Renewable energy

Last week we went to the Palamos Marina to review the photovoltaic installation with battery of the rowing boat of the OCEANCATS team (https://oceancats.org/).

The physical battery stores kWh in a computer and allows you to move energy to evening/night and cut power peaks (backup included). The virtual battery saves €: monetize your surplus on the bill without installing anything. The choice depends on your load curve, peaks and budget; in many cases, the hybrid strategy (physical + virtual) maximizes savings.

The most common question is, “How many plates should I install?” It sounds easy, but it’s not answered by looking at your annual bills alone.

The ideal inclination for solar panels in Girona is 38º and the optimal orientation is towards the south (180º). If this is not possible, orienting them to the southeast (135º) or southwest (225º) hardly reduces production (1-3% less per year).

Fan convector heating combines high efficiency and versatility to air-condition any space. We explain how it works, how much it costs and why it is one of the most sustainable solutions on the market.

Although many people use “heat pump” and “aerothermal” as if they were the same, they are not. We explain their differences, what types exist, how much they consume and how to choose the system that best suits your home.

Installing solar panels in a community of neighbors is a profitable investment: it reduces the electricity bill, takes advantage of subsidies and pays for itself in a few years.

Current equipment maintains an efficiency (COP) of 3-5 even at sub-zero temperatures, which allows savings of up to 70% compared to gas or oil boilers. To optimize it in winter, good insulation, buffer tanks and, in very cold areas, a combination with solar panels or hybrid systems are recommended.

The price of installing aerothermal energy in 2025 ranges from €8,000 to €20,000, depending on the size of the house and the type of emitters. The investment is amortized in 5-7 years thanks to energy savings of 40-70 % compared to gas or oil, and can be reduced to only 3-4 years if subsidies are applied.

Learn how to join an energy community: locate projects, learn the requirements and start saving with shared renewable energy.

A Renewable Energy Community (REC) promotes local clean energy projects with social and environmental benefits. Find out how they differ from RECs.

In 2025, Spain will have 659 energy communities. We explain their growth, advantages and future in the energy transition.

Brief explanation of what an energy community is and why Girona is becoming a reference in collective self-consumption.

How much does aerothermal energy in Girona spend? We analyze real consumption in cold areas such as Olot and temperate areas such as the Costa Brava, with reference tables, comparison with gas and diesel, and tricks to reduce the bill, even with solar panels.

Is it worth installing aerothermal energy if you already have solar panels? We explain the best and the worst of this combination, how to get the most out of it and what to take into account to save more and live better with renewable energy.

Everything you need to know about hot water aerothermal: the best, the worst and how to integrate it with your solar installation. Practical and straightforward information.

Installing aerothermal in a house already built is possible, but its installation requires certain adjustments. Everything you need to consider to do it right.

Aerothermal heating is ideal for complete and efficient air conditioning all year round, while air conditioning is perfect for occasional cooling or heating needs.

A comprehensive guide to boosting the uptake of heat pumps, optimizing energy efficiency and reducing consumption.

Discover how the size of solar panels affects their efficiency and performance. Learn how to choose the ideal size to maximize power generation and optimize your solar installation.

Learn about the advantages of installing solar batteries in a photovoltaic system, and maximize the use of solar energy.