Historically, wind power has raised costs of electricity slightly. In 2015, it was estimated that the use of wind power in the UK had added £18 to the average yearly electricity bill. This was the additional cost to consumers of using wind to generate about 9.3% of the annual total (see table below) – about £2 for each 1%. Offshore wind power has been significantly more expensive than onshore, which raised costs. Offshore wind projects completed in 2012–14 had a levelised cost of electricity of £131/MWh compared to a wholesale price of £40–50/MWh. In 2016, wind power first surpassed coal in UK electricity generation, and in the first quarter of 2018 surpassed nuclear power generation for the first time. In 2016 it was predicted that onshore wind power would have the lowest levelised cost of electricity in the United Kingdom in 2020 when a carbon cost was applied to generating technologies. However, in 2019, a strike price was agreed during the latest CfD round for £39.65/MWh for offshore wind projects, which is lower than the expected UK wholesale electricity price even without carbon pricing, meaning that this will be the first "negative subsidy" wind farm operating in the UK. In 2017 the Financial Times reported that new offshore wind prices had fallen by nearly a third over four years, to an average of £97/MWh, meeting the government's £100/MWh target four years early. Later in 2017 two offshore wind farm bids were made at a strike price of £57.50/MWh for construction by 2022–23. In the 2019 Contracts for Difference round, about 6GW of clean energy is to be added to the grid by 2025 at around £47/MWh at 2019 prices; the first round that prices were lower than current generation costs.