Microgrid, which is also known as distributed generation, is part of the overall Smart Grid technologies. It generates energy primarily using renewable sources like Solar, Wind, Biogas, and Fuel cells. The generated energy is supplied to the local area and may or may not be connected to the main grid depending on its Geo-location. It has all the function of the larger grid, generation, transmission, and distribution, but supplies energy to only limited area, hence it is called micro-grid. Nonetheless, it has variety of advantages over the larger grid; power loss over the transmission and distribution is very low as the generation is located closer to the consumption area, capital cost is low, can be implemented without any changes to local geography or demographic. Additionally, it reduces carbon emission and thus supports sustainable livelihood.
Echelon, which is one of the leading Smart Grid technology company, has deployed two microgirds one in India and another in South Africa. According to Echelon press release, "The model micro grid deployments are at Palm Meadows in Hyderabad, India, and Clearwater Mall in Johannesburg, South Africa. Palm Meadows is an 86-acre integrated gated community with 335 homes and residential services. Clearwater Mall in Johannesburg
is a retail building with more than 240 stores. Such micro grids are
likely to be a best practice in emerging countries grappling with
intermittent power supply, and are also applicable in environmentally
conscious countries that are aggressively incorporating renewable and
intermittent energy sources into the distribution network."
"Smart
micro grid an ideal way to integrate local generation at the
community level and allow for customer participation in the electricity
enterprise," said Michael Anderson,
senior vice president of Worldwide Markets for Echelon. "Micro grids sit
at the edge of the smart grid and provide real-time analysis, decision
making and control. The Palm Meadows and Clearwater Mall deployments are
great examples of how Echelon's commitment to leading the worldwide
transformation of the electricity grid into an energy control network
can foster market innovation. The concepts demonstrated in India and South Africa
can be replicated worldwide to improve power reliability and to
integrate energy efficiency solutions as well as renewable generation."
The Microgrid market is set to grow 164% between 2011 and 2017 with installed capacity increasing from 620 MW to 1.6 GW according to cleantech market intelligence firm Pike Research. There is growing interest across the world especially among educational, research, commercial, healthcare, and industrial campuses. The campus Microgrid market will reach upto $777 million by year 2017.
Palm Meadows, India
The Palm Meadows community ties into the grid at a dedicated
substation and sources energy in bulk from the utility. The community
also runs diesel generators and will incorporate solar generation in the
future. Residences within the community are equipped with Echelon smart
meters that connect into data concentrators at distribution
transformers and feed near real-time usage information to Echelon's Networked Energy Systems (NES)
system software. Echelon partner Grene Robotics' Skynet management
application automatically turns on local generation if utility-delivered
power is inadequate. The Skynet software interfaces with the NES system
software and creates a bill for the customer that reflects the
customers' actual use of lower cost grid power and more expensive
locally generated power. Customers have the option of reducing usage at
times when the more expensive energy is being supplied. The Palm Meadows
micro grid is providing reliable service even during frequent utility
grid outages and enabling the customer to make intelligent trade-offs
between comfort and cost.
"When you flip that light switch, turn your television on, or boot up your computer, you expect power," said Kiran Penmatcha,
CEO of Grene Robotics. "Like a national power grid, the Palm Meadows
micro grid manages generation, distribution, and the regulation of the
flow of electricity to its households. We are pleased to have helped
implement a proven, open and multi-application energy control
infrastructure that enables Palm Meadows to become distributors of
energy within their community. Today, the community is evaluating the
integration of solar generated electricity for the future. Tomorrow, the
community may look to add other applications, such as outdoor lighting
control on the same infrastructure."