Last weekend on PBS Newshour, a two-part series called “Scotland is betting on tidal energy” was presented. Per the series, Scotland “is nearly 70% powered by renewable sources already, with the goal of reaching 100% by 2020, 10 years ahead of schedule.” Let that quote sink in a little – by 2020. Their focus has been on offshore wind energy, but the true wave of the future is tidal energy.
A project in the Pentland Firth is called MeyGen which includes three tidal wave turbines each with three thirty foot blades, the apparatus weighing 150 tons. The turbines provide a very predictable amount of energy powering over 1,000 homes each. “As the tide ebbs and flows, the turbines spin between 7 and 15 times a minute generating power to a wind turbine.”
Tim Cornelius, the CEO of SIMEC Atlantis said the tidal turbines have been expensive at first and have required half the cost to be subsidized by the Scottish government. But, he said the costs are coming down and after one year the cost of production is 50% of the year before. The turbines also build off existing technology used in the oil and gas energy, with cranes, ships and equipment to position a new turbine.
Scotland has been the leading edge implementer of these tidal turbines and others are taking notice. Cornelius says SIMEC plans to deploy 250 additional tidal turbines in the next several years. Other coastal countries are taking notice and creating their own pilots. The US is behind others, but will be investing in a testing facility off the Oregon coast.
As discovered with solar and onshore and offshore wind energy, the production costs decline over time so as to be more on par with fossils fuel production costs. But, in my view, when all costs are factored in – maintenance, litigation, environmental degradation, transportation, water loss and health – renewables are far cheaper than fossil fuel. For example, maintaining coal ash is a cost that never goes away.
While good things are happening with renewables in the US, we can all learn from countries like Scotland. We have a few cities like Burlington, VT, Georgetown, TX and Greensburg, KS which are 100% renewable energy powered. And, while California is a solar power and Texas a wind power champion, we have far more ways to go.
So, kudos to Scotland!