Surveying fuelwood consumption in Finland

Transcription

1 Surveying fuelwood consumption in Finland UNECE/FAO Joint Wood Energy Enquiry Capacity Building Workshop: Improving wood energy data for better policy making Paris, June 2012 Esa Ylitalo METLA, Forest Statistics

2 Contents 1. Wood fuel consumption in Finland (figure) 2. Metla s statistics on Solid wood fuels in heating and power plants General facts Classification of data 3. Metla s statistics on Fuelwood consumption in small scale housing Background Content, data and methods of the latest survey (heating season 2007/2008) Data estimation between survey periods Costs of the latest survey 4. Wood fuel statistics in Finland contribution to JWEE

3 Wood fuel consumption in Finland Energy consumption in Finland by source of energy, 2011 (preliminary data) Sources: OSF: Statistics Finland; OSF: Finnish Forest Research Institute

4 Solid wood fuels in heating and power plants (1) General facts: the statistics cover nearly all energy plants using solid wood fuels in Finland: industrial energy plants (especially the forest industries) energy plants, outside industry small energy plants managed by heat entrepreneurs large sized buildings (schools, industrial halls, retirement homes, etc.) in 2011, the statistics covered approx energy plants (total population) register of energy plants is updated with continuous and intensive media monitoring data are collected annually (Jan Apr, published at the end of April) data on the smallest plants are requested at 3 5 yearly intervals (in 2011, the share of these plants was approx. 0.3% of total consumption) mailed enquiry (2 rounds); questionnaire is also available in the internet regional breakdown in data collection: municipalities=>results presented for the whole country, forestry centres (14) and provinces (19)

5 Solid wood fuels in heating and power plants (2) Classification of data: 1. Consumption of solidwood fuels by assortment (scum, MWh) forest chips forest industry by products and wood residues industrial chips sawdust, cutter shawings, grinding dust, etc. bark recycled wood demolition wood wood pellets and briquettes other

6 Solid wood fuels in heating and power plants (3) Classification of data: 2. Origin of forest chips (rawmaterial; scum) small sized trees pruned small diameter stems unpruned pulpwood large sized timber (rejected sawn timber) logging residues (branches and canopies) stumps and roots 3. Consumption of imported forest chips (scum)

7 Fuelwood consumption in small scale housing (1) Background: the focus of the survey is to find out the volumes of fuelwood consumed in smallscale housing by: tree species and assortment (roundwood, wood residues, other) type of small scale house type of burning device small scale houses: detached houses, agricultural buildings, holiday homes, saunas, etc. the survey is carried out between 5 10 years' intervals (9 estimates since 1930 s) fuelwood volumes have changed slowly and studies are expensive to carry out in addition to energy statistics, the survey also provides input data to statistics on: wood consumption roundwood removals and drain stumpage earnings cutting possibilities

8 Fuelwood consumption in small scale housing (2) Content, data and methods of the latest survey (heating season 2007/2008) total amount of real estates (1.4 mill.), as well as samples were extracted from the database of the Population Register Centre new method applied: stratified sampling, by the type of the main building on the real estate (=type of a small scale house), was used to decrease costs and size of sample, also to increase the accuracy of results sample properties; sample ratio in stratums 1/20 1/600 (average 1/175)

9 Fuelwood consumption in small scale housing (3) Content, data and methods of the latest survey (heating season 2007/2008) mailed enquiry (2 rounds); respondents (51%) sample of non respondents (loss inquiry; 10% or 400), by telephone total number of respondents (56%) missing data (wood consumption!) inquired by telephone collected by municipality; published to the whole country, forestry centres and provinces confidence interval (95%): 6,7 +/ 0,6 mill. m 3 / year coefficient of variation (V=s/x): 4%

10 Fuelwood consumption in small scale housing (4) Data estimation between survey periods in Metla s statistics (roundwood consumption, etc.), the results (m³) remain unchanged until a new survey will be carried out Statistics Finland converts the volume data into energy content (J = joule) between survey periods, Statistics Finland annually updates the energy content based on their model. Affecting factors of the model are: annual changes in building stock register annual changes of temperature during heating period: degree day factor estimate of wood fuel consumption in commercial and office buildings, etc., is also included results are annually presented in Finland s Energy Statistics for the whole country only

11 Fuelwood consumption in small scale housing (5) Costs of the latest survey: salaries (a research forester, assistants) material (basic population and sampling) questionnaires and mailing data input and processing other Total: Duration of the survey : 1,5 2 years

12 4. Wood fuel statistics in Finland contribution to JWEE the Finnish reply to JWEE 2011 jointly prepared by Metla and Statistics Finland (country correspondent: Esa Ylitalo, Metla) Metla produces figures presented in Table I (Fibre sources) and Table II (Processed wood based fuels) Statistics Finland is responsible for the figures presented in Table IV (Energy use) the basic population of heating and power plants differs slightly between these statistics (solid wood fuels) the deadline of JWEE 2011 is too tight: Finnish data available in early February of 2013 the contents of JWEE should be developed towards clearer direction attention must be paid to the quality of the pre filled data JWEE annually?

13 Thank you