Concrete Core Activation in the Company Building – Annual Report 2024

The era of high feed-in tariffs for photovoltaic electricity is over – as demonstrated by the irreversible shift toward higher self-consumption through thermal applications in private homes, such as using photovoltaic electricity for hot water production or heating support.

my-PV also observes this reduction in feed-in remuneration in the annual operating costs: despite rising electricity prices in 2024, the evaluation once again demonstrates how sustainable and economical the solar-electric building technology in our company building operates. Since the commissioning of the first solar-electric company building in 2021, my-PV has published a detailed annual analysis of energy usage, energy sources, and photovoltaic surplus – an overview can be found on the page for the solar-electric company building.

Development of Operating Costs

The first evaluation for the period from November 2021 to October 2022 showed a pleasing financial surplus in the five-figure range. However, in the following year, 2023, the average feed-in tariff dropped from around 30 cents to 15 cents per kilowatt-hour, resulting in initial operating costs of €405.

This trend continued in 2024: due to a further reduction in the feed-in tariff to an average of only 6 cents per kilowatt-hour, the electricity costs for our building totaled €11,840. However, considering that this amount covers all energy sectors – from operational electricity to space heating, hot water, and e-mobility – the costs remain at an impressively low level.

Energy Consumption in Detail

The continuous growth of my-PV also impacted energy consumption in 2024. While the heating demand for space heating was reduced by approximately 1,000 kWh compared to the previous year, electricity consumption in other areas increased significantly. General operational electricity, which also includes cooling and ventilation, rose by 7,700 kWh. This increase is primarily due to company growth (additional employees through new hires in the company building, leading to more equipment) as well as intensive product testing (with continuous operation under energy-intensive extreme conditions).

Hot water demand also rose by 700 kWh due to the increase in staff. However, the largest increase was observed in e-mobility. Since my-PV provides free charging for employees in the parking areas and the company fleet has expanded, consumption in this sector increased from 14,700 kWh to 26,000 kWh.

Energy Self-Sufficiency Continues to Be Exceeded

Despite the increased energy demand, the solar-electric company building once again achieved net energy self-sufficiency in 2024 – reaching an impressive 119%. Almost half of the total energy demand (45%) was directly covered by the in-house PV system. “Directly” means without a fixed battery storage installed in the building.

By increasing self-consumption by 5% to 41%, approximately 7,000 kWh less energy was fed into the grid compared to the previous year. Especially in times of low feed-in tariffs or possible feed-in restrictions, this demonstrates how essential high self-consumption is.

my-PV products offer a simple and cost-effective way to increase self-consumption by capturing and precisely controlling excess energy down to the second – both for hot water production and for solar-electric heating via core activation with heating wires. The continuously adjustable power regulation enables efficient, low-loss use of PV surplus.

Conclusion: Future-Ready Building Technology in Action

The 2024 operational year once again confirms the advantages of a solar-electric building concept. Compared to conventional building technologies, my-PV’s company building stands out with lower investment costs and minimal ongoing effort: only €11,840 were required for the entire energy demand – including electricity, hot water, space heating, and e-mobility.

Another advantage: heat generation is completely maintenance-free, silent, and without moving parts. The motto “Cables Instead of Pipes” not only simplifies installation but also reduces operational complexity.

Once again, solar-electric building technology has proven to be the ideal solution for low-energy buildings – cost-effective, efficient, and environmentally friendly!