’s 4th largest log exporter.  Tenco has a regular shipping program of their own log vessels and in combination with these and other ships currently calls  at 7 New Zealand ports (5 North Island and 2 South Island).
Tenco buys standing forests.  Tenco currently has a number of forests which they purchased at harvestable age to log over a number of years for export and domestic markets.  Tenco also regularly buys smaller tracts of forest to harvest immediately or immature forests to hold until harvest time.  Tenco is interested in broadening  the  base of owners from whom it purchases forests and stands of trees.  A deal with Tenco is a certain transaction.  The owner and Tenco will agree on a value of the tree crop and then Tenco will pay this amount to the owner either in a lump sum amount or on rate per volume unit out-turn from the forest depending on the nature of the tree crop.
Tenco knows there are a lot of farmers who have trees that are close or ready to harvest and will be asking themselves how they should proceed with the sale of their trees.  For some farmers the kind of certain transaction with money in the bank could well be appealing. Tenco is actively interested in buying harvestable forests or trees from areas including all the North Island (except the Gisborne and East Coast districts) and Nelson & Marlborough in the South Island .
If you own a forest in this area (16 years and older) and are ready to enter into this kind of agreement Tenco is interested to develop something with you.
Please contact: 
Work: +64 7 357 5356  Mobile:  +64 21 921 595

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Eucalyptus selection for New Zealand - what is the elephant in the room?

Dean Satchell's blog
Thursday, November 10, 2016

We each grow forest plantations for a reason. Those reasons may vary, but my primary reason is for a return on my investment. This means producing wood or fibre as fast as possible from trees that remain healthy throughout their rotation. 

I'll be so blunt as to state that the most important factor to consider when selecting eucalyptus species for commercial forestry in New Zealand is forest health. I state this categorically and from experience.

The problem for growers in New Zealand is that each new pest that "blows across the ditch" from Australia adds to the pest load and eventually the burden gets too much. Serious pest attack on forestry plantations can be devastating and many of us have seen it. However, where this gets interesting is in species selection for insect resistence. Each new pest that arrives favours certain eucalypt species. Just some. Never all eucalypt species. Most people lose interest at this point because there are just so many species of eucalypt... and there are now so many pest species that it all becomes too complicated ...and so the grower exclaims that eucalypts are bug fodder and throws in the towel.

However, this is not quite an accurate summation. Let me explain why. The key to understanding it all is to divide eucalypts into two groups: "Monocalypts" and "Symphyomyrts". I'm not going to go into taxonomical details about what separates these two groups, but what I am going to show you is black and white. What observant growers have begun to notice in New Zealand that could give us the edge globally on growing eucalypt plantations.

The edge you ask? How could that be... we're getting all the pests and euc's don't grow here any good. Look at Brazil I hear you say, they can bloody well grow the things in ten years or less! No pests over there... too far from Australia. Well... I would suggest that this is changing with world trade the way it is, it is only a matter of time before South America, Asia, Africa and Europe will provide a green salad smorgasboard for a plethora of these Australian eucalypt munching pests too. So what species are they all growing? Symphyomyrts. Why? Because symphyomyrts grow faster than monocalypts (we all love early growth, don't we). Commercial eucalypt plantations throughout the world are almost exclusively Symphyomyrtus species. Indeed we started that way in New Zealand and planted lots of blue gum (Eucalyptus globulus) over 100 years ago because it grew so well. Unlike the rest of the world however, the eucalyptus tortoise beetle Paropsis charybdis then arrived and saw to our blue gum plantations. Chewed the shit out of them so we gave up. Now the same thing is beginning to happen in other countries.

At this point I have to say we're a resilient lot, us New Zealanders, and there are always crackpots who are willing to try something else. Lots more euc species just over there in Australia, with planters willing to give any of them a go. What emerged eventually, from decades of trial and error, has been consistent and compelling... the species that grow best here are the monocalypts. Took a while for many of us to realise, and some still doggedly perservere with symphyomyrtus species because of fast early growth or desired wood properties such as colour or durability. But with the arrival of each new pest species, the list of starters gets smaller and smaller.

Unless you see the light, you're on a sinking ship. Believe me. Monocalypts don't get the bugs like the symphyomyrtus species, we've known this for some time (see here and here).

The monocalypts could be said to be "ordinary". Their timber is not particularly colourful, nor highly durable... but the wood is durable enough and colourful enough for most applications. Their early growth is quite ordinary by international standards, but what we've discovered is their resilience. They've brushed off everything that Australia has thrown at us and grow pretty much as well as they always have. Their lack of fast early growth is made up for by solid, consistent growth over the medium and long term (similar to radiata but slower than Brazilian eucalypts). The monocalypts are well adapted to moderate fertility and free draining sites in the same way radiata pine is. There is no doubt whatsoever in my mind about their commercial potential. Their timber is stable and easy to mill and dry. The sapwood band is consistetly small, as is the defect core. 

Lets have a look at some serious pest introductions and their favourite tucker:

Eucalyptus Variegated Beetle (EVB) Paropsisterna variicollis

Serious damage: E. bosistoana, E. tricarpa, E. cladocalyx (all Symphyomyrtus)

Little to no damage: E. muelleriana, E. globoidea, E. macrorhyncha, E. eugenoides, E. pilularis, E. fastigata, E. obliqua, E. regnans (all Monocalyptus)

Bronze Bug, Thaumastocoris peregrinus

Serious damage: E. camaldulensis, E. grandis (all Symphyomyrtus)

Little to no damage: E. muelleriana, E. globoidea, E. macrorhyncha, E. eugenoides, E. pilularis, E. fastigata, E. obliqua, E. regnans (all Monocalyptus)

Brown lace lerp, Cardiaspina fiscella

Serious damage: E. saligna, E. botryoides, E. robusta, E. grandis (all Symphyomyrtus)

Little to no damage: E. muelleriana, E. globoidea, E. macrorhyncha, E. eugenoides, E. pilularis, E. fastigata, E. obliqua, E. regnans (all Monocalyptus)

Eucalyptus Tortoise Beetle Paropsis charybdis

Serious damage: E. globulus, E. quadrangulata, E. grandis, E. scias, E. nitens, E. camaldulensis, E. longifolia, E. macarthurii, E. leucoxylon (all Symphyomyrtus)

Little to no damage: E. globoidea, E. macrorhyncha, E. eugenoides, E. pilularis, E. fastigata, E. obliqua, E. regnans (all Monocalyptus)


You should start seeing a picture emerging. Each new pest has an appetite for some of the symphyomyrts, but not all. But as they keep coming all the bases eventually get covered.

The question I am asking and one I would appreciate some feedback on below, is at what point do we say enough is enough, see the light and stick to planting monocalypts?

Footnote: Monocalyptus species include E. regnans, E. obliqua, E. fastigata (Ash group), E. pilularis, E. sphaerocarpa, E. globoidea, E. muelleriana, E. laevopinea, E. macrorhyncha (Stringybark group).   

Biomass as energy

Rik Deaton's Blog
Monday, September 05, 2016

I have a strong interest in the biomass-as-energy-source sector of renewable energy generation and I see it as inevitable that this country’s incomprehensible barriers to uptake will shortly be torn down as the many benefits that could accrue are just too compelling to be denied much longer. Those with the land to grow trees (and other biomass sources) ought to be the first to be enlightened that it is now entirely possible to burn wood (et al) with close to zero localised air pollution and that it is done to great effect and at a prodigious rate in Europe as a widely understood everyday activity. It is my strongly held opinion that every farm in this country should consider planting a mixed woodlot and/or crop of fast-grow/short-turnaround species for biomass production. Such on-farm diversification would have far reaching positive consequences in both commercial and environmental contexts but there are presently few financial incentives to do so because the market for biomass-as-energy is almost non-existent here. This is largely because forestry production in NZ is considered strictly for sawlog production and essentially ignores the local-for-local energy creation of a distributed biomass production network.

The premise of my submission to ORC was that wilding pines ought to be treated as a resource rather than as a problem; once that volte-face is accomplished the management of the trees becomes automatic and revenue positive. What has happened instead is that farmers down this way are now receiving tree eradication orders (as if it was their problem alone) and the Otago Regional Council is about to impose yet another quixotic region-wide exotic species eradication levy as part of its rates assessment because of the idiocy of the way wilding pines are to be opposed here.

The domestic supply chain for biomass based fuels (pellets, chips, firewood) is choked so the uptake of modern clean-burning biomass fired heating systems is choked ... or is it the other way around? We accept nothing prior to Euro 5 & Euro 6 vehicle emissions standards, as determined in Europe, as the acceptable benchmark under which motor vehicles can be imported into the country. However, each model of each manufacturer’s wood fired heating devices, and there are hundreds of manufacturers and thousands of devices, must be tested and certified here - “under tough Kiwi conditions” (yes, as we all know, there are no tough conditions in Europe, NZ is unique) - as opposed to simply accepting the Euro certifications they already carry as we do with motor vehicles. So guess how many manufacturers and importers are going to bother with that cost for a market of 4 million when they are already serving a market of 750 million? Is it the chicken or is it the egg? Bureaucratic stupidity on a grand scale and all that is required to fix it is a visit by someone with a functioning brain to a few Euro trade shows to see what is ?possible and what is available off the shelf to do it; or just maybe some local manufacturer could figure it out and build it here. There is some concentration on this now at the larger scale commercial end of the field but the critical domestic end is being completely blocked by our utterly invalid clean air regulations that prohibit installation on less than two hectares in most suburban areas (see attachments to understand this) and by the requirement for model by model re-certification.

So here we are with the least energy efficient residential building stock in the developed world, homes from which Central Heating Systems, considered the norm elsewhere, are totally absent, and our regulators are converting the population away from heating via a cheap renewable energy source, biomass, to heating with electricity via heat pumps, with all that implies. This, on the erroneous and invalid assumption that burning wood always causes unacceptable levels of localised air pollution. This transition is being forced by a regulatory environment that is devoid of any trace of a “shit, we got that wrong, maybe we’d better have a rethink” mechanism. The 21st century clean-burning replacement to the Model-T Ford log burners we use are staring them in the face but they ban their installation in most areas of the country.

Sporadic installation of wood gasification boilers as the heat source for modern residential central heating systems (which also provide domestic hot water as a small added side benefit!), as central heating slowly penetrates the built environment of this country, is the obvious way to gradually develop the biomass-as-energy supply chain. This self evident strategy is specifically ignored by government - I heard the Assistant Minister for the Environment say so at the “Yes We Can BioEnergy Symposium” in Wellington earlier this year ... in the same speech in which he said it was a great idea to decommission the Euro-style electric trolley bus system in the nation’s capital and replace those emission free public transport units with diesel powered buses ... but the biggest thing we could do to reduce New Zealand’s GHG emissions was to convert the nation’s car fleet to all E-vehicles.

Whilst E-vehicles are undoubtedly coming, and that is a very good thing, the Minister didn’t seem to grasp the breathtaking logical disconnect of these two positions. Such is the level of governmental comprehension of these issues; they haven’t a clue and yet they decide policy. Not a word about how all the additional E-lectricity to charge this new national fleet of E-vehicles was to be generated, not a word about energy efficiency, not a word about promoting bio-energy as he spoke at a bio-energy conference and certainly not a word (by anyone at the conference) about doing anything at all in the residential sector as the entire emphasis was on the industrial and the corporate. This despite all the pathetic PC hand-wringing twaddle about how “Kiwis are entitled to live in warm, dry, comfortable homes” (whatever that means) and how “landlords must install insulation” (whatever that means) whilst local governmental consent authorities still allow thermal energy colander homes to be built every day and national government won’t allow them to be heated in any rational manner.

The burning of biomass as an energy source will make viable the large scale planting of biomass for that purpose here in New Zealand as it has done over much of the rest of the world. This will be a valuable added income stream for farmers and it can often be accomplished on marginal or unproductive land, riparian verges, mountainsides, highway and road reserves and so on. It allows a totally different set of economic metrics to be utilised to those considered for sawlog plantations. Government, as is so often the case, simply has to just get out of the way and let it happen.

But, despite being presented with all the information they could possibly have required to take a different and far more rational direction on the issue... guess what? Yes, as I said earlier, tree eradication orders to local farmers and a new region-wide rates levy to fund fighting the good fight against the dreaded wilding pine. No strategy whatsoever for the conduct of that fight, mind you, just a hundred grand to “fight wilding pines”, then on to the next item of the meeting agenda: “how to control wintertime air pollution caused by smoking log burners in our atmospheric inversion plagued townships” ... such is the compartmentalisation of the bureaucratic mind.

So, can I distil my thirty five pages into something far less taxing to read? Well. I guess I’ll have a go here in point form:

  • We, western industrial society, are addicted to energy.
  • the primary form of energy, and the one that allows access to all others, is oil.
  • We are at or beyond Peak Oil right now.
  • There is an energy revolution happening right now and renewable technologies are finally beginning to take the high ground - very, very rapidly.
  • One of the key renewable sources of energy is biomass
  • Biomass is the only form of combustable energy that is renewable.
  • Not only is biomass renewable but it is renewable on a human timescale and it is carbon neutral.
  • One of the key areas of energy consumption is the residential built environment.
  • In the order of 80% of residential energy consumption in a temperate climate is expended on heating water and on space heating and cooling.
  • When one considers renewable energy strategies it is energy efficiency that absolutely must be considered first.
  • The more efficient the energy consumption system the less energy must be used to operate the system irrespective of the source of that energy. Energy saved is greater than energy generated.
  • The residential built environment of this country is arguably the least energy efficient in the developed world.
  • The weather envelopes of our residential buildings are so porous to the passage of thermal energy - 80% of the energy we put into those building systems remember - that they fire hose thermal energy out almost faster than one can put it in.
  • Our residential buildings are the literal energy equivalent of driving the family car 24-hours a day with multiple holes punched into the fuel tank.
  • The residential building energy efficiency standard across the EU is about to become the German PassivHaus standard which makes PlusEnergy buildings quite possible with the addition of renewables based active systems - solar PV, solar thermal, daylighting and biomass fired heating. We are in the stone age by comparison.
  • We then attempt to heat these buildings with inadequate systems that can barely keep up with the heat loss through the weather envelope.
  • The very worst of these heating systems is the good old Kiwi log- burner - the Model T Ford of wood fired heating appliances.
    These appliances and their centuries old design principles combine the worst aspects a superseded technology. Incomplete combustion in a single combustion chamber due to lack of sufficient primary oxygen leads to incredibly poor thermal conversion of available calorific value in the fuel load and astonishing levels of local air pollution because of the immediate release from the flue of uncombusted but combustable gases and particulates - smoke.
    In addition, because of the crude radiant + air-to-air heat exchange mechanisms utilised by the design, the Kiwi log-burner is appallingly inefficient in thermal energy capture when compared to the pumped water jacket heat exchange system of a wood gasification boiler.
  • Not sure about this? Then ask yourself why a triple-tube/double- ventilated-cavity flue system is required. Answer: to prevent the heat that should be heating your home and heating your shower water, from setting your roof on fire instead as it is flushed out into the night sky through the thermal energy super highway coming out the top of that steel box. Billowing smoke churning from the flue and circa 30-40% efficient at best compared to 96% efficiency for a wood gasification boiler emitting negligible gaseous or particulate pollution.
  • Why is a pumped water heat exchanger so much more efficient? It is as simple as energy density and thermal gradient. Air and water are both fluids but water is 800 times the density of air and so has vastly superior thermal conductivity, storage and transport capability. In addition, once the air in the single room being heated by the log burner has been warmed the box is trying to get its heat output across a shallower thermal gradient. This results in overheating and efficiency reduction. The water in the pumped thermal transfer loop of a boiler always returns from the buffer tank substantially cooled and so a steep thermal gradient is maintained resulting in far superior thermal transfer at the heat source.
  • The log burner also obviates the possibility of central heating and household water heating when those tasks are integral to the role of a modern wood fired boiler in Europe.
  • New Zealand local consent authorities do seem to comprehend some of the shortcomings of the log-burner. They certainly understand they produce significant air pollution. What they do not seem to understand is why. Nor are they even vaguely aware that there are literally dozens of huge companies in Europe who do understand why and have developed the ultra clean burning replacement for them decades ago - the wood gasification boiler.
  • There are no restrictions in Europe as to where these appliances can be installed, yet here in New Zealand, for the most part, one cannot install one at all, even though to do so would allow a family to centrally heat their home with cheap biomass, achieve close control over the temperature of each room or zone, supply household hot water and dramatically lower flue gas and particulate emissions when compared to the standard Log- burner - or to the new allegedly “clean air” log burners now being offered.
  • Combine one of these boilers with some retrofitted energy efficiency measures in the building itself and the amount of wood burned can be dramatically reduced as well.
  • Because our legislators apparently do not know about any of this they are currently busying themselves effectively regulating wood fired home heating appliances out of existence and insisting we turn to electricity consuming heat pumps instead. Not energy efficient ground-source (water to water) heat pumps mind you, but the cheap and nasty, far less effective and far more energy hungry single-room air source (air to air) heat pumps we think are all there is.
  • Just where these geniuses think we are going to find the extra electricity to charge the batteries of a whole new national fleet of E-vehicles when we are all using all the electricity our rapidly drying out hydro lakes can produce to run heat pumps to heat our energy colander homes because we will have made heating by wood all but illegal I can’t quite discern just now. Personally, I think we need to utilise every viable renewable energy source we can find and integrate them all into a rational and planned national strategic energy policy ... but the experts know best I suppose.

Those interested enough in these musings to want to learn more about the astonishing level of maturity and sophistication of the biomass industry and the market and appliances overseas, as well as what it is that makes our homes so appallingly energy inefficient, may care to open and read the longer Wilding Pines Submission version that is attached here. Also attached here you will find information, which I can’t commend to you strongly enough, prepared by Brian Anderson of Christchurch based Bryn Martin Consulting Engineers who is vitally interested in these matters as well and has done some exemplary investigative work on the absurdly invalid, so called “clean air regulations” and how their utterly improbable outcome is to make impossible the installation of the latest generation of truly clean burning wood fired appliances here in New Zealand where they are needed so desperately.

A closing teaser to tempt you to investigate further and perhaps take some action: how big is this stuff really getting elsewhere? A recently commissioned pellet plant in the US is processing 30,000 tons a day of forestry waste and other materials. Yes these are the same pellets we buy at Mitre 10 in 20kg bags. They are shipped across the Atlantic in bulk ore carriers and used to fire power stations that have been converted from coal to biomass as their combustible fuel source. Coming soon to a location near you ... biomass fired energy production systems. All that need happen is for you to call your local member and tell him to get his absurd regulations the hell out of your way.

Disclaimer: Personal views expressed in this blog are those of the writers and do not necessarily represent those of the NZ Farm Forestry Association.

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