At Big Bend, less coal and more solar on Tampa Bay

I. What actually changed at Big Bend

Big Bend historically ran four coal-fired units, each on the order of a few hundred megawatts, per federal plant records. Under a project TECO called the Big Bend Modernization, the utility rebuilt one unit as a combined-cycle gas plant (one that burns natural gas to spin a turbine, then captures the leftover heat to drive a second turbine). An older coal unit was retired, and the remaining coal capacity has been scaled back. The exact in-service dates and unit numbers are worth checking against U.S. Energy Information Administration (EIA) plant data rather than taking from memory.

The short version: the plant still stands, still runs, and still matters to Tampa Bay's grid, but it burns less coal than it used to. If you want to watch the fuel mix shift for yourself, EIA publishes generation by plant and fuel, and TECO's own modernization page describes the gas conversion. The figures there will be more current than anything summarized at this desk.

II. The solar that is filling in

Alongside the Big Bend changes, TECO has been building solar across its service territory under a multi-year solar expansion program, reaching roughly 1,250 megawatts of utility-scale solar at last public report, spread across a dozen or so sites from Hillsborough County into Polk, per the utility's project list. That is nameplate capacity, the most a panel field can produce in full midday sun, not what it delivers around the clock.

Here is the honest limit: solar in Florida is a daytime resource, strongest in the hours around noon and gone by evening. It displaces fuel while the sun is up, which can ease the fuel portion of your bill, but it does not by itself cover the evening peak when households switch on air conditioning and lights. That gap is why the gas units and a growing amount of battery storage still matter, and why 'replacing coal with solar' is really 'replacing coal with gas plus solar plus storage.'

III. Who pays for the switch

New plants and solar fields are capital, and in Florida regulated utilities recover capital from ratepayers through the Florida Public Service Commission (FPSC), the state board that sets what TECO can charge. Fuel is handled separately, through an annual fuel cost recovery process where the commission trues up what customers paid against what fuel actually cost. Solar carries no fuel bill, so more of it can soften that line over time, while the plants themselves land on the base-rate side.

Whether the net effect is a saving or an increase depends on fuel prices, how much the buildout cost, and how the FPSC splits those costs, and reasonable people read the same filings differently. The checkable move is to read TECO's rate filings at the FPSC and its solar and electric-vehicle program pages, rather than trusting any single summary, including this one.

IV. Worth watching this month

1. Watch the FPSC docket page for any new Tampa Electric rate or storm-protection filings, which set what you pay and are public as soon as they land.

2. Check EIA's plant-level data for Big Bend when the next monthly generation figures post, to see coal, gas, and solar shares move in near real time.

3. Follow TECO's solar project list for any newly energized sites, noting that in-service dates slip and the page is the most current source.

4. Keep an eye on NOAA's National Hurricane Center through the tail of hurricane season, since a storm track toward Tampa Bay is what tests any hardening work on the coast.

5. Routine but worth a glance: TECO's annual fuel cost recovery filing at the FPSC, which adjusts the fuel line on next year's bills.

Did my coal plant close?

No. One Big Bend coal unit was retired and another was converted to natural gas, while the rest scaled back. You can confirm the current fuel mix in EIA's plant data.

Will more solar lower my bill?

It can ease the fuel part of the bill because solar has no fuel cost, but the plants and panels show up as capital on the base-rate side. The net effect depends on fuel prices and how the FPSC splits the costs, so read the rate filings.

What covers the grid at night?

Mostly natural gas now, with a growing amount of battery storage. Solar does almost nothing after sunset, which is why gas and storage still carry the evening peak.

Is Big Bend hardened for hurricanes?

It sits on Tampa Bay at Apollo Beach, so coastal storms are a real risk, and utilities file storm-protection plans with the FPSC. Whether specific hardening work holds is best judged against those filings and NOAA storm tracks, not assumed.