Spain's solar power boom has been a topic of concern for investors, with headlines suggesting a 'bust' in the industry. However, the reality is more nuanced. While low consumer prices and a glut of electricity have led to some solar farms devaluing, the broader picture is more positive. Spain's renewable energy expansion is shielding the country from volatile fossil fuel prices, and its per capita emissions are below the EU average. The merit order principle ensures that electricity prices remain high despite investment in renewables, and Spanish bill payers are avoiding costs of around €10 per month. However, the issue of negative electricity prices and the resulting lower returns on solar farms is a real concern. Spain recorded 397 hours of negative electricity prices between January and March, and unlike other markets, Spanish law doesn't legally oblige the grid operator to compensate generators when they are forced to reduce output. This means investors will be seeing less return on their solar farms. To tackle this, UNEF suggests introducing a price floor and a price ceiling, similar to the mechanism used under the 'Iberian exception'. They also call for technical curtailments to be compensated at market prices and for the social tariff contribution to be calculated as a proportion of the revenues earned by each plant. While the business case for solar is weaker, batteries present a solution, allowing both households and solar farms to store energy produced during the day for citizens to use later in the evening. This would help even out Spain's energy consumption and reduce the amount of negative electricity prices. In the last 10 years, battery costs have plummeted by 85 per cent, making them a much more affordable solution. The European Commission approved €200 million in Spanish State aid last year to accelerate the green transition, including aid for investments in 'all renewable energy sources as well as energy storage'. However, it will take time for the technology to roll out on a large scale. Another important solution is to create more demand at times of high renewables output, either by shifting existing demand in time, or creating new demand through smart electrification. Around 99 per cent of Spanish households already have a smart meter, making demand flexibility much easier. According to Ember estimates, smart charging EVs alone would have the potential to absorb around three per cent of peak hourly wind and solar generation in Spain. The problem is that, at the moment, components of people's electricity tariffs are partially linked to electricity market prices, which encourages consumption during low price, high solar hours. This prevents consumers from taking full advantage of periods with cheaper and more abundant energy and reduces the overall efficiency of the system. Greece has already confronted this issue, by introducing legislation that will allow households to access reduced electricity prices during specific daytime hours when production is abundant. In the UK, the government is considering providing free or discounted electricity during these peak times to avoid strain on the grid. Spain's race to electrification is expected to support new electricity demand from sectors such as industry and data centres, which investors are viewing 'very positively'. As a result, the vast majority intend to continue moving forward with their projects. The energy transition needs electricity demand to increase, as electrification becomes the most efficient way to decarbonise. At the moment, Spain's energy consumption is barely budging, with demand in 2025 only two per cent higher than in 2024 and still lower than before the COVID pandemic. However, the more the country moves towards electrification, the more consumers will be able to take advantage of Spain's cheap solar and prevent it from being wasted. With its increasingly renewable, competitive, homegrown electricity supply, Spain is perfectly placed to electrify.
