Delusional nonsence.
There are frequent period's where renewables don't provide enough supply to meet the 'demand' that such tariffs would require and we don't have any real storage of note to even out demand on a daily basis let alone a seasonal one.
'Renewable' tariffs should be much more expensive than they currently are and more expensive than 'non renewable' tariffs to cover the extra costs of having non renewable power sources needed in reserve to cover the voids where renewables aren't cutting it and to cover for the extra expenses of load balancing with such an intermittent power source.
As it currently stands 'renewable' tariffs are a way for power companies to upsell the same commodity to guilble consumers much the same as when the coffee companies sell you a 'fair-trade' coffee and keep almost all of the extra money they charge you for the pleasure.
At best a 'renewable' tariff means that, averaged over a year or so, that the energy used is covered by renewable sources somewhere but as we can't store energy when there's too much of it it's not just a case of the same % of renewable energy being in the grid with the rest of the energy at any time all mixed together.