NZEB + EV: The decarb combo

Are you aware of these stats?

  1. Buildings account for 40 % of energy consumption and 36 % of energy emissions (EU data)
  2. Road transport accounts for 25 % of energy consumption and 20 % of energy emissions (EU data and EU stats)

Then, what happens when we combine NZEB buildings (net Zero Energy Buildings) with local renewable generation and EVs (Electric Vehicles) charging in these NZEB?

NZEB & EV.png

It’s obvious… -> We can decarbonize 65 % of the energy system!* Sigue leyendo

The grid as an emergency supply?

It’s official. Finally Spain has the most toll-intensive consumer power generation (what is called self-consumption) law in the world. The so-called “sun tax” is in place.

It is important to understand the worries of the regulator here;

Given the high fixed costs of the system, further reductions of electricity demand (as with self-consumption) increase the price of energy in a Grid independence cycle. The goal of increasing the toll on self-consumption is to ensure the system costs are covered, delay the implementation of self-consumption (starting in the islands and small systems), delay consumer energy storage (in fact it is also a “battery tax”) and (try to) avoid further political problems. Of course, it is not the best solution, academics and regulatory experts agree that politically fixed costs that have to be paid by all citizens shouldn’t be in the tariff but evenly paid from the nation’s bugdet (like the extra-costs for electricity in the islands).

Image by Cancia Leirissa on

“Grid Emergency Exit”                                                       Image by Cancia Leirissa on

What are the consequences? Rising prices, and the fact that fixed costs (for the contracted power) are surging, push the active consumer to look for the following solutions:

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Smart Grid Reliability! …or Efficiency?

One of the main benefits of the Smart Grid is increased reliability. Investing in Smart Grid technologies that improve reliability may have a good benefit-to-cost ratio or not, it will depend on the value of the improvement and the avoided outage or interruption costs. Examples of such technologies are; automatic outage restoration systems, Wide Area Monitoring, energy storage at distribution level, geographic information maintenance systems, advanced protection systems, etc.

The cost to improve reliability follows an somewhat exponential curve, as having a 100% reliable system is close to impossible, the cost is close to infinite. This leads to an asymptotic curve towards the end. Something like this:

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From 0 to 5-star Microgrids

Every building, office or home is a microgrid.

The question is, how good a microgrid do you want it to be?

Here is a simple 5-star rating for microgrids, an approach for anyone to understand;

You get one star for adding each of the following technologies:

1. Control

2. Generation

3. Electric Vehicle charging

4. Energy Storage

5. Microgrid Islanding functionality

Star Microgrid

A normal 0-star microgrid is a conventional building or home, with no automation or else.

It happens you upgraded your home and installed a smart thermostat for electric heating/cooling? Sigue leyendo

II Congreso Smart Grids, Madrid

Organizado por: Grupo Tecmared, Futured, AFME, Promovido por Eseficiencia y Esmartcity

Lugar y fecha: Ifema Madrid, 27-28 de Octubre 2014

Web del congreso:


Para este evento, presentaba desde ABB un artículo sobre rehabilitación energética orientada a tecnologías smartgrid. Tecnologías como el autoconsumo, los sistemas de automatización de edificios o los puestos de carga de vehículo eléctrico en parking de edificios de oficinas. Como ya he discutido anteriormente en el blog, la automatización de edificios es una de las mejores inversiones en smart grids. El ejemplo del edificio de ABB en Madrid, con estas tecnologías implementadas recientemente sirvió como muestra de los impactos positivos de eficiencia energética.

El artículo está colgado online en el siguiente link.