Everything About Wood

By Bruno Prior, MD Forever Fuels and WHA Director. As the proportion of renewable energy in the united kingdom increases, the question of storage becomes more important. This is not merely an issue for electricity. Actually, it is more challenging to match the production of renewable energy to the demand for heat than to the demand for electricity.

Demand for electricity comes after fairly predictable patterns. Each day at breakfast and tea-time There are two peaks, your day and a trough at night with a plateau in the middle of. Week Weekend demand is a little lower than through the working. And demand is somewhat higher in winter than in summer.

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Demand for warmth depends on the weather. It varies far more than the demand for electricity from summer to winter. In addition, it varies more from one year to some other. From day to day, and week to week And it varies dramatically. Weather patterns do not follow convenient diurnal cycles. The total demand for warmth is also much higher than the full total demand for electricity. The disparity was illustrated in a chart produced by Dr Robert Sansom of Imperial College.

The graph shows synthesised half-hourly warmth demand (in red) and half-hourly electricity demand (in gray) this year 2010. The heat demand is synthesized because there are no statistics available for nationwide half-hourly high-temperature demand. Dr. Sansom developed a technique to estimate the half-hourly warmth demand, predicated on gas and weather data. The technique and data look credible and have been relied upon in policy circles broadly.

In the situation of electricity, the challenge of balancing supply and demand consists mainly of smoothing intermittent output to match predictable demand. In the entire case of heat, if intermittent kinds of renewable energy are used, there’s a double challenge, coordinating adjustable energy creation to heat up demand that varies broadly but not in sync with the creation also. There is not much that you can do about the weather and the patterns of heat demand.

The scale of the challenge to match supply and demand for warmth, therefore, depends on the total amount of technology used to provide heat. Dispatchability is important for electricity but indispensable for heat. Biogas needs to be produced continuously. Our gas storage is relatively limited: sufficient for about 6% of annual demand, or about 7 days of peak winter demand. And the utmost rate that that storage space can release its gas is sufficient to meet 38% of peak winter demand on chilly days. As the supply of biogas cannot be assorted like the supply of natural gas, a rise in the share of biomass in the grid would need a matching upsurge in the amount of gas storage.