European Climatic Energy Mixes

The European Climatic Energy Mixes (ECEM) proof-of-concept model was successfully completed in March 2018. Combining the efforts undertaken for the ECEM and CLIM4ENERGY demonstrators, this is now moving into an operational phase and a new system is being developed as part of the C3S Energy project.

The energy sector is undergoing a major transformation. The established model of traditional thermal power plants providing most of the ‘firm’ power to match a variable demand is being challenged by the steadily increasing share of power supply from variable renewable energy (RE) sources, such as wind and solar. Demand variability is also increasing as a result of the widespread use of embedded small-scale generation (e.g., rooftop solar) and air-conditioning, and can further change in response to price signals, and to an ever-changing climate. At the same time, the cost of batteries has started to noticeably decrease, making electrical storage increasingly economically viable.

Energy companies and operators, such as TSOs, and energy policy makers will benefit from the co-designed climate service demonstrator as it will include a set of tools for better assessing energy mix options over Europe. Importantly, the demonstrator will:

  1. Ensure that the country energy mixes properly reflect climate conditions including their variability, and it will therefore allow end-users to better assess the optimal supply mix that can meet demand in the most cost effective manner;
  2. Offer a coherent approach for the climate variables/indicators used in power demand/supply balance, an added value with respect to current practice in the sector, where climate data and derived ESCIIs are not always physically homogeneous and/or in balance

This transformation in the energy sector is taking place against a variable and changing climate. Given the weather-and climate-dependency of both RE and demand (even in the case of large storage uptake), it is important to develop this robust climate-based tool to advise energy planners and policy makers.


WEMC was instrumental in shaping the European Climatic Energy Mixes (ECEM), a EU Copernicus Climate Service project.

European Climatic Energy Mixes (ECEM) aims to produce, in close collaboration with prospective users, a proof-of-concept climate service – or demonstrator. Its purpose is to enable the energy industry and policy makers to assess how well different energy supply mixes in Europe will meet demand, over different time horizons (from seasonal to long-term decadal planning), focusing on the role climate has on the mixes.

This 27-month EU Copernicus Climate Change Service project started in November 2015 and is led by the University of East Anglia (UEA, UK) in collaboration with Electricité De France (EDF, France), the Met Office (UK), ARMINES (France), the University of Reading (UK) and the Agency for new technologies, energy and sustainable development (ENEA, Italy).

If you are working in the Energy domain, in charge of anticipating the transformation of the sector, through either long-term planning or medium-term operational activities, and Climate affects your decisions, then you may find the output of ECEM useful for your activities. More specifically, the project will be dealing with a variety of Energy-related issues which influence Energy mixes such as the role of temperature on thermal plant efficiency, or the variability of renewable energies, or the climate-related variability in demand. If these issues sound familiar or interesting to you we would like to hear from you so you can help us shape one of the first European Climate Services for the Energy Sector: we would very much welcome your contribution!


Use the proof of concept online demonstrator


Overview talk of the ECEM project

Presentation by Alberto Troccoli at the ECEM 1st Stakeholder Workshop, Paris, 16 February 2016

To get involved or request more information please email: Prof. Alberto Troccoli: or visit Copernicus ECEM.


Explore how climate may affect future European energy demand and supply with the updated C3S ECEM Demonstrator

16 January 2018


Youtube link



Discover the C3S ECEM energy data for the European energy sector

20 November 2017 14.00 to 15.15 UTC (15.00 to 16.15 CET)  



Discover the C3S ECEM climate data for the European energy sector

18 October 2017 09.00 UTC (10.00 UK BST)  

This webinar addresses the subjects of climate variables, seasonal forecasting and the C3S ECEM Demonstrator in relation to the European energy sector



Explore how climate affects European energy demand and supply with the new C3S ECEM Demonstrator 

22 September 2017 10.00 UTC (11.00 UK BST) 

This webinar introduces the Copernicus Climate Change Service (C3S) European Climatic Energy Mixes (ECEM) Demonstrator designed to assess how well different energy supply mixes in Europe will meet demand over different time horizons focusing on the role of climate.



Climate variables today and tomorrow – using climate to better operate and plan future energy systems

14 December 2016

Organised by the C3S ECEM, this webinar was divided into two presentations of 20 minutes each, the first addressing the adjustment of historical climate data for energy and the second showing how to use historical records to adjust climate projections for energy.

  1. ERA-Interim biases and how ERA-Interim can be bias adjusted using a distributional-based scaling procedure – Prof. Phil Jones (University of East Anglia, UEA, UK)
  2. Calibrated climate projections for energy – Dr Robert Vautard (LSCE, France)

The two presentations were followed by a 20-minute Q&A session

Morning broadcast chaired by Dr Laurent Dubus (Electricité de France, EDF, France) webinar video


Afternoon broadcast chaired by Prof. Alberto Troccoli (UEA & World Energy & Meteorology Council, WEMC, UK)

Youtube link



Making the most of ERA-Interim Reanalysis for Wind and Solar Power

22 September 2016

Reanalyses, reconstructions of the past climate using a blending of observations with a physical model, are very useful tools for filling gaps where there is sparsity of observations. This is particularly true for wind and solar observations, the essential ingredients for the computation of wind and solar resource assessment, respectively. With this webinar first an overview of a very popular reanalysis, ERA-Interim, is provided. This will be followed by assessments of the quality of ERA-Interim when used as surrogate for wind and solar observations.

Sessions chaired by Laurent Dubus (EDF) and Alberto Troccoli (UEA & WEMC)

  1. Hans Hersbach (ECMWF) – Overview of ERA-Interim
  2. Gil Lizcano (Vortex) – Assessment of ERA-Interim winds
  3. Lucien Wald (Mines-Paris Tech/ARMINES) – Assessment of ERA-Interim solar radiation


Youtube link


A climate service demonstrator comprising a set of tools, including an online web interface, for improved assessment of energy mix options over Europe has been co-developed from scratch with extensive input from prospective users engaged through expert elicitation workshops and direct contacts. The main purpose of the proof-of-concept C3S ECEM Demonstrator is to enable the energy industry and policy makers to assess how well energy supply will meet demand in Europe over different time horizons, focusing on the role climate has on energy supply and demand.

The C3S ECEM Demonstrator gives you the capability to explore high-quality climate and energy data sets and to easily:

  1. Produce maps and time series plots of these climate and energy variables,
  2. Modify the appearance of these maps and plots, and
  3. Download the underlying data and/or the maps and plots
  4. Access the abundant documentation, including Variable Fact SheetsEvent Case StudiesKey Messages and much more (see bottom left hand side of the visual demonstrator, following the link below)

We would like to invite you to test the

C3S ECEM demonstrator

 and we look forward to your feedback!

(open feedback form by clicking on the tab on the right hand side of the C3S ECEM demonstrator)


Advancing climate services for the European renewable energy sector through capacity building and user engagement (2019) Climate Services, 16, 191–205
Authors: Goodess C, Troccoli A, Acton C, Añel JA L, Bett PE, Brayshaw D, De Felice M, Dorling S, Dubus L, Penny L, Percy B, Ranchin T, Thomas C, Trolliet M, Wald L

A climate projection dataset tailored for the European energy sector (2019) Climate Services, 16
Authors: Bartók B, Tobin I, Vautard R, Vrac M, Jin X, Levavasseurc G, Denvilc S, Dubus L, Parey S, Michelangeli PA, Troccoli A, Saint-Drenan YM

Creating a proof-of-concept climate service to assess future renewable energy mixes in Europe: An overview of the C3S ECEM project (2018) Adv. Sci. Res., 15, 191–205
Authors: Troccoli A, Goodess C, Jones P, Penny L, Dorling S, Harpham C, Dubus L, Parey S, Claudel S, Khong D-H, Bett PE, Thornton H, Ranchin T, Wald L, Saint-Drenan Y-M, De Felice M, Brayshaw D, Suckling E, Percy B and Blower J

An approach for the estimation of the aggregated photovoltaic power generated in several European countries from meteorological data (2018) Advances in Science and Research, 15, 51-62
Authors: Saint-Drenan YM, Wald L, Ranchin T, Dubus L, Troccoli A

Using ERA-Interim Reanalysis output for creating datasets of energy-relevant climate variables (2017) Earth System Science Data Discussions, 9, pp. 471-495
Authors: Jones PD, Harpham C, Troccoli A, Gschwind B, Ranchin T, Wald L, Goodess CM and Dorling S



Download the ECEM 2nd Stakeholder Workshop Flyer (please scroll down to download presentations)
Download the ECEM 1st Stakeholder Workshop Flyer
Download the ECEM Pitch Presentation
Download the ECEM Poster


Presentations at the 2nd ECEM Stakeholder Workshop

ECEM Presentations:
Introduction – Alberto Troccoli
Climate Variables – Phil Jones
Energy Variables – Laurent Dubus
Case Studies – David Brayshaw
Demonstrator – Clare Goodess and Jon Blower