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Utilities Battle Homeowners Over Solar Power
HughPickens.com writes Diane Cardwell reports in the NYT that many utilities are trying desperately to stem the rise of solar power, either by reducing incentives, adding steep fees or effectively pushing home solar companies out of the market. The economic threat has electric companies on edge. Over all, demand for electricity is softening while home solar is rapidly spreading across the country. There are now about 600,000 installed systems, and the number is expected to reach 3.3 million by 2020, according to the Solar Energy Industries Association. In Hawaii, the current battle began in 2013, when Hawaiian Electric started barring installations of residential solar systems in certain areas. It was an abrupt move — a panicked one, critics say — made after the utility became alarmed by the technical and financial challenges of all those homes suddenly making their own electricity. "Hawaii is a postcard from the future," says Adam Browning, executive director of Vote Solar, a policy and advocacy group based in California.
But utilities say that solar-generated electricity flowing out of houses and into a power grid designed to carry it in the other direction has caused unanticipated voltage fluctuations that can overload circuits, burn lines and lead to brownouts or blackouts. "At every different moment, we have to make sure that the amount of power we generate is equal to the amount of energy being used, and if we don't keep that balance things go unstable," says Colton Ching, vice president for energy delivery at Hawaiian Electric, pointing to the illuminated graphs and diagrams tracking energy production from wind and solar farms, as well as coal-fueled generators in the utility's main control room. But the rooftop systems are "essentially invisible to us," says Ching, "because they sit behind a customer's meter and we don't have a means to directly measure them." The utility wants to cut roughly in half the amount it pays customers for solar electricity they send back to the grid. "Hawaii's case is not isolated," says Massoud Amin. "When we push year-on-year 30 to 40 percent growth in this market, with the number of installations doubling, quickly — every two years or so — there's going to be problems."
But utilities say that solar-generated electricity flowing out of houses and into a power grid designed to carry it in the other direction has caused unanticipated voltage fluctuations that can overload circuits, burn lines and lead to brownouts or blackouts. "At every different moment, we have to make sure that the amount of power we generate is equal to the amount of energy being used, and if we don't keep that balance things go unstable," says Colton Ching, vice president for energy delivery at Hawaiian Electric, pointing to the illuminated graphs and diagrams tracking energy production from wind and solar farms, as well as coal-fueled generators in the utility's main control room. But the rooftop systems are "essentially invisible to us," says Ching, "because they sit behind a customer's meter and we don't have a means to directly measure them." The utility wants to cut roughly in half the amount it pays customers for solar electricity they send back to the grid. "Hawaii's case is not isolated," says Massoud Amin. "When we push year-on-year 30 to 40 percent growth in this market, with the number of installations doubling, quickly — every two years or so — there's going to be problems."
The power companies are all moving towards "smart meter" technologies anyway. Why not make sure they've put one in that can monitor the output of a PV solar (or even a wind turbine) installation while they're at it?
For that matter, it seems perfectly reasonable to require the homeowner to install such a meter as part of a solar installation, as a condition of being able to sell power to the utility -- or even to push power into the grid at all.
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The problem is not that the meters can't measure the power in both directions. The problem is the latency the communication network on the meters can deliver the information to the control room. Smart Meters typically send home a simple KWH "energy" import/export number every so often for the purposes of billing. What systems engineers in control rooms need is real time access to the instantaneous power being generated by roof top solar systems. Their meter reading infrastructure is not designed for this kind of response.
Now all of a sudden meter paradigms change from a billing information collection program to a Power Quality program. Its a different system with different requirements.
It gets even more complex because you have lots of coops that do not generate power but only transmit it. How in the world do they get that information to the person they are buying power from at any given moment?
Its a HUGE issue that is not simply the evil power company wanting to stick it to the little guy. The Power companies have a big responsibility to keeping the grid stable. We take for granted the complexities involved to make stable 60hz ac power.