"Historically the Site accommodated a 1,875 MW Combined Cycle Gas Turbine power station (the former Teesside Power Station) with the ability to generate steam for utilisation within the wider Wilton International site. The Teesside Power Station ceased generation in 2013 and was demolished between 2013 and 2015."
https://en.wikipedia.org/wiki/Teesside_power_station
https://www.tccpp.co.uk/pdfs/changeConsultationDocuments/NMC...
Yeah, that's disappointing. But development consent approval doesn't necessarily mean they will be built. There are some other CCGT projects that have been approved for a number of years, but construction hasn't started because the economics don't stack up right now.
With the cancellation of several nuclear plants, others being retired over the next 5-15 years, and the ban on coal by 2025, there may indeed be a future deficit of gas generation capacity. It may be that these projects are being developed speculatively in anticipation of that.
Just a random google gave this: https://www.smart-energy.com/industry-sectors/business-finan...
But I have no numbers to compare £700 million (possible times 3) with wind/solar investment for 2019.