In a situation where you need to use temporary power, you typically use a diesel powered generator. 99% of generators run at a constant speed and burn diesel according to the load. This is inherently pretty inefficient; as a rule of thumb an engine converts a third of what it burns to heat, a third to noise and a third to usable power.
Most generators are grossly over-sized because the required generator output is calculated by rough estimates and it’s the size you’ve always used, plus you don’t really know what size you need- you can’t, right? Wrong, you can!
Most site loads vary between peak and base by a factor of 5-10 but fuel consumption varies by much less. This means you are wasting fuel for the majority of the time.
Diesel generators are designed to be at their most efficient when at 75% load: most kWh per litre of fuel and least emissions per kWh, but because they are often oversized and spend 90% of their time at lower loads, their efficiency is dreadful. So you’re wasting money as well as belching out CO2, Nitrous Oxides (NOX) and diesel particulates. Your neighbours will be none too pleased either, at the noise during the night and over the weekend. NOX and PMs cause lung disease and kill 40,000 people per year in the UK alone costing the NHS £20 billion per year. How does that sit with your health and safety policy?
Any site with a diesel generator is emitting dangerous gasses which are bad for the environment, bad for people’s health and bad for your business.
ESS means the diesel generator can be smaller and can be switched off about 60% of the time, night times and weekends.