Underlines the potential of smart grids, demand side management tools and energy storage solutions, both to facilitate the best possible integration of RES-E and to even out grid fluctuations; re-emphasises the urgent need for further research into, and deployment of, electricity storage including on the basis of cooperation with pumped-storage hydroelectric plants; notes in particular the need for further research into variable-speed storage options, which offer a more flexible system for controlling storage speeds and thus facilitate faster and better-matching connections; calls on the Member States to avoid imposing a double tax bu ...[+++]rden on electricity storage operators;

Usually a unit, with V max = 100 km/h and fitted with a variable relay is designed to obtain λ = 100 % up to 14,5 t/axle.

For single-speed beltweighers, and variable-speed beltweighers having a manual speed setting control, the speed shall not vary by more than 5 % of the nominal value.

'A current of air of variable speed is blown over the vehicle.`

At the end of the first 40-second idling period (see 6.2.2) a current of air of variable speed shall be blown over the vehicle.

[12] It is worth adding that the nature and intensity of controls are often variable between Member States: daily monitoring of programming, statistical reports, surveys, sampling, estimates in some cases, etc. Furthermore, they may be carried out by the sector's independent regulatory authority or, in some cases, directly by the competent government department.