Batteries raise the price of electricity by at least 40 stotinki per kilowatt-hour

The world’s largest lithium-ion battery, manufactured by Tesla, near the Australian city of Jamestown. It was inaugurated on December 1, 2017. PHOTO: Reuters

6,000 seats must also be found in the country to which deploy and change every 10 years

It costs between 40 and 60 cents per kilowatt hour to pass current through a battery – charge it, and then discharge it. This was said for 24 Chasa by Dr. Blagoy Burdin, Chief Assistant at the Institute of Electrochemistry and Energy Systems at the Bulgarian Academy of Sciences.

Batteries are expensive, even if you have zero value of electricity, their use will raise the price per kilowatt-hour, says the scientist.

“Last time I watched a 3-megawatt Tesla battery, it was priced at $ 1.3 million without VAT for the United States.” In BGN it will be about 2 million, or it will be about 600 000 -700 000 BGN for storage capacity of 1 megawatt hour. This will be difficult to beat in terms of price, Burdin believes.

BGN 1.5 billion are provided in the Bulgarian recovery plan for storing 6,000 megawatt-hours of electricity in batteries. This should happen by 2026. According to Deputy Prime Minister Asen Vassilev

the batteries will

produce in

Bulgaria to

is guaranteed

the national


However, if someone wants to build a plant for this, he has to finance it himself, there is no money in the plan for it.

The batteries will be owned by a state-owned company under the auspices of the Bulgarian Energy Holding. The idea is for this company to offer an electricity storage service and for it to be used by as many producers as possible.

However, according to the expert, between the fifth and eighth year, these batteries, if they are lithium-ion, must be replaced, because each has about 1,500 charging cycles.

Burdin says it is not clear which batteries in the recovery plan are stationary or mobile, because the technologies were different.

According to the expert, it is not justified to make a large current storage system, and if they are many and evenly distributed, their position must be determined, characteristics, who will make them.

A 1 megawatt-hour storage battery is the size of a one-ton container. This means that 6,000 of them will be installed in different places in the country.

In Germany, there were batteries for 2.5 gigawatt hours, of which 3/4 were installed by end users. Usually a household has solar panels on the roof, and in the basement – batteries. Thus, the storage installations were quite well distributed in the network and this helped the regulation.

The first industrial battery to store electricity was at Tesla in Australia for 100 megawatt hours, but that was five years ago. Since then, things have developed, commented the executive director of the Electricity System Operator Angelin Tsachev.

According to him, the batteries

have a place like

technology for


current, in shorter


For long-term storage, one should rather think of pump-storage units and electrolyzers for hydrogen production. The right approach was to work in all three directions.

The capacity of Chaira SHPP, for example, is about 800 megawatts, and the storage capacity is about 6000 megawatt hours. The expansion could increase it to 11,000 – 12,000 megawatt hours and will work for 100 years, says Burdin.

Lithium metal phosphate batteries are currently a hit. It is believed that they are currently the best, have a life of about 10 years, or 3000 cycles of charging and discharging, said Angelin Tsachev. There are also lead batteries that have the shortest life, but they have the lowest price and recycling technology is very cheap.

For both, there had to be a decision on how to proceed after the end of the service life, because at that time there was no technology for their recycling.

The projections in the recovery plan are


for batteries

to be




or to generation facilities in order to facilitate their connection to the transmission network.

As single capacities there are batteries up to 2 megawatt hours, and the most commonly used is up to 1 megawatt hour in a 40-foot container.

6000 megawatt hours capacity depending on battery technology can be discharged and charged within 2, 4, 6 or 12 hours. The optimal time was 4 or 6 hours. 6000 megawatt hours of batteries, if installed in our country, must give or charge from 1500 megawatts of power in one hour.

According to the head of the Electricity System Operator, serious research is needed before the construction of batteries can begin, but they would certainly diversify the possibilities of renewable energy producers to store it.


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