Logan Reid
Hospitals rely heavily on electricity to function properly, from lighting to medical equipment to advanced information technology. Hospitals have their own generators that will run in the event of a blackout. These generators are designed to power only the hospital and not the surrounding areas. In California, about 50% of people are connected to Block 50 and are unlikely to lose power unless the load shedding is extreme. Hospitals also have isolated power grids, which are particular types of power distribution used in critical care areas to protect patients and medical staff from the dangers of electric shock due to leakage currents during medical procedures.
| Characteristics | Values |
|---|---|
| Purpose of a hospital power grid | To protect patients and medical staff from the dangers of electric shock as a result of leakage currents (micro shocks) during certain medical procedures |
| Type of power distribution | Isolated power grid |
| Type of power source | Microgrids, backup generators, solar panels, wind turbines, green hydrogen |
| Benefits of microgrids | Can supply day-to-day power capacity, help hospitals achieve their cost and sustainability goals, and provide revenue opportunities |
| Drawbacks of backup generators | Require regular maintenance to ensure functionality in emergencies |
| Other benefits of hospital power grids | Hospitals can monitor and adjust energy use in real time to avoid overloading the system |
| Other drawbacks of hospital power grids | Require complex solutions to electrical problems caused by lack of maintenance, overloading of electrical systems, and issues with the external power grid |
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What You'll Learn
Hospitals have their own backup power generators
The law requires hospital backup generators to fully restore power within ten seconds of the initial outage. Any longer than that can cause serious harm to those on life support and may even result in the loss of life. Therefore, backup generators that prevent lost time due to electrical outages can prevent surgical complications and protect patients' lives. Additionally, many medical supplies require refrigeration to maintain their safety and stability. In the event of a power outage, a backup generator must turn on to prevent the refrigeration unit from raising the storage temperature of the medical supplies.
Hospital backup generators must adhere to strict standards set by the National Fire Protection Association (NFPA) Life Safety Code, or the NFPA 101. There are two hospital battery backup or backup generator categories based on code requirements: Level 1 and Level 2. Level 1 generator systems are mandatory if a facility losing its main power could cost people their lives. These generators typically power life support systems and other vital hospital equipment. Level 2 generators may not be directly related to keeping patients alive but may operate lighting and other features crucial to the hospital's overall operations.
Diesel generators are a popular choice for hospitals due to their versatility, sturdiness, and fuel efficiency. However, they require regular deliveries of diesel fuel and on-site storage, which has a limited shelf life. Alternatively, natural gas generators are quieter, burn fuel more cleanly, and can easily access fuel during emergencies by connecting to a main gas utility. Hospital facility managers must carefully consider factors such as size, fuel type, and location to choose the best generator model that meets their specific needs.
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Hospitals are connected to the electrical grid
In addition to feeders, hospitals may also have backup diesel generators, uninterruptible power supply (UPS) systems, or microgrids. Microgrids can be particularly useful in supplying hospitals with power during emergencies, such as natural disasters, and they can also help hospitals achieve their cost and sustainability goals.
Some hospitals have moved beyond diesel generators and instead use combined heat and power (CHP) plants, which are more efficient and cost-effective. These CHP plants can also be configured as microgrids, which can incorporate various distributed energy resources (DERs) such as solar panels, wind turbines, or fuel cells.
The electrical grid itself is also becoming smarter, with advanced technology being employed to monitor and manage the health of the grid, detect and prevent issues, and respond to power outages.
While hospitals are connected to the electrical grid, they are often prioritised for repairs in the event of a power outage due to their critical nature.
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Hospitals use a lot of electricity
Hospitals consume a significant amount of electricity, and this is driven by several factors. Firstly, the size and type of the hospital facility play a crucial role. Larger hospitals occupy more extensive physical spaces and have higher electricity demands to cater to various departments and a greater number of patients. According to the Commercial Buildings Energy Consumption Survey (CBECS), the average inpatient hospital in the US spans 247,000 square feet and consumes 31 kWh per square foot annually, amounting to 7.6 million kWh.
The age and geographical location of a hospital also influence its electricity usage. Older buildings may have less energy-efficient designs and technologies, leading to higher consumption. Different regions may also have varying energy requirements due to climate differences and the associated heating or cooling needs.
The primary uses of electricity in hospitals include ventilation, cooling, and lighting. These essential systems contribute significantly to the overall electricity consumption. Ventilation and air conditioning systems, in particular, are critical for maintaining comfortable and healthy indoor environments for patients, staff, and visitors. Medical equipment, such as CT scanners and ultrasound machines, also contribute to electricity usage in hospitals. These devices are often sophisticated and require a stable and reliable power supply to function optimally.
To ensure uninterrupted operations and maintain a reliable power supply, hospitals typically have backup generators. These generators can range from fuel oil generators to natural gas or propane-powered systems. In some cases, hospitals may have their own high-voltage feeders from local zone substations, ensuring they are not dependent on a single feeder or substation.
Hospitals' high electricity consumption has led to a focus on energy efficiency and cost reduction. Energy audits, demand management strategies, regular maintenance of HVAC systems, automation, lighting upgrades, and the utilization of natural lighting through skylights and atriums are some of the methods employed to reduce electricity bills and promote sustainable practices in healthcare facilities.
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Microgrids can supply power to hospitals during emergencies
Hospitals require a reliable supply of power during crisis situations, such as extreme weather events, which can result in power outages, leading to the cancellation of certain patient procedures. Microgrids are a viable solution to this problem, as they can keep hospitals running even when the emergency fuel supply runs out.
Microgrids work by generating energy through distributed energy resources (DERs), such as renewables and combined heat and power (CHP) systems. The energy generated is consumed by the load, and any excess energy is either sold to the grid or stored in batteries. A microgrid can also function as an island by disconnecting from the grid and distributing power locally.
For example, Bloom Energy provides hospitals with a fuel cell microgrid as a normal source of power, allowing hospitals to perform elective procedures even during grid outages. This also helps hospitals save on energy costs and prevents lost revenue due to short or long outages. Additionally, Bloom Energy's microgrid solutions can help hospitals reduce their carbon footprint by providing a substantial amount of power while reducing CO2 emissions.
PowerSecure is another company that specializes in designing, implementing, and managing microgrid systems tailored to meet the unique needs of its clients. Their microgrid solutions ensure uninterrupted power during extreme weather conditions and aid in swift recovery, allowing businesses to continue operations with minimal disruption.
In summary, microgrids are a reliable solution for hospitals to maintain power during emergencies, ensuring that patient procedures can continue as normal and helping to prevent revenue losses and health risks associated with unplanned outages.
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Hospitals have isolated power grids to prevent electric shock
Hospitals have unique power requirements that differ from those of typical residential or commercial buildings. They require a constant and reliable source of electricity to power essential medical equipment and life-saving devices. Even a brief power outage can have severe consequences for patients, particularly those in critical care areas. Therefore, hospitals typically have their own backup power systems, which may include diesel generators, uninterruptible power supplies (UPS), or fuel oil generators. These systems ensure that hospitals can maintain operations during blackouts or disruptions to the main power grid.
An isolated power grid, also known as an isolated energy system, is a specific type of power distribution used in hospitals, particularly in critical care areas. This system is designed to protect patients and medical staff from the risks of electric shock due to leakage currents (micro shocks) that can occur during medical procedures. By utilising an isolation transformer, an isolated power grid can eliminate the neutral ground reference, allowing it to operate without grounding. As a result, the power supply to essential medical equipment is uninterrupted, even in the event of a ground fault.
Isolated power grids in hospitals are designed to prioritise the safety of patients and staff. In the event of a fault or failure, alarms do not indicate imminent danger. Medical procedures are allowed to continue without interruption to avoid additional risks to patients. Once the procedure is completed, hospital staff can then investigate the source of the failure, identify a solution, and ensure the equipment is functioning correctly for future procedures. This process, known as a Root-Cause check, typically takes less than 40 seconds to complete manually.
The isolated power grid's unique characteristics offer several advantages over traditional power systems. Unlike ordinary power setups, it does not rely on grounding for safety. Ordinary power systems employ methods such as Murray loop testing, Varley loop testing, or ground overlap testing. In contrast, isolated power grids utilise an online insulation monitor that constantly measures the line-to-ground impedance of isolated line conductors. This real-time monitoring provides crucial data for maintaining the integrity of the power supply.
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Frequently asked questions
If you are a PG&E customer, you can check your bill to see which of the 14 grid blocks you're on. If you are on "Block 50", you share a circuit with a hospital or fire station and are unlikely to be affected by rolling blackouts.
Hospitals are critical infrastructure and have a more urgent need for electricity than other institutions. They also use more power. Hospitals account for 2% of commercial floor space but consume 4.3% of the total delivered energy used.
A microgrid can supply a hospital with power when the surrounding grid goes down. It can also help hospitals achieve their sustainability goals and earn revenue by selling ancillary services to the grid.
An isolated power grid is a type of power distribution used in hospitals to protect patients and staff from the dangers of electric shock due to leakage currents during medical procedures.
Electrical problems in hospitals can be caused by a lack of proper maintenance, overloading of electrical systems, or problems with the external power grid.
