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Veselin Todorov sees coordination as key to Bulgaria’s solar progress

Bulgaria’s solar future – challenges, opportunities and the path forward

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Veselin Todorov, Chairman and Founder of Solar Academy Bulgaria, shares his perspective on the development of photovoltaics and energy storage in Bulgaria, the challenges facing the sector and the opportunities ahead.

The simpler the setup, the more modules find themselves leaving the premises

Solar Investors Guide #6 – Minimising risks

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Investing in solar parks, expansive rooftop systems and cutting-edge battery storage requires patience and a genuinely long-term outlook. Such projects are generally designed to run for twenty years or more, making it crucial to safeguard them against a broad spectrum of risks over their lifespan – an important issue that is still too often neglected.

FPAs (Flexibiliy Purchase Agreements) are taking vertical integration literally, tripling within a single year

23 GWh of battery storage secured via FPAs in 2025

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Market volatility and price cannibalisation are accelerating flexibility purchase agreements, while long-term PPAs are losing ground, according to Pexapark.

Visualisation only, but the real-world physics of hybrid renewable energy is equally dramatic

Hybrid PV and finance models take centre stage at Intersolar Europe

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Hybrid power plants combining PV with wind and battery storage are gaining ground across Europe and will feature prominently at the industry gathering in Munich from 23 to 25 June.

Price growth was most pronounced in full-black and BC modules

March PV Index – prices rise with early signs of correction

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March data of sun.store confirm that demand for solar components across the European PV market remained strong. Most module categories saw month-on-month price increases of four to six percent, while back-contact modules rose by ten percent.

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What is photovoltaics?

Photovoltaics (PV) refers to the generation of electrical energy from sunlight. At the heart of this process are the solar-active semiconductors known as solar cells, which capture sunlight and convert it directly into electricity.

From a technical standpoint, a PV system or solar installation functions as a generator. Here, individual solar cells are combined into a solar module, which is protected from the elements. These modules are then assembled into a larger solar generator, which can be mounted on rooftopsfaçadesopen ground or specially designed structures. The electricity generated is direct current (DC), which is converted into alternating current (AC) by an inverter. This AC power can be used directly on site or fed into the public grid via the building’s connection. The electricity is typically supplied to the local utility or grid operator.

Larger PV systems installed on open land are often called solar parks. These feed power into the grid via dedicated transformers and switchgear. In many countries special Acts and regulations govern remuneration for solar power, whether via feed-in tariffs or market premiums for direct sales to third parties.

Self-consumption can be increased by using solar power for heating waterroom heating, air conditioning or refrigeration. Battery storage systems help by storing surplus solar electricity for later use. These so-called solar batteries improve system reliability, especially when solar output dips.

Not all incoming sunlight is converted into electricity. The conversion rate depends on the intensity and wavelength of the incoming light spectrum. This ratio between usable electrical output and the maximum available solar radiation is known as efficiency.

The performance of a solar generator or storage system is defined by its output. When multiplied by the number of sunshine hours, this gives the solar yield – the amount of electricity generated per day, month or year. In addition to charging and discharging power, solar batteries are also rated by their capacity, or the amount of energy they can store. Power is measured in kilowatts (kW) or megawatts (MW), while energy and yield are expressed in kilowatt-hours (kWh) or megawatt-hours (MWh). (HS)