POWER magazineJuly 1, 2019770
The pairing of wind and solar is emerging as a smart strategy to implement renewable energy sources with better economic feasibility.
The pairing of wind and solar power is an advantageous complement; the two benefit each other. The synergistic combination is an emerging trend in renewable energy and power generation as costs drop. The pairing of sustainable sources is in early stages, however. And the configuration still has challenges regarding return on investment (ROI), ease of implementation, and storage.
In western Minnesota, a 2-MW wind turbine and 500-kW solar installation—wind-solar hybrid project—is an early entrant to the wind-solar market and one of the first of its kind in the U.S. It was introduced at a cost of about $5 million with high expectations and the goal that Lake Region Electric Cooperative in Pelican Rapids would acquire the power for its 27,000 members.
The pioneering project got a boost amid the lower costs of solar. The power generation from both renewable sources is calculated to provide dividends on its investment.
According to market researcher Global Market Insights, hybrid solar-wind projects are expected to grow by 4% in the U.S. over the next five years to join a $1.5 billion global market. Some attribute the growth to the 2015 United Nations Climate Change Conference objectives, combined with lower costs of development and materials, and a keen interest by many nations to rely more on renewable energy sources. Because wind turbine power and solar both have excess capacity, together they offer far greater possibilities.
Renewables especially make economic sense in non-urban areas, where costs per kWh are higher, said Mike Voll, principal and sector lead for Smart Technologies at Stantec. “So, rural communities and remote locations, where energy prices often reach $0.40 to $0.45 per kilowatt-hour, actually see an ROI from these projects. When it comes to combining both wind and solar with storage, however, the list of locations is even smaller still. In a perfect world, we’d have a place that has excellent radiance with enough wind and low cloud cover, but the reality is there are very few locations that meet the geographic requirements. So even as the price continues to drop, there will still be significant limitations to pairing solar and wind.”
Despite limitations, renewables can work well in locations where everything clicks. A storage option is an essential component. “Adding energy storage can reduce intermittency of output, reshape the generation profile to match to load, and enable dispatch of the renewable energy to maximize revenue generation through ISO market participation or utility programs,” said Todd Tolliver, senior manager at ICF, a global consulting and technology services company headquartered in Fairfax, Virginia.
Tolliver said the economic viability of these systems is constrained by equipment, costs of storage, and limited or irregular revenue streams. But he explained that the most common combination today is solar plus battery storage, thanks to investment tax credit and incentive programs in certain markets that provide clear lower costs and better revenue streams. Still, wind power energy storage has challenge.
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